Antenatal Infection Screening: HIV, Syphilis, HBsAg & HCV

Antenatal infection screening infographic comparing HIV syphilis HBsAg hepatitis B and HCV rapid screening tests during pregnancy

Infection screening is an important part of antenatal care because some infections can affect maternal health, pregnancy outcomes or the health of the baby even when the pregnant woman has no obvious symptoms.

Among the infections considered during antenatal care, HIV, syphilis and hepatitis B have particular importance because effective testing and follow-up can help reduce the risk of transmission from mother to child. Hepatitis C (HCV) testing may also be relevant according to applicable clinical guidelines, healthcare setting, medical history and individual circumstances.

This guide explains what HIV, syphilis, HBsAg and HCV screening tests actually detect, why they are not interchangeable, what Reactive and Non-Reactive results mean, and why a rapid screening result should not automatically be treated as a final diagnosis.

What Is Antenatal Infection Screening?

Antenatal infection screening refers to tests performed during pregnancy to identify infections that may:

Affect the health of the pregnant woman
Influence pregnancy management
Be transmitted from mother to child during pregnancy, birth or the postnatal period
Require treatment, monitoring or preventive measures
Require additional testing or specialist evaluation

Screening is especially valuable because some infections may be present without noticeable symptoms.

However, screening and diagnosis are not always the same thing. The appropriate next step after a Reactive screening result depends on the infection, the marker detected, the particular test used and the applicable testing algorithm.

Which Infections Are Commonly Considered During Antenatal Screening?

The major infection-screening topics covered in this Microsidd Knowledge Hub are:

HIV
Syphilis
Hepatitis B, commonly screened using HBsAg
Hepatitis C, commonly initially screened using anti-HCV antibody testing where applicable

These infections are discussed together because they can all be relevant to maternal and infectious-disease care. However, they are four different infections, caused by different organisms and detected using different markers.

HIV, Syphilis and Hepatitis B: The Triple-Elimination Connection

The World Health Organization uses the term triple elimination for coordinated efforts to eliminate mother-to-child transmission of:

HIV
Syphilis
Hepatitis B virus (HBV)

This does not mean the three infections are medically identical. Instead, antenatal care provides an opportunity to identify all three early and connect pregnant women with the appropriate treatment, prevention and follow-up pathway.

WHO recommends testing pregnant women for HIV, syphilis and hepatitis B surface antigen (HBsAg) at least once and as early as possible, ideally at the first antenatal-care visit.

Where Does HCV Fit?

Hepatitis C should not simply be described as the fourth member of the WHO triple-elimination programme.

HCV screening during pregnancy is handled differently across healthcare systems and clinical guidelines. Testing may be recommended according to the applicable national or institutional protocol, medical history, risk factors and healthcare professional's assessment.

When HCV screening is performed, the initial screening test commonly looks for antibodies against hepatitis C virus — anti-HCV.

An anti-HCV Reactive result does not by itself prove that active hepatitis C virus is currently present in the blood. Additional testing, commonly involving detection of HCV RNA, is used to determine current infection.

We will cover this important distinction separately in:

HCV Antibody Reactive vs HCV RNA: What Is the Difference?

What Does Each Antenatal Infection Test Detect?

Screening Test	Infection	Common Marker Detected	Important Point
HIV rapid test	HIV	HIV antibodies and/or HIV antigen depending on the test	The exact marker depends on the HIV test generation and product.
Syphilis rapid test	Syphilis	Commonly antibodies against Treponema pallidum	A treponemal screening test and an RPR/VDRL test do not provide identical information.
HBsAg test	Hepatitis B	Hepatitis B surface antigen	HBsAg is an antigen marker, not an hepatitis B antibody test.
HCV rapid test	Hepatitis C	Commonly anti-HCV antibodies	A Reactive antibody result requires appropriate follow-up to determine current infection.

These four tests are not interchangeable. A result from one test provides no result for any of the other infections.

Why Is HIV Screening Important During Pregnancy?

HIV can be transmitted from a mother living with HIV to her child during pregnancy, childbirth or breastfeeding. Identifying HIV during pregnancy allows appropriate HIV care and treatment to begin or continue and enables measures intended to reduce vertical transmission.

India's National AIDS Control Organisation includes HIV testing of pregnant women as an important part of its programme for prevention and elimination of vertical transmission.

An HIV rapid test may detect:

HIV-1 antibodies
HIV-2 antibodies
Or, with certain tests, a combination of HIV antibodies and an HIV antigen such as p24

The exact marker depends on the test being used.

Does a Reactive HIV Rapid Test Confirm HIV?

No single Reactive screening result should automatically be described as a confirmed HIV diagnosis.

HIV diagnosis must follow the applicable national testing strategy and confirmatory algorithm. Screening and confirmation are distinct steps.

This will be covered in depth in the dedicated Microsidd HIV cluster:

Why Is Syphilis Screening Important During Pregnancy?

Syphilis is caused by the bacterium Treponema pallidum. Maternal syphilis can affect pregnancy and can be transmitted to the developing baby, potentially resulting in congenital syphilis and other serious pregnancy or neonatal complications.

Early detection is therefore particularly important during antenatal care.

Rapid syphilis tests commonly used for screening detect treponemal antibodies.

Is a Syphilis Rapid Test the Same as an RPR Test?

No.

A rapid treponemal test and a non-treponemal test such as RPR or VDRL assess different types of serological response.

A person may therefore require an appropriate combination of tests depending on the testing algorithm, previous treatment history and clinical circumstances.

This distinction is important enough to have its own guide:

Syphilis Rapid Test vs RPR: What Is the Difference?

Why Is HBsAg Screening Important During Pregnancy?

HBsAg means hepatitis B surface antigen.

Testing for HBsAg helps identify people who may have current hepatitis B virus infection. During pregnancy, identifying maternal HBV infection is particularly important because hepatitis B can be transmitted to the baby around the time of birth.

When HBsAg is detected, healthcare professionals can arrange further assessment and plan appropriate maternal and newborn management.

Is HBsAg an Antibody Test?

No.

This distinction is important.

HBsAg is an antigen associated with hepatitis B virus. It is different from hepatitis B antibody markers such as:

Anti-HBs
Anti-HBc

These markers provide different information and should not be confused with one another.

Continue to:

Why May HCV Screening Be Considered During Pregnancy?

Hepatitis C is caused by hepatitis C virus. It is primarily a blood-borne infection and can occasionally be transmitted from mother to child.

Where HCV screening is recommended, the initial test commonly detects anti-HCV antibodies.

What Does a Reactive HCV Antibody Result Mean?

A Reactive anti-HCV result indicates that hepatitis C antibodies have been detected.

It does not automatically distinguish between:

Current active HCV infection
Past infection that has cleared
Or, less commonly, a screening result that requires further clarification

Testing for HCV RNA is used to determine whether hepatitis C virus is currently detectable.

Related guides:

HIV vs Syphilis vs HBsAg vs HCV: Quick Comparison

Infection	Organism	Typical Rapid-Screening Marker	Is a Reactive Rapid Test Always the Final Diagnosis?
HIV	Human immunodeficiency virus	HIV antibodies and/or antigen depending on test	No — follow the applicable HIV testing algorithm.
Syphilis	Treponema pallidum	Usually treponemal antibodies	No — interpretation may require additional testing and clinical history.
Hepatitis B	Hepatitis B virus	HBsAg	A Reactive screening result requires appropriate clinical evaluation and follow-up.
Hepatitis C	Hepatitis C virus	Usually anti-HCV antibodies	No — HCV RNA is used to establish current infection.

What Do Reactive, Non-Reactive and Invalid Mean?

Rapid screening-test terminology commonly includes:

Reactive

The test has detected the marker targeted by that particular screening assay.

Reactive does not automatically mean that every infection is definitively diagnosed from one rapid-test result. The required follow-up depends on the disease and testing algorithm.

Non-Reactive

The targeted marker was not detected by the test under the conditions in which it was performed.

A Non-Reactive result does not necessarily exclude infection in every situation. Important considerations may include:

How recently exposure occurred
Whether the marker had sufficient time to become detectable
The specimen used
Whether the procedure was performed correctly
The sensitivity and intended use of the particular test

Invalid

An Invalid result means the test cannot be interpreted reliably. The manufacturer's Instructions for Use should be followed regarding repeat testing and the circumstances that define an invalid result.

Why We Prefer “Reactive” Instead of “Positive” for Rapid Screening Tests

Using precise terminology helps prevent a screening result from being mistaken for a complete clinical diagnosis.

Throughout the Microsidd Infectious Disease Knowledge Hub, we will therefore generally use:

Reactive
Non-Reactive
Invalid

where those terms are appropriate for the specific rapid test.

The word confirmed will only be used where the relevant diagnostic testing pathway supports that conclusion.

Can One Rapid Test Screen for All Four Infections?

Not necessarily.

Individual rapid tests usually target one specific infection or marker. Combination or multiplex products also exist, but the exact markers detected depend entirely on the particular device.

For example, some combination rapid tests can screen for HIV and syphilis together, while newer multi-test approaches may combine additional markers.

The Instructions for Use of the exact product must always be checked rather than assuming that one cassette screens for every maternal infection.

Can Antenatal Infection Tests Be Performed at Home?

That depends on the intended use of the specific product.

Some rapid tests are designed for professional use in laboratories, hospitals or clinics. Some products may be specifically designed or approved for self-testing.

Do not assume that a test can be used at home simply because it is technically easy to perform.

Always check:

Manufacturer's intended use
Permitted specimen type
Sample quantity
Buffer requirement
Reading time
Interpretation criteria
Storage requirements
Applicable medical and regulatory guidance

Why Manufacturer Instructions Matter

Rapid tests can look very similar externally, but their procedures may differ substantially.

Two cassettes that appear almost identical may require different:

Specimen types
Blood volumes
Numbers of buffer drops
Waiting times
Interpretation windows
Storage conditions

For this reason, the Microsidd Knowledge Hub will not apply a generic rapid-test procedure to every product.

Our individual How to Use, Result Interpretation and Storage & Expiry guides will be based on the manufacturer-specific information for the exact kit discussed.

What Happens If an Antenatal Infection Screening Test Is Reactive?

The correct next step depends on which test is Reactive.

Reactive Screening Test	General Next Step
HIV	Follow the applicable national HIV testing and confirmation algorithm and obtain professional counselling and medical care.
Syphilis	Prompt professional evaluation and appropriate additional testing/treatment pathway.
HBsAg	Clinical assessment and further hepatitis B evaluation, including planning of maternal and newborn care where appropriate.
Anti-HCV	Further testing, generally including HCV RNA, to determine whether current HCV infection is present.

A Reactive antenatal infection screen should not be ignored, but it also should not be interpreted beyond what the particular screening test actually establishes.

Why Early Identification Matters

Early identification gives healthcare professionals more time to:

Confirm or clarify the screening result where necessary
Assess maternal health
Initiate appropriate treatment or monitoring
Plan pregnancy and delivery care
Implement measures intended to reduce vertical transmission
Plan appropriate newborn prevention, testing or follow-up

This is why infection screening is closely connected to the first antenatal visit.

If you have not already read the pregnancy-to-ANC bridge guide, continue here:

Pregnancy Confirmed? First Antenatal Visit & Important Screening Tests

Rapid Infection Screening Products at Microsidd

Microsidd supplies rapid diagnostic products for different infectious-disease screening applications. The exact intended use, specimen requirement and result interpretation must be checked on the individual product page and manufacturer documentation.

HIV Screening

Microsidd HIV 1 & HIV 2 Antibody Rapid Test Kit

This professional-use rapid IVD product is designed for qualitative HIV-1 and HIV-2 antibody screening. A Reactive screening result does not by itself establish an HIV diagnosis.

HBsAg / Hepatitis B Screening

Microsidd HBsAg Fast Test Kit Mono Pack

HBsAg testing is used to screen for hepatitis B surface antigen. HBsAg should not be confused with hepatitis B antibody testing.

HCV Screening

Microsidd HCV Rapid Test Kit

HCV rapid antibody screening should be understood as an initial screening step. A Reactive anti-HCV result requires appropriate follow-up to determine current infection.

Syphilis Screening

Syphilis Fast Test Kit Mono Pack

Syphilis rapid tests commonly detect antibodies associated with Treponema pallidum. Interpretation must follow the intended use of the specific assay and the appropriate clinical testing pathway.

Antenatal Infection Screening Pathway at a Glance

Pregnancy confirmed
↓
First antenatal assessment
↓
HIV + Syphilis + HBsAg screening as recommended in antenatal care
↓
HCV testing where applicable
↓
Reactive / Non-Reactive / Invalid result
↓
Appropriate disease-specific testing, treatment, prevention or follow-up pathway

Frequently Asked Questions

Which infection tests are important during pregnancy?

HIV, syphilis and hepatitis B screening have established roles in antenatal care and in efforts to prevent vertical transmission. HCV testing may also be recommended according to applicable guidelines, the healthcare setting and individual circumstances.

When should HIV, syphilis and HBsAg screening be performed during pregnancy?

These infections should generally be screened for early in pregnancy according to applicable antenatal guidelines, ideally as part of early antenatal care. Additional or repeat testing may be recommended in some situations.

Is HCV part of the WHO triple-elimination programme?

No. WHO's triple-elimination initiative specifically focuses on mother-to-child transmission of HIV, syphilis and hepatitis B. HCV remains an important blood-borne infection, but its pregnancy-screening recommendations should be considered according to the applicable clinical framework.

Does a Reactive HIV test mean HIV is confirmed?

No. A Reactive HIV screening result must be managed according to the applicable HIV testing algorithm. A single screening result should not automatically be described as a confirmed HIV diagnosis.

What does HBsAg Reactive mean?

It means hepatitis B surface antigen has been detected by the screening assay. The result requires appropriate clinical evaluation and further management according to the testing pathway.

Does an HCV antibody Reactive result mean someone currently has hepatitis C?

Not necessarily. Anti-HCV antibodies can remain detectable after previous infection. Additional testing, commonly HCV RNA testing, is used to determine whether current HCV infection is present.

Is a syphilis rapid test the same as RPR?

No. Rapid syphilis tests are commonly treponemal antibody tests, while RPR is a non-treponemal test. They serve different roles within syphilis testing and management.

Can a Non-Reactive result completely exclude a very recent infection?

Not always. Some infections have a period after exposure during which the target marker may not yet be detectable. The significance depends on the particular infection, test technology, timing and circumstances of exposure.

Can the same blood sample be used for every rapid test?

Do not assume so. Permitted specimen type, required sample volume and handling instructions vary by product. Follow the manufacturer-specific Instructions for Use for each kit.

Should a pregnant woman buy all four rapid tests and perform them herself?

Antenatal infection screening should be planned within appropriate antenatal care. Some rapid tests are intended only for professional use, while self-testing availability differs by product. The manufacturer's intended use and professional medical guidance should be followed.

Continue Through the Microsidd Maternal & Infectious Disease Rapid Testing Hub

Medical Information Notice

This article is intended for general educational information and does not replace antenatal consultation, medical diagnosis, laboratory testing or treatment from a qualified healthcare professional.

Rapid diagnostic tests should be used strictly according to the manufacturer's Instructions for Use and their stated intended use. Screening-test terminology and follow-up differ between HIV, syphilis, hepatitis B and hepatitis C. A Reactive screening result may require additional testing before a final diagnosis or clinical conclusion can be made.

Pregnant women with a Reactive infection-screening result, symptoms, a recent potential exposure or uncertainty regarding testing should seek appropriate professional medical evaluation.

Antenatal Infection Screening: HIV, Syphilis, Hepatitis B (HBsAg) & HCV