Policy Forum
Point-of-Care Testing for Infectious Diseases: Diversity,
Complexity, and Barriers in Low- And Middle-Income
Countries
Nitika Pant Pai1, Caroline Vadnais2, Claudia Denkinger2,3, Nora Engel4, Madhukar Pai2,5*
1 Division of Clinical Epidemiology, Department of Medicine, McGill University, Montreal, Canada, 2 Respiratory Epidemiology & Clinical Research Unit, Montreal Chest
Institute, Montreal, Canada, 3 Division of Infectious Diseases, Beth Israel Deaconess Medical Center, Boston, Massachusetts, United States of America, 4 Department of
Health, Ethics and Society/Caphri, Faculty of Health, Medicine and Life Sciences, Maastricht University, The Netherlands, 5 Department of Epidemiology & Biostatistics,
McGill University, Montreal, Canada
The Promise of Point-of-Care
Testing
Point-of-care (POC) tests have the
potential to improve the management of
infectious diseases, especially in resourcelimited settings where health care infrastructure is weak, and access to quality and
timely medical care is a challenge [1,2].
These tests offer rapid results, allowing for
timely initiation of appropriate therapy,
and/or facilitation of linkages to care and
referral. Most importantly, POC tests can
be simple enough to be used at the
primary care level and in remote settings
with no laboratory infrastructure. POC
tests can potentially empower patients to
self-test in the privacy of their homes,
especially for stigmatized diseases such as
HIV [3]. In fact, home-based, over-thecounter HIV testing was approved in July
2012 by the Food and Drug Administration in the United States [4].
Several agencies, notably, the Bill &
Melinda Gates Foundation and Grand
Challenges Canada, have recently announced grants for the development of
new POC diagnostics for global health.
Several million dollars are being invested
in this area, and substantial enthusiasm
and hope are increasing around POC
diagnostics. Efforts are also underway to
engage diagnostic and biotech companies
in emerging economies such as India and
China in developing new and affordable
diagnostics for TB and HIV [5]. Furthermore, donors such as UNITAID clearly
value the importance of good diagnostics
and are actively supporting projects on
TB, HIV, and malaria diagnostics [6].
The Policy Forum allows health policy makers
around the world to discuss challenges and
opportunities for improving health care in their
societies.
In this context, various stakeholders
need deeper insights into the challenges
for use and scale-up of POC testing, and a
framework for thinking about the diversity
of product profiles involved in POC
testing, including where and how POC
testing can be implemented successfully,
what barriers need to be overcome, and
what characteristics are necessary for
impact.
Diversity of Definitions and
Target Product Profiles within
POC Testing
According to one textbook, point-ofcare testing (POCT) can be defined as the
‘‘provision of a test when the result will be
used to make a decision and to take
appropriate action, which will lead to an
improved health outcome’’ [7]. Another
definition is: ‘‘patient specimens assayed at
or near the patient with the assumption
that test results will be available instantly
or in a very short timeframe to assist
caregivers with immediate diagnosis and/
or clinical intervention’’ [8]. However,
there are dozens of definitions of POCT
and no accepted universal definition [9].
Regardless of the exact definition, we
believe that the most critical elements of
POCT are rapid turn-around and communication of results to guide clinical
decisions and completion of testing and
follow-up action in the same clinical
encounter [10–12].
Rapid turn-around of results is critical
for the test results to impact clinical
management (e.g., triage, referral, treatment decisions, decision to discharge, etc.).
Indeed, without a clear link to a treatment
or counseling plan, test results, even if
rapid, are unlikely to have an impact [13].
‘‘Rapid’’ can range from within seconds,
to minutes, to a few hours (‘‘while the
patient waits’’). At the least, results ‘‘on the
same day’’ can still help disposition of
clients with a clear plan (e.g., initiation of
anti-tuberculosis or anti-retroviral therapy). Convenience to patients and care
providers mainly derives from the fact that
the POC diagnostic process is completed
‘‘in the same clinical encounter,’’ as
compared to conventional testing where
clients/patients may not come back for
testing or go far away (or wait long) for
testing. One of the biggest concerns about
conventional laboratory-based testing is
Citation: Pai NP, Vadnais C, Denkinger C, Engel N, Pai M (2012) Point-of-Care Testing for Infectious Diseases:
Diversity, Complexity, and Barriers in Low- And Middle-Income Countries. PLoS Med 9(9): e1001306.
doi:10.1371/journal.pmed.1001306
Published September 4, 2012
Copyright: ß 2012 Pai et al. This is an open-access article distributed under the terms of the Creative
Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium,
provided the original author and source are credited.
Funding: NPP and MP are supported by the Bill & Melinda Gates Foundation (grant OPP1061487), Grand
Challenges Canada (Canadian Rising Stars in Global Health grants) and Canadian Institutes of Health Research
(grants MOP-89918 & HBF-103210). MP is also supported by the European and Developing Countries Clinical
Trials Partnership (EDCTP - TBNEAT grant) and the Fonds de recherche du Québec – Santé (FRQS). The funders
had no role in the analysis of data and decision to publish.
Competing Interests: No financial or industry conflicts. MP serves as a consultant for the Bill & Melinda Gates
Foundation. BMGF had no involvement in this manuscript. NPP is an Academic Editor with PLOS ONE. MP is on the
editorial boards of PLOS ONE and PLOS Medicine. The other authors have declared that no competing interests exist.
* E-mail: madhukar.pai@mcgill.ca
Provenance: Not commissioned; externally peer reviewed.
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September 2012 | Volume 9 | Issue 9 | e1001306
Summary Points
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Enthusiasm and hope are increasing around point-of-care (POC) diagnostics for
diseases of global health importance.
The mere availability of rapid or simple tests does not automatically ensure
their adoption or scale-up. A range of barriers prevent the successful use of POC
testing—economic, regulatory, and policy-related, as well as user/provider
perceptions and cultural barriers.
Technology as such does not define a POC test. Rather, it is the successful use at
the POC that defines a diagnostic process as POC testing. Thus, the focus must
be on POC testing programs, rather than POC technologies.
We discuss a framework that envisions POC testing as a spectrum of
technologies (simplest to more sophisticated), users (lay persons to highly
trained), and settings (homes, communities, clinics, peripheral laboratories, and
hospitals).
A deeper appreciation of this diversity in target product profiles, and likely
barriers in each setting, might help test developers and public health managers
to identify the most impactful product and delivery model.
the long turn-around times and delays,
and the resultant loss of patients from the
testing and treatment pathway. This is, for
example, a well-recognized concern with
conventional sputum smear microscopy
for tuberculosis (TB) [14], and laboratorybased CD4 and viral load testing for HIV
[15].
We suggest that the technology as such
does not define a POC test nor determine
its use at the POC. Rather, it is the
successful use at the POC that defines a
diagnostic process as POC testing. So, it
may be best to think of POC testing
programs, rather than POC tests. It is how
the tests are deployed or implemented in a
health system that defines a POC testing
program. For example, one could implement a rapid diagnostic test (RDT) or
dipstick in a reference laboratory, and that
will not be a POCT program. Indeed,
laboratories in resource-limited countries
often use RDTs, but results are often
delivered after days. On the other hand,
one could implement a molecular test in
an out-patient clinic and successfully allow
POC usage. The Xpert MTB/RIF test
based on GeneXpert technology (Cepheid
Inc) is one such technology that can
potentially be implemented in TB clinic
settings and peripheral laboratories [12].
Thus, systems for rapid reporting of test
results to care providers, and a mechanism
to link test results to appropriate counseling and treatment are as important as the
technology itself. If systems for reporting
the results and follow-up care are not in
place, then POC testing is unlikely to have
an impact on clinical or public health
outcomes [13]. Also, POCT programs
require viable business models to ensure
that they are sustainable in the real world
and will actually get used. This means
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POC testing must fit within real-world
workflow patterns and economic/incentive structures.
It is widely believed that POC tests
should be equipment free, simple RDTs
(that is, those that meet the ‘‘ASSURED’’
criteria: affordable, sensitive, specific, user
friendly, rapid and robust, equipment-free,
and delivered [2]) and always be done
outside of laboratories and hospitals by
non-laboratorians. Such criteria were
probably necessary when RDTs were
introduced, but in today’s context, they
impose artificial restrictions on the concept
of POCT. POC testing done at the point
of clinical contact is preferable but not
required, so long as a system is in place for
rapid reporting of results that can inform
clinical decisions. For example, testing at a
peripheral laboratory attached to (or near)
a clinic or hospital can still allow for
POCT. Such POC testing can be done by
hospital staff in emergency rooms, operating rooms, intensive care units, and labour
wards, without waiting for results to come
from laboratories, and this means POCT
can also occur in hospital settings [16].
Indeed, there are successful examples of
POC testing by non-laboratorians in
hospital-based settings such as emergency
rooms (e.g., rapid influenza testing [17])
and labour wards (e.g., rapid HIV testing
to reduce mother-to-child transmission
[18]).
Also, restricting POCT to really cheap
and equipment-free tests (e.g., RDTs—
also called ‘‘first-generation POC tests’’)
imposes barriers for use of newer technologies such as cartridge-based POC nucleic
acid amplification tests (NAATs; ‘‘secondgeneration POC tests’’) and hand-held
devices such as mobile phone-based technologies (‘‘third-generation POCTs’’) [19].
2
These newer POCTs may not be as cheap
and equipment free as RDTs and dipsticks, but may prove to be very impactful
and cost-effective in the right context [20].
Thus, we propose that it is easier to
think of POC testing as a spectrum of
technologies (simplest to more sophisticated), users (lay persons to highly trained),
and settings (homes to hospitals). This
diversity of target product profiles (TPPs)
within POCT is illustrated in Figure 1.
This framework shows that POCT can be
done in at least five distinct settings: homes
(TPP1), communities (TPP2), clinics
(TPP3), peripheral laboratories (TPP4),
and hospitals (TPP5). Unique barriers
may operate at each level, and prevent
the adoption and use of POCTs. As shown
in the schematic, there are several examples of POC tests in each of these settings.
The relative importance of these settings
may vary by country, and also within a
country, where there may be important
differences in public versus private sectors,
and rural versus urban areas.
In the framework that we propose
(Figure 1), the type of device does not
define a POC test. As mentioned, POC
tests can range from the simplest dipsticks
to sophisticated automated molecular
tests, portable analysers, and imaging
systems. The same lateral flow assay, for
example, could be used across all TPPs.
Hence, the device does not automatically
define the TPP, although some types of
devices will immediately rule out some
TPPs or users. For example, conventional
ELISA cannot be performed by lower
level health workers or even doctors.
Microscopy is another technology that
requires a trained user and quality assurance mechanism—this restricts the technology to laboratories and hospitals. In
general, even the simplest molecular tests
require basic infrastructure such as power
supply and temperature control, and are
therefore unlikely to be used in TPP1–
TPP3 in resource-limited countries.
Also, the end-user of the test does not
automatically define a POC test. The
same device (e.g., lateral flow assay), can
be performed by several users across the
TPPs—from untrained (lay) people, to
community health workers, to nurses, to
doctors, and laboratory technicians. Rapid
oral-fluid–based HIV tests are a good
example of such a test [9], because it
now spans the entire spectrum—from inhome testing to hospital-based testing. So,
the actual user does not immediately
identify the TPP, although targeting the
end-user helps narrow down the type of
TPP needed (e.g., lay person or lower level
health worker necessarily means the sim-
September 2012 | Volume 9 | Issue 9 | e1001306
Figure 1. Diversity of target product profiles, users, and settings within the spectrum of POC testing. HBV, hepatitis B virus; HCV,
hepatitis C virus; UTI, urinary tract infection; MRSA, methicillin-resistant staphylococcus aureus; C. diff, clostridium difficile; RDT, rapid diagnostic test;
Strep A, group A streptococcus.
doi:10.1371/journal.pmed.1001306.g001
plest type of device and the most robust
design). For example, in-home testing for
HIV demands the simplest type of device,
along the lines of a pregnancy test, and
may also require telephonic counseling
and support services [4,21,22].
Depending on the end-user and the
actual setting, the purpose of POC testing
may vary—from triage and referral, to
diagnosis, treatment, and monitoring.
Some POC test users may not be empowered to prescribe medicines, while others
can use POCT results for treatment. This
has implications for test developers. A test
that is intended for triage and referral can
have different accuracy (e.g., lower specificity), compared to a test that is used to
make treatment decisions [23].
The Need to Understand
Barriers for POC Testing
The best POCT will not have any
impact unless it is widely used and
followed-up with appropriate treatment
interventions [24]. The mere availability
of rapid or simple tests does not automatically ensure their adoption or scale-up
[24]. This observation is evident from the
global experience with rapid HIV tests
and malaria RDTs [5,25–28]. In India, for
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example, simple RDTs are available for a
variety of diseases (e.g., HIV, malaria,
dengue, syphilis, hepatitis), are quite
inexpensive (US$1 per test or less), and
some meet all the ASSURED criteria.
However, these RDTs are often not used
in community or clinic settings to make
clinical decisions (with the possible exception of pregnancy tests and possibly HIV
and malaria RDTs). It appears that very
little POCT occurs in homes, communities, or clinics (TPP1–TPP3). Testing
predominantly takes place in laboratories
and hospitals (TPP4 and TPP5). In fact,
small, stand-alone laboratories are the
biggest consumers of RDTs.
What are the most important barriers to
widespread use of POCT at lower levels of
the health care delivery system, where we
hope POC testing will reduce diagnostic
delays and interrupt transmission? On the
basis of our observations and the published
literature [2,11,26–30], we believe there
are a variety of barriers to successful use of
POCT—from economic, regulatory, and
policy-related barriers to user/provider
perceptions and cultural barriers. Table 1
provides illustrative examples of these
barriers. Some barriers are generic, while
others are restricted to a specific TPP or
setting. Barriers for POC testing may
3
depend on the country, and may also
differ across public versus private, and
urban versus rural settings. In addition,
some barriers may be disease-specific,
while others will apply to all types of tests.
For example, stigma and confidentiality
may be important barriers for HIV testing
[26,28,31], while they may be less relevant
with malaria or dengue testing.
Why Do We Need to
Understand the Diagnostic
Ecosystem in Countries?
It is particularly important to look
beyond the technology, and understand
current diagnostic practices and the health
systems within which POC testing has to
get scaled up. At the country level, POC
diagnostics ultimately need to be integrated within health systems, supported by
financing (who will pay and how much?),
incentives (do various stakeholders benefit
from the economics?), training and information and communications technology
(ICT). These other factors (‘‘the business
model’’) may be as important as the
POCT itself and need to be taken into
account when developing tests [32].
Indeed, the best POCT without a good
business model is unlikely to get scaled up,
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Table 1. Barriers to adoption and scale-up of POC technologies.
Barrier for POCT
Example
Economic
It may be more expensive to place test instruments at the POC, as compared to laboratories. Some POCTs may
be priced at a level that is unaffordable in many countries. Private care providers may receive incentives from
laboratories for each test that they order; this means they can earn more by sending their patients to labs
rather than do any POC testing.
Policy-related
Existing guidelines and policy documents may not provide clear recommendations on how to include POC
tests in algorithms that are in place. Lack of a strong evidence-base on POCTs can result in weak evidence and
uncertain policy recommendations.
Regulatory
Poor regulation of diagnostics may result in easy availability of suboptimal and poor quality rapid tests on the
market; this makes it challenging to scale up validated POCTs.
Laboratory capacity
Some POCTs may require peripheral labs with sufficient capacity to run them (e.g., nucleic acid amplification
tests). Poor laboratory capacity poses a barrier for scale-up of such technologies.
Infrastructure
Clinics and primary care centers often lack infrastructure such as constant power supply, refrigerators, storage
space, waste disposal units, phlebotomy supplies, and temperature control; this makes it hard to implement
some types of POCTs.
Quality control and quality assurance
Even simple POC tests require quality assurance and training before they can be performed. Primary care
providers may not have the expertise or training to do them with quality assurance.
Work-flow balance
Staff shortages and high workload may reduce uptake of POCT. Health care providers are overburdened with a
high volume of patients, and work-flow and time constraints do not permit easy use of POC tests.
Training
Unqualified and informal care providers may lack the knowledge and training needed to implement even
simple RDTs. Erroneous results then erode the health system’s faith in POCT. Lack of continuous, ongoing
proficiency training can result in diminishing performance of POCT programs.
Supply chain
Supply chain deficiencies can lead to suboptimal or poor quality POC tests, which, in turn, may discredit POCT.
Infection risk
Health providers may be unwilling to do tests that may expose health care workers to the risk of infection.
Administrative/operational
It is not easy for health providers to seek reimbursement from insurance providers and third-party payers when
POC tests are used in community or home settings.
Technical/medical
Doctors and front-line care providers in some settings may prefer clinical diagnosis and empiric treatment over
diagnostic certainty. Widespread empiric treatment of common diseases reduces the felt need for any testing,
POCT or otherwise.
Awareness
Health workers and care providers may not be aware of the various tests that are now available for POC use.
Thus, they may still refer their patients to laboratories for testing.
Health system-related
Laboratory professionals in hospitals and larger health care facilities are opposed about any testing that is
done outside of lab settings. They fear this will impact their own business, and they also worry about
relinquishing control over testing.
Fit with user needs
Available rapid tests are often single disease focused when primary care providers are more worried about
syndromes of unknown etiology (e.g., febrile illness, chronic cough). So, available tests may not quite meet
user needs.
Cultural/societal
Perceived lack of confidentiality and stigma may reduce acceptance of POC testing in the community (e.g., HIV
rapid tests).
doi:10.1371/journal.pmed.1001306.t001
while, paradoxically, inaccurate tests can
become popular because of economic
reasons, as illustrated by the apparent
market success of inaccurate TB serological tests in many developing countries
[33,34]. In India, we have shown that
although serological TB tests are inaccurate, various players along the value chain
profit from their use, and this sustains a
market for these tests [34].
ICT, when combined with POC, can
help expand care to lower tiers of the
health care delivery system, all the way to
home-based, self-testing [30]. Thus, the
rapid expansion of mobile telephony
makes telephonic counseling and rapid
reporting of results (to patients as well as to
public health programs) feasible in many
settings. Diagnostic devices linked with
mobile phones can also allow for autoPLOS Medicine | www.plosmedicine.org
matic data capture, external quality assurance, and proficiency testing. Smart
phones can also provide decision support
to health workers on what follow-up action
is necessary after testing. Indeed, new
TPPs and business models are now
feasible, thanks to the rapid expansion of
ICT. Interestingly, the mobile phone itself
is becoming a POC testing device, and this
is a vibrant area for incentive prizes [35].
In India, the diagnostic ecosystem is
worrisome with systematic market failures
throughout the value chain for diagnostics—private doctors receiving payments
or incentives for tests ordered, overreliance on useless tests, and under-use of
good diagnostics [33,34,36–38]. There is
little quality assurance for laboratories in
India and private labs offer tests of
doubtful value. Laboratories in the public
4
health sector suffer from poor infrastructure and limited capacity, while dealing
with massive volumes. The regulatory
framework for in vitro diagnostics in India
is weak and most diagnostics do not
undergo rigorous validation before approval [34]. As a result a large number of
inaccurate and ineffective products can be
found on the market; many of these are
imported, but not approved by the US
Food and Drug Administration (FDA) or
other such credible regulatory bodies
outside of India [34]. In fact, the Government of India has recently banned TB
serological antibody tests, which are widely used in the private sector [34].
It is within this context that we need to
understand the barriers for use of POC
diagnostics in India. Based on our work in
India on TB and HIV diagnostics
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Table 2. Barriers for use of point-of-care tests in India.
Category
Potential Reasons Why POC Tests Are Not Being Used at the POC
Technical, administrative,
and operational
Widespread empiricism in clinical practice: Doctors and front-line care providers in India generally prefer
clinical diagnosis and empiric treatment (e.g., with broad spectrum antibiotics) over diagnostic certainty.
Work-flow, time constraints, and patient volume: Care providers are overburdened with a high volume of
patients, and because average consultation times last for just a few minutes, the work-flow and time constraints do
not permit POC testing. In the time it takes to do the POC test and read it, providers could see several waiting
patients and that is more important for their popularity and reputation.
Expertise and self-confidence: Care providers in India have a diversity of backgrounds—ranging from MBBStrained medical doctors, to unqualified providers, and those with training in alternative medicine. Thus, the ability
of these providers to do any clinical testing is highly variable. Unqualified practitioners and those with non-medical
backgrounds may lack the skills (or the confidence) to perform and interpret tests (even if they are simple to use).
Even MBBS doctors may not want to take on the responsibility of doing and interpreting test results.
Infrastructure and support staff: A large number of care providers in India practice medicine from small, singleroom clinics, with very little space for even a small side laboratory. They often practice alone with no support staff
(e.g., nurse). This makes it difficult to implement even simple lateral flow tests. Clinics often lack basic equipment
such as refrigerators, storage space, waste disposal units, phlebotomy supplies, temperature logs, etc.
Quality assurance training: Care providers may not have the expertise nor training to do testing with quality
assurance (e.g., run positive/negative controls).
Fit with user needs: Care providers manage several commonly encountered infections (e.g., TB, malaria, dengue,
and influenza), and it is not feasible for them to remember all the standard operating procedures of these tests, nor
is it possible for them to perform several rapid tests on the same patients to work through their differential
diagnoses.
Tests for multiple infections: Available rapid tests are often single disease focused (e.g., malaria RDTs) when
primary care providers are more worried about syndromes of unknown etiology (e.g., febrile illness, chronic cough,
diarrhea). In the absence of multiplexed POC tests for a panel of related infections, they find it hard to do multiple
POC tests at the POC.
Investments at the primary care provider level: At the level of the single primary care provider, there is
insufficient volume of each disease to make it worth their while to stock multiple RDTs. Also, care providers do not
like to make any capital investments, especially in small centers.
Reputation of POCTs: Easy availability of suboptimal and poor quality rapid tests in the market may have
resulted in lack of faith in them—care providers consider rapid tests to be inferior to conventional tests.
Health system-related
Awareness of POCTs: Doctors and care providers may not be aware of the various POC tests that are now
available for POC use.
Professional exclusivity: Laboratory professionals in hospitals and larger health care facilities are opposed to any
testing that is done outside of lab settings. They fear this will impact their own business, and they also worry about
relinquishing control over testing. Laboratory professions do not believe that doctors or health care workers can do
POC tests with quality assurance.
Monitoring and tracking outside of labs: Health care delivery systems struggle to audit and monitor the use of
POC tests in settings outside of the laboratory. In India, medical records are poorly managed in most settings.
Impact on hospital attached labs: Hospitals and medical establishments often have their own laboratories, and
to generate business for their labs, they prefer that doctors refer patients to these laboratories, instead of doing
testing by themselves.
Investment in post-test counselling: Health care systems may be unwilling to invest in counselors who can
provide post-test counseling services in clinic settings.
Weak capacity to absorb POC tests and insufficient treatment availability: Implementation of POCT might
increase workload and demand for treatment services. Limited resources (e.g., drugs) and human resources might
diminish enthusiasm for POCT.
Economic
Clinical relationship and exchange of money: The usual practice in India is for patients to pay someone else
(e.g., a secretary or nurse) rather than the doctor directly. If the doctor were to perform and read the POC test, it will
be awkward for them to take money from patients (unless support staff are involved).
Referral fees and incentives: Private care providers often receive referral fees (i.e., incentives) from laboratories
for each test that they order; this in turn greatly limits their financial incentive to directly conduct tests.
Patients’ willingness to pay: While patients may be willing to pay for tests done at a laboratory, they may be
unwilling to directly pay the doctor for testing costs, beyond the consultation fees that they are already paying.
Affordability of POCTs: Poor patients may not be able to afford any testing. They may instead prefer a
prescription for drugs (which may be less expensive and more easily available compared to tests).
Traceability for insurance reimbursements: It is not easy for health providers to seek reimbursement from
insurance providers and third-party payers when POC tests are used in office, community or home settings, with no
invoice getting generated for each test.
Bypass of medical consultation and diagnostic process: Patients seeking quick relief from symptoms may
directly buy over-the-counter antibiotics from pharmacies, and thereby completely bypass the medical consultation
process.
Mark-up on POCTs: Laboratories that offer POC tests may demand a high price for these tests, making them
unaffordable for poor patients.
doi:10.1371/journal.pmed.1001306.t002
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[3,18,29,33,34,36,37,39–43], we have
identified several potential barriers to
implementation of POC tests by primary
care providers (Table 2). Additional barriers may operate at the community level
in India. Much of the community-level
health care in India is done by village
health nurses, auxiliary nurse midwives,
and Accredited Social Health Activist
workers, under the National Rural Health
Mission. These workers are generally not
well trained or empowered to adequately
use POC tests or prescribe drugs on the
basis of test results (with some exceptions).
In fact, the medical lobby in India
vigorously prevents any move to empower
health workers to prescribe drugs. Furthermore, these community health workers are heavily burdened with paperwork
associated with maternal and child healthrelated programs and often do not have
the time to conduct any testing. Furthermore, the incidence of many diseases is
quite low at the community level, and this
might reduce the motivation and resources
for community-based testing.
In South Africa, discussions with TB/
HIV experts suggest that much of the POC
testing currently occurs in laboratories and
hospitals (TPP4 and TPP5). For example,
the scale-up of Xpert MTB/RIF in South
Africa is happening via the National Health
Laboratory Service (NHLS) network of
laboratories. At the clinic level (TPP3), tests
for infections like HIV, syphilis, and
malaria are widely used. At the community
level (TPP2), HIV rapid tests are the most
widely used POC tests. HIV self-testing is
known to happen at home in South Africa
(TPP1), especially among health care
workers who avoid conventional voluntary
counseling and testing (VCT) to protect
their confidentiality.
South African experts identified several
potential barriers for POCT in their
setting. For example, laboratory professions are concerned about widespread use
of POC tests for many reasons: (1) NHLS
cannot control or provide oversight to any
testing that is done outside of the NHLS
lab network; (2) it is not clear which
agency will accept ownership of a POC
testing program in South Africa—who will
conduct training, quality assurance, maintenance; (3) it is unclear who will provide
overall management of a decentralized
POC testing program at the level of
communities and clinics. Cost can also
be a major barrier for POCT—a recent
study from South Africa suggests that
placing the Xpert MTB/RIF test at the
POC will be substantially more expensive
than placing the instruments in the NHLS
laboratories [44].
Overcoming Barriers to POCT
Programs
POC testing holds a lot of promise, but
it is important to understand the complexity and diversity of POCT, and identify
the biggest barriers to successful implementation of POCT programs. This step
is critical for development and scale-up of
POCTs, because it will allow test developers and public health programs to target
the TPP that is most likely to succeed and
has the most impact.
The framework we have proposed may
have utility in shaping many of the
ongoing efforts to develop and deploy
POC tests for global health. Firstly, test
developers and manufacturers need to
understand the real-world context (e.g.,
conditions, settings, users, resources) within which tests need to get scaled up. Only
then can TPPs by test developers match
the TPPs required by public health
programs. Indeed, technologies may need
to be designed in resource-limited settings
(‘‘frugal or reverse innovation’’), from the
ground up, to ensure that they are robust,
field-tested in a variety of conditions, have
built-in capacity for reporting/notification, and appropriately priced. Secondly,
donors and funding agencies must consider the downstream implications of the
health technologies that they are funding,
and ensure that product development
initiatives are simultaneously coordinated
with pricing and delivery mechanisms,
supported by innovative business models
for scale-up. Lastly, health care managers
must invest in POCT programs, rather
than merely purchase rapid tests, and
ensure the mechanisms are put in place
for quality assurance, reporting of results,
notification of cases, and initiation of
action on the results of the tests. Only
then will the true benefits of POC testing
be realized.
Author Contributions
Wrote the first draft of the manuscript: NPP
MP. Contributed to the writing of the manuscript: CV CD NE. ICMJE criteria for
authorship read and met: NPP CV CD NE
MP. Agree with manuscript results and conclusions: NPP CV CD NE MP.
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