HbsAg (card)
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Certified Labs
NABH Accredited
60 mins collection
Not specified
Reports in
3 hrs
Measures
Hepatitis B surface antigen in the blood
Identifies
Presence of Hepatitis B Virus (HBV) infection (specifically the surface antigen)
About The Test
What Is the HBsAg (Card) Test and Why Is It Important?
The HBsAg (card) test is a qualitative immunoassay – a type of diagnostic test designed for the rapid detection of Hepatitis B surface antigen (HBsAg) in a blood sample. HBsAg is a protein found on the surface of the Hepatitis B virus. Its presence in your blood indicates an active HBV infection, which can be either acute (newly acquired) or chronic (long-lasting).
This test is incredibly important for several reasons:
- Early Detection
- Prevention of Transmission
- Screening Tool
At Cadabam’s Diagnostics, we utilize reliable HBsAg (card) test kits as part of our comprehensive diagnostic services to provide quick initial insights into potential HBV infections.
What Does the HBsAg (Card) Test Measure?
The HBsAg (card) test specifically measures the presence or absence of the Hepatitis B surface antigen (HBsAg) in your bloodstream.
It’s important to understand what this test doesn't measure:
- Antibodies (like Anti-HBs or Anti-HBc)
- Viral load (HBV DNA)
The HBsAg (card) test provides a simple "yes" or "no" answer regarding the presence of this specific viral protein at the time of testing.
When is the HBsAg (Card) Test Usually Taken?
The HBsAg (card) test is commonly performed in:
- Routine checkups
- Prenatal screening
- Blood and organ donation
- Occupational health
- Suspected hepatitis symptoms
- Post-exposure cases
- High-risk group screening
- Pre-vaccination
- Before immunosuppressive therapies
Are There Any Risks or Limitations to the HBsAg (Card) Test?
Risks are minimal and related to the blood draw:
- Finger prick: Minimal discomfort
- Venipuncture: Slight pain, bruising, rare fainting
Limitations:
- Window period may cause false negatives
- Rare false positives
- Confirmation with ELISA or CLIA is required
- Doesn’t determine infection stage
- Doesn’t indicate immunity
List of Parameters
What Parameters Are Evaluated in the HBsAg (Card) Test?
The HBsAg (card) test evaluates:
- Presence or absence of HBsAg
Results:
- Non-Reactive (Negative)
- Reactive (Positive)
- Invalid
Why This Test
Who Should Consider Taking the HBsAg (Card) Test?
Consider testing if you:
- Show hepatitis symptoms
- Were born in high-HBV-prevalence regions
- Are unvaccinated with risk factors (e.g. IV drug use, multiple partners)
- Are pregnant
- Need immunosuppressive therapy
- Have unexplained liver disease
- Are a blood/organ donor
- Are in correctional facilities
Benefits
The Advantages of the HBsAg (Card) Test for Your Health
- Quick results (15–30 min)
- Early detection of HBV
- Helps prevent transmission
- Guides further medical care
- Peace of mind in many cases
- Suitable for low-resource or outreach settings
What Conditions Can the HBsAg (Card) Test Diagnose?
- Acute Hepatitis B
- Chronic Hepatitis B
Note: This is a screening tool—confirmatory testing and full evaluation are required for diagnosis.
Test Preparation
Preparing for Your HBsAg (Card) Test
- No fasting required
- Provide relevant medical history
- Suitable for all age groups
Procedure:
- Finger prick or venous blood draw
- Blood applied to the test card
- Buffer added
- Wait for 15–30 mins
- Results read by trained personnel
Caution: Inform the phlebotomist about any bleeding disorders or medications
Test Results
Interpreting the Results of Your HBsAg (Card) Test
| Test Result | Interpretation | Next Steps |
|---|---|---|
| Non-Reactive | HBsAg not detected | Likely no infection, unless within the window period. Consider re-testing if recently exposed. |
| Reactive | HBsAg detected | Likely infection. Requires confirmatory testing with ELISA/CLIA. Consult a doctor for further evaluation. |
| Invalid | Test failed | Retest with a new sample or kit. |
FAQs
What does a positive HBsAg card test mean?
A reactive result suggests an active infection (acute or chronic). Requires confirmation.
How accurate is the rapid HBsAg card test?
High-quality kits are generally accurate but slightly less sensitive than lab-based tests.
How quickly are results available?
Within 15–30 minutes.
Do I need to fast?
No, fasting is not necessary.
How is it different from other Hepatitis B tests
This test detects HBsAg only. Others assess antibodies, viral load, or immune status.
What if my test is positive?
See your doctor for confirmatory testing and guidance on next steps.