# HIV vs HBsAg vs HCV vs Syphilis Rapid Tests: What Does Each Test Detect? **By Dr Pramod kumar** · 2026-10-01 ## HIV, HBsAg, HCV & Syphilis Rapid Tests Are Not the Same Test HIV, hepatitis B, hepatitis C and syphilis rapid tests are often discussed together because they can appear in the same infectious-disease, laboratory or antenatal screening pathway. However, they do **not** detect the same biological marker. The simplest comparison is: **HIV → HIV antibodies, or antibodies + p24 antigen depending on the test** **HBsAg → Hepatitis B surface antigen** **HCV → Usually Anti-HCV antibodies** **Syphilis → Usually Treponemal antibodies** This distinction determines what a Reactive result means and what should happen next. **A Reactive result on one test tells you nothing about the results of the other three tests.** ## How Does This Connect to a Positive Pregnancy Test? For many people, these four tests first become familiar after pregnancy is confirmed. The journey can look like this: **Pregnancy suspected** ↓ **Urine hCG Pregnancy Test** ↓ **Pregnancy Test Positive** ↓ **First Antenatal Visit** ↓ **Appropriate Maternal Infection Screening** ↓ **HIV • HBsAg • Syphilis • HCV where applicable** A pregnancy test detects **hCG**. It does not screen for HIV, hepatitis B, hepatitis C or syphilis. If you reached this article after a positive pregnancy test, start with: - [**Pregnancy Test Positive? Understanding the Next Antenatal Tests: HIV, HBsAg, HCV & Syphilis**](/blogs/knowledge-hub/positive-pregnancy-hiv-hbsag-hcv-syphilis-tests) - [**Pregnancy Confirmed? First Antenatal Visit & Important Screening Tests**](/blogs/knowledge-hub/positive-pregnancy-first-antenatal-visit-tests) - [**Antenatal Infection Screening: HIV, Syphilis, Hepatitis B & HCV**](/blogs/knowledge-hub/antenatal-infection-screening-hiv-syphilis-hepatitis-b-hcv) ## HIV vs HBsAg vs HCV vs Syphilis: Quick Comparison Test Main Marker Detected Reactive Result Generally Means Important Next Step **HIV 3rd Generation** HIV-1 / HIV-2 antibodies HIV antibodies detected by the screening assay Follow applicable HIV diagnostic algorithm **HIV 4th Generation** HIV antibodies + HIV-1 p24 antigen One or more HIV screening markers detected Follow applicable HIV diagnostic algorithm **HBsAg** Hepatitis B surface antigen HBsAg detected; HBV infection requires appropriate evaluation HBV serology, clinical assessment and HBV DNA where indicated **HCV** Anti-HCV antibodies HCV antibodies detected; may represent current or previous infection HCV RNA to establish current infection **Syphilis** Treponemal antibodies Antibodies associated with _Treponema pallidum_ detected RPR/VDRL + history + applicable syphilis diagnostic pathway ## Antigen vs Antibody: Why the Difference Matters An **antigen** and an **antibody** are different biological markers. An antigen is a component associated with an infectious organism. An antibody is produced by the person's immune system in response to infection or exposure. This difference explains why some tests can remain Reactive even after the underlying infection has cleared or been treated. For example: - Anti-HCV antibodies commonly remain detectable after hepatitis C cure. - Treponemal syphilis antibodies commonly remain detectable after successful treatment. - HIV antibodies generally remain detectable despite successful viral suppression. - HBsAg is an antigen and behaves differently from these antibody markers. ## 1\. What Does an HIV Rapid Test Detect? The answer depends on which HIV test is being used. HIV testing technologies include: - Antibody tests - Antigen/antibody combination tests - Nucleic-acid tests Rapid screening products may use different technologies, so the exact product label and Instructions for Use must always be checked. ## What Does a 3rd Generation HIV Test Detect? Third-generation HIV screening tests are antibody based. The current [**Microsidd HIV 3rd Generation Test Kit**](/products/microsidd-hiv-3rd-generation-test-kit) is designed to detect: - HIV-1 antibodies - HIV-2 antibodies ## What Does a 4th Generation HIV Test Detect? Fourth-generation antigen/antibody tests combine: - HIV-1 / HIV-2 antibody detection - HIV-1 p24 antigen detection The [**Microsidd 4th Generation HIV Test Kit**](/products/4th-generation-hiv-test-kit) uses this antigen/antibody approach. p24 antigen can become detectable before the body's full antibody response has developed, which is why antigen/antibody testing can identify some infections earlier than antibody-only testing. ## Does One Reactive HIV Rapid Test Confirm HIV? **No.** A Reactive screening result means the marker targeted by the screening assay was detected. It should enter the applicable HIV diagnostic algorithm rather than being treated as a final diagnosis from one standalone screening cassette. In India, HIV diagnosis should follow the applicable national testing strategy and healthcare pathway. ## Continue Through the HIV Hub - [HIV Rapid Test Kit Complete Guide](/blogs/knowledge-hub/hiv-rapid-test-kit-complete-guide) - [HIV Rapid Test: Reactive vs Non-Reactive](/blogs/knowledge-hub/hiv-rapid-test-reactive-vs-non-reactive) - [HIV Screening Test vs Confirmatory Testing](/blogs/knowledge-hub/hiv-screening-vs-confirmatory-testing) - [HIV Testing During Pregnancy & Antenatal Care](/blogs/knowledge-hub/hiv-testing-during-pregnancy-antenatal-care) ## 2\. What Does an HBsAg Rapid Test Detect? **HBsAg** stands for: **Hepatitis B Surface Antigen.** It is a protein on the surface of hepatitis B virus. An HBsAg rapid test therefore detects an **antigen**, not an antibody. The [**Microsidd HBsAg Fast Test Kit Mono Pack**](/products/hbsag-fast-test-kit-mono-pack) is designed for initial HBsAg screening. ## What Does a Reactive HBsAg Result Mean? A Reactive HBsAg screening result means hepatitis B surface antigen was detected by the assay. HBsAg is an important marker of current hepatitis B virus infection. However, HBsAg alone does not provide the complete hepatitis B picture. ## What Other Hepatitis B Tests May Be Needed? Depending on the situation, hepatitis B evaluation may include: - Laboratory HBsAg - Anti-HBs - Total Anti-HBc - IgM Anti-HBc where acute infection is being considered - HBeAg / Anti-HBe where appropriate - HBV DNA - Liver-function assessment ## What Is the Hepatitis B Triple Panel? A widely used hepatitis B serological assessment combines: - **HBsAg** - **Anti-HBs** - **Total Anti-HBc** These markers provide more information than HBsAg alone and can help differentiate current infection, previous infection, immunity and susceptibility. ## Does Reactive HBsAg Automatically Mean Chronic Hepatitis B? **No.** HBsAg can be present in both acute and chronic HBV infection. A single Reactive result does not independently establish how long infection has been present. ## Continue Through the HBsAg / Hepatitis B Hub - [HBsAg Rapid Test Kit Complete Guide](/blogs/knowledge-hub/hbsag-rapid-test-kit-complete-guide) - [HBsAg Rapid Test: Reactive vs Non-Reactive](/blogs/knowledge-hub/hbsag-reactive-vs-non-reactive) - [HBsAg Reactive Result: What It Means & What Happens Next](/blogs/knowledge-hub/hbsag-reactive-result-what-it-means) - [Hepatitis B / HBsAg Screening During Pregnancy](/blogs/knowledge-hub/hepatitis-b-hbsag-screening-pregnancy) ## 3\. What Does an HCV Rapid Test Detect? Conventional hepatitis C rapid screening tests commonly detect: **Anti-HCV antibodies.** The [**Microsidd HCV 10 Minutes Fast Self Test Kit**](/products/hcv-10-minutes-fast-self-test-kit) is designed for initial Anti-HCV antibody screening. This means the rapid test identifies the immune system's antibody response associated with hepatitis C exposure. It does **not** directly detect HCV RNA. ## What Does a Reactive Anti-HCV Result Mean? A Reactive Anti-HCV result can occur with: - Current HCV infection - Previous HCV infection that cleared naturally - Previous HCV infection that was successfully treated - Occasional biological false antibody reactivity Therefore: **Reactive Anti-HCV ≠ automatically current hepatitis C infection.** ## What Test Establishes Current HCV Infection? **HCV RNA testing.** The pathway is: **Anti-HCV Reactive** ↓ **HCV RNA** ↓ **RNA Detected → Current HCV infection** **RNA Not Detected → No current HCV infection in most situations** ## Why Can Anti-HCV Remain Reactive After Cure? Because HCV antibody reflects the immune system's history of exposure. Successfully eliminating the virus does not necessarily eliminate the antibodies. This means someone cured of hepatitis C can continue to have a Reactive Anti-HCV rapid test. HCV antibody testing therefore should not be used to determine whether treatment succeeded. ## Continue Through the HCV / Hepatitis C Hub - [HCV Rapid Test Kit Complete Guide](/blogs/knowledge-hub/hcv-rapid-test-kit-complete-guide) - [HCV Rapid Test: Reactive vs Non-Reactive](/blogs/knowledge-hub/hcv-rapid-test-reactive-vs-non-reactive) - [HCV Antibody Reactive vs HCV RNA](/blogs/knowledge-hub/hcv-antibody-vs-hcv-rna) - [HCV Testing During Pregnancy & Mother-to-Child Transmission](/blogs/knowledge-hub/hcv-testing-during-pregnancy) ## 4\. What Does a Syphilis Rapid Test Detect? Conventional syphilis rapid diagnostic tests commonly detect: **Treponemal antibodies against _Treponema pallidum_.** _Treponema pallidum_ is the bacterium that causes syphilis. The [**Microsidd Syphilis Fast Test Kit Mono Pack**](/products/syphilis-fast-test-kit-mono-pack) is used for initial treponemal antibody screening. ## What Does a Reactive Syphilis Rapid Test Mean? A Reactive treponemal result means antibodies associated with _Treponema pallidum_ were detected. However: **Reactive treponemal antibody ≠ automatically new or currently active syphilis.** Treponemal antibodies commonly remain detectable following successful treatment. ## Why Are RPR and VDRL Different? RPR and VDRL are **nontreponemal tests**. Unlike a qualitative treponemal rapid test, they can provide quantitative titres useful in clinical interpretation and treatment follow-up. Depending on the diagnostic pathway, syphilis interpretation may therefore involve: - Treponemal test result - RPR or VDRL - Nontreponemal titre - Previous treatment history - Clinical examination - Possibility of recent exposure or reinfection ## Can a Treponemal Test Be Used to Check Whether Syphilis Treatment Worked? Generally, no. Treponemal antibodies often remain Reactive despite adequate treatment. Nontreponemal titres such as RPR or VDRL are used in the appropriate clinical setting to assess serological treatment response. ## Continue Through the Syphilis Hub - [Syphilis Rapid Test Kit Complete Guide](/blogs/knowledge-hub/syphilis-rapid-test-kit-complete-guide) - [Syphilis Rapid Test: Reactive vs Non-Reactive](/blogs/knowledge-hub/syphilis-rapid-test-reactive-vs-non-reactive) - [Syphilis Rapid Test vs RPR/VDRL](/blogs/knowledge-hub/syphilis-rapid-test-vs-rpr-vdrl) - [Syphilis Screening During Pregnancy](/blogs/knowledge-hub/syphilis-screening-during-pregnancy) ## Which Tests Detect Antigens and Which Detect Antibodies? Test Marker Type Marker HIV 3rd Generation Antibody HIV-1 / HIV-2 antibodies HIV 4th Generation Antibody + Antigen HIV antibodies + HIV-1 p24 antigen HBsAg **Antigen** Hepatitis B surface antigen HCV Rapid Test Antibody Anti-HCV antibodies Syphilis Rapid Test Antibody Treponemal antibodies ## The Simplest Marker Memory Guide **HIV** Antibody — or antibody + p24 antigen depending on the assay. **HBsAg** Hepatitis B surface **antigen**. **HCV** Anti-HCV **antibody** → HCV RNA if Reactive. **Syphilis** Treponemal **antibody** → RPR/VDRL and clinical interpretation as appropriate. ## Do All Four Reactive Results Mean “Active Infection”? **No.** This is one of the most important lessons in rapid infectious-disease testing. Reactive Test Can You Immediately Call It Active Infection? HIV Screening No — complete the applicable HIV diagnostic algorithm HBsAg It is an important marker of current HBV infection, but further evaluation is needed Anti-HCV No — HCV RNA is required to establish current infection Syphilis Treponemal Test No — antibodies can remain after previous treatment ## Do All Four Tests Use the Same Follow-Up? **No.** Every Reactive result enters a different pathway. Reactive Screening Result Main Next Question Follow-Up Concept HIV Can HIV infection be established under the appropriate algorithm? Additional HIV diagnostic testing HBsAg What is the person's HBV infection and replication status? HBV serology ± HBV DNA and clinical assessment Anti-HCV Is hepatitis C virus currently present? HCV RNA Treponemal Syphilis Test Does this reflect untreated infection, previous treatment or another serological pattern? RPR/VDRL + history + appropriate testing algorithm ## Can an Antibody Test Stay Reactive After Treatment? Yes, depending on the infection. ### HCV Anti-HCV antibodies commonly remain detectable after spontaneous clearance or successful treatment. ### Syphilis Treponemal antibodies commonly remain detectable after successful treatment. ### HIV People with established HIV generally remain antibody Reactive despite effective antiretroviral treatment and viral suppression. This is why disease monitoring requires infection-specific laboratory markers rather than repeatedly performing the original antibody screening test. ## Does HBsAg Behave the Same Way? No. HBsAg is an antigen rather than an antibody. HBsAg can be detected during both acute and chronic HBV infection. The broader hepatitis B serological profile is required to understand infection status properly. ## Can One Test Detect HIV, HBsAg, HCV & Syphilis? An ordinary single-analyte cassette cannot simply be assumed to test for all four infections. Separate validated assays or specifically designed and validated multiplex products are required. Never assume two rapid tests are interchangeable because their cassettes look similar. ## WHO Has a Triple Antenatal Rapid-Test Panel — What Does That Mean? WHO has prequalified a bundled antenatal panel designed to test for three important infections: - HIV - Hepatitis B - Syphilis This aligns with the global Triple Elimination initiative. It does **not** mean HCV has become part of WHO's formal Triple Elimination trio. ## Can a Reactive Result on One Test Predict the Others? **No.** For example, someone can have: - HIV Non-Reactive + HBsAg Reactive - HBsAg Non-Reactive + Anti-HCV Reactive - HCV Non-Reactive + Syphilis Reactive - More than one Reactive infection marker - All four screening results Non-Reactive Every infection requires its own validated test. ## Why Are These Tests Often Ordered Together? They can appear together in settings such as: - Antenatal care - Diagnostic laboratories - Blood-borne infection investigations - Sexual-health evaluation - Pre-procedure assessment according to protocol - Occupational exposure evaluation - Risk-based infectious-disease testing The tests are grouped because several infections may need assessment in the same clinical setting—not because they detect the same organism or marker. ## Are HIV, HBsAg, HCV & Syphilis All “STD Tests”? Calling all four simply “STD tests” is an oversimplification. A more accurate group description is: **Infectious-disease screening** or: **Blood-borne and sexually transmissible infection screening.** The transmission routes differ: - HIV can be transmitted sexually, through blood and vertically. - HBV can be transmitted sexually, through blood and vertically. - HCV is primarily blood-borne, although sexual and perinatal transmission can occur. - Syphilis is predominantly transmitted through direct contact with infectious lesions during sexual contact and can also be transmitted vertically during pregnancy. ## Do All Four Tests Have the Same Window Period? **No.** Window periods differ because the tests detect different biological markers. The correct question is: **Which infection + which marker + which exact assay + how long since the possible exposure?** ## Why Can Recent Infection Be Missed? After infection occurs, a biological marker may take time to become detectable. For example: - HIV p24 antigen can become detectable before HIV antibodies in some infections. - HCV RNA can become detectable before Anti-HCV antibodies. - Treponemal antibodies may not yet be detectable during very early syphilis. - HBV serological markers change according to the stage of infection. Therefore, a Non-Reactive rapid-test result should not automatically override a significant recent exposure or strong clinical suspicion. ## What Does an Invalid Rapid-Test Result Mean? Across all four test groups: **Invalid = no interpretable result.** Invalid does not mean: - Non-Reactive - Negative - No infection If the test's required control criterion is not met, follow the exact manufacturer's Instructions for Use regarding repeat testing. ## Can Test-Line Darkness Tell How Severe the Infection Is? **No.** Qualitative rapid-test line intensity cannot be used to estimate: - HIV viral load - HBV DNA - HCV RNA viral load - RPR/VDRL titre - Liver damage - Disease duration - Likelihood of treatment success - Mother-to-child transmission risk Interpret the cassette only according to its validated qualitative result criteria. ## Can Test Buffers Be Interchanged? **No, unless the manufacturer explicitly authorises it.** Do not substitute: - HIV buffer into an HBsAg test - HBsAg buffer into an HCV test - HCV buffer into a syphilis test - Water or saline for the supplied assay buffer Even visually similar rapid-test kits may have different chemistry, specimen requirements and flow characteristics. ## Do All Rapid Tests Use the Same Blood Volume? No. The required specimen volume is product specific. Never copy the blood volume from: - Another infection test - Another manufacturer's kit - A generic online diagram Follow the exact Instructions for Use supplied with the test. ## Do All Four Rapid Tests Use the Same Reading Time? No. Do not assume every rapid test is read at: - 5 minutes - 10 minutes - 15 minutes - 20 minutes Use the exact reading window specified for the individual product. ## How Do These Four Tests Connect to Pregnancy? Antenatal care provides an important opportunity to identify maternal infections that can affect the mother, pregnancy or baby. However, the four infections do not have identical pregnancy pathways. ## WHO Triple Elimination: HIV + Syphilis + Hepatitis B WHO's formal Triple Elimination initiative focuses on preventing mother-to-child transmission of: - **HIV** - **Syphilis** - **Hepatitis B** These infections are integrated within maternal and infant prevention programmes. Read the full antenatal pathway: [**Antenatal Infection Screening: HIV, Syphilis, Hepatitis B & HCV**](/blogs/knowledge-hub/antenatal-infection-screening-hiv-syphilis-hepatitis-b-hcv) ## Why Is HCV Included in This Microsidd Maternal Hub? Current maternal HCV infection can result in perinatal exposure and mother-to-child transmission. Therefore, HCV has genuine pregnancy relevance. However: **HCV is not the fourth infection in WHO's formal Triple Elimination framework.** Pregnancy-screening recommendations for HCV vary between jurisdictions and healthcare systems. ## Pregnancy-Specific Comparison Infection Initial Marker Why Identification During Pregnancy Matters HIV HIV antibody or Ag/Ab depending on assay Maternal treatment and infant care can greatly reduce vertical transmission Hepatitis B HBsAg Identifies maternal infection requiring evaluation and newborn prevention planning Syphilis Treponemal / nontreponemal testing according to programme Timely maternal diagnosis and treatment can prevent congenital syphilis Hepatitis C Anti-HCV followed by RNA when Reactive Current maternal infection identifies infants requiring appropriate postnatal follow-up ## Pregnancy Test + Four Infection Tests: The Five-Marker Comparison Test Marker Pregnancy Test **hCG** HIV Test **HIV antibody ± p24 antigen** HBsAg Test **Hepatitis B surface antigen** HCV Test **Anti-HCV antibody** Syphilis Test **Treponemal antibody** This creates a simple five-dot memory pathway: **hCG → HIV → HBsAg → HCV → Syphilis** But remember: **Five tests = five different biological questions.** ## Pregnancy Test Positive? Follow This Path **Step 1 — Understand your pregnancy result** [Pregnancy Test Positive? Understanding the Next Antenatal Tests](/blogs/knowledge-hub/positive-pregnancy-hiv-hbsag-hcv-syphilis-tests) **Step 2 — Prepare for your first antenatal visit** [Pregnancy Confirmed? First Antenatal Visit & Important Screening Tests](/blogs/knowledge-hub/positive-pregnancy-first-antenatal-visit-tests) **Step 3 — Understand maternal infection screening** [Antenatal Infection Screening: HIV, Syphilis, Hepatitis B & HCV](/blogs/knowledge-hub/antenatal-infection-screening-hiv-syphilis-hepatitis-b-hcv) **Step 4 — Follow the relevant infection-specific pregnancy guide** - [HIV Testing During Pregnancy](/blogs/knowledge-hub/hiv-testing-during-pregnancy-antenatal-care) - [Hepatitis B / HBsAg Screening During Pregnancy](/blogs/knowledge-hub/hepatitis-b-hbsag-screening-pregnancy) - [Syphilis Screening During Pregnancy](/blogs/knowledge-hub/syphilis-screening-during-pregnancy) - [HCV Testing During Pregnancy](/blogs/knowledge-hub/hcv-testing-during-pregnancy) ## Microsidd Rapid-Screening Products Product Primary Target [Microsidd HIV 3rd Generation Test Kit](/products/microsidd-hiv-3rd-generation-test-kit) HIV-1 / HIV-2 antibodies [Microsidd HIV 4th Generation Test Kit](/products/4th-generation-hiv-test-kit) HIV antibodies + HIV-1 p24 antigen [Microsidd HBsAg Fast Test Kit Mono Pack](/products/hbsag-fast-test-kit-mono-pack) Hepatitis B surface antigen [Microsidd HCV 10 Minutes Fast Self Test Kit](/products/hcv-10-minutes-fast-self-test-kit) Anti-HCV antibodies [Microsidd Syphilis Fast Test Kit Mono Pack](/products/syphilis-fast-test-kit-mono-pack) Treponemal antibodies ## Frequently Asked Questions ### What does an HIV rapid test detect? Third-generation HIV tests detect HIV antibodies. Fourth-generation antigen/antibody tests detect HIV antibodies together with HIV-1 p24 antigen. ### Is HBsAg an antibody? No. HBsAg is hepatitis B surface antigen. ### What does an HCV rapid test detect? Conventional HCV rapid screening tests commonly detect Anti-HCV antibodies rather than the virus itself. ### What test confirms whether HCV is currently present? HCV RNA testing is used to determine whether current hepatitis C infection is present. ### What does a syphilis rapid test detect? Conventional rapid syphilis tests commonly detect treponemal antibodies associated with _Treponema pallidum_. ### Does a Reactive Anti-HCV result mean active hepatitis C? Not necessarily. HCV RNA is required to establish current infection. ### Does a Reactive syphilis rapid test always mean new syphilis? No. Treponemal antibodies can persist after previously treated infection. ### Does a Reactive HBsAg test mean hepatitis B infection? HBsAg is an important marker of current HBV infection, but appropriate laboratory and clinical evaluation is needed to understand the complete HBV status. ### Can one Reactive HIV test alone establish an HIV diagnosis? A Reactive screening result should proceed through the applicable HIV diagnostic testing algorithm. ### Which test detects an antigen? HBsAg directly detects hepatitis B surface antigen. Fourth-generation HIV tests also include HIV-1 p24 antigen detection alongside antibody detection. ### Which tests detect antibodies? HIV antibody tests, Anti-HCV tests and conventional treponemal syphilis rapid tests detect antibodies. ### Can HCV antibodies remain Reactive after cure? Yes. Anti-HCV commonly remains detectable after spontaneous clearance or successful treatment. ### Can syphilis antibodies remain Reactive after successful treatment? Yes. Treponemal antibodies commonly remain Reactive after adequate treatment. ### Can rapid-test line darkness tell viral load? No. Qualitative rapid-test line intensity should not be used to estimate HIV viral load, HBV DNA, HCV RNA or disease severity. ### Can the same buffer be used for HIV, HBsAg, HCV and syphilis tests? No substitution should be made unless explicitly authorised by the manufacturer. Use the components supplied for the exact test. ### Do all four rapid tests use the same blood volume? No. Required specimen volume is product specific and must be taken from the exact manufacturer's Instructions for Use. ### Do all rapid tests use the same reading time? No. Reading windows differ between products. Follow the exact IFU for each test. ### Are HIV, HBsAg, HCV and syphilis all part of WHO Triple Elimination? No. WHO Triple Elimination specifically covers HIV, syphilis and hepatitis B. ### Why is HCV included in the Microsidd pregnancy hub? Current maternal HCV infection can result in perinatal exposure, so HCV has pregnancy relevance even though it is not part of the formal WHO Triple Elimination trio. ### Does a positive pregnancy test tell me anything about these four infections? No. A pregnancy test detects hCG. HIV, HBsAg, HCV and syphilis tests detect completely different biological markers. ### Should everyone with a positive pregnancy test independently perform all four rapid tests? No. Antenatal screening should follow the testing plan recommended by the person's qualified healthcare professional and applicable local or national protocol. ## Explore the Complete Maternal & Infectious Disease Pathway - [FSH vs LH vs Pregnancy Test: Which Test to Use and When?](/blogs/knowledge-hub/fsh-vs-lh-vs-pregnancy-test) - [Pregnancy Test Positive? Understanding the Next Antenatal Tests](/blogs/knowledge-hub/positive-pregnancy-hiv-hbsag-hcv-syphilis-tests) - [Pregnancy Confirmed? First Antenatal Visit & Important Screening Tests](/blogs/knowledge-hub/positive-pregnancy-first-antenatal-visit-tests) - [Antenatal Infection Screening: HIV, Syphilis, Hepatitis B & HCV](/blogs/knowledge-hub/antenatal-infection-screening-hiv-syphilis-hepatitis-b-hcv) ## Medical Information Notice This article is intended for general educational and product-information purposes. It does not replace the manufacturer's Instructions for Use, professional infectious-disease testing, laboratory diagnosis, antenatal care or individual medical advice. HIV, HBsAg, HCV and syphilis rapid tests detect different biological markers and require different interpretation and follow-up pathways. A Reactive HIV screening result should proceed through the applicable HIV diagnostic algorithm. A Reactive HBsAg result requires appropriate hepatitis B evaluation. A Reactive Anti-HCV result does not by itself establish current hepatitis C infection; HCV RNA testing is required to determine whether virus is currently present. A Reactive treponemal syphilis result does not by itself distinguish current untreated infection from previously treated infection. A Non-Reactive result may not exclude very recent infection when testing occurs before the relevant marker becomes detectable. Anyone who is pregnant, has had a recent significant exposure, has symptoms or receives an unexpected Reactive result should obtain appropriate evaluation from a qualified healthcare professional. **Tags:** comparison, HBsAg, HCV & Syphilis Rapid Tests, HIV, hiv vs hcv vs hbsag vs syphilis comparison --- > Source: [Microsidd India](https://microsidd.com/blogs/knowledge-hub/hiv-vs-hbsag-vs-hcv-vs-syphilis-rapid-tests)