Hepatitis B Surface Antigen Test (HBsAg)

Blood Test for Detecting Active Hepatitis B Infection

Need to check for active Hepatitis B infection?
The Hepatitis B Surface Antigen (HBsAg) Test is used to detect current (acute or chronic) Hepatitis B infection and is often the earliest indicator of infection.

✔ Detects active Hepatitis B infection
✔ Earliest marker of acute infection
✔ Used for screening, diagnosis & blood donor safety

⏱ Typical turnaround: results are usually emailed in 1–3 days.

⚠️ Important: Not an Immunity (Titer) Test

This is NOT a titer test.

• Does NOT measure immunity
• Does NOT confirm protection from vaccination
• Used only to detect active infection

👉 To check immunity, you need a Hepatitis B Surface Antibody (Anti-HBs IgG) Titer Test

What This Test Measures

Hepatitis B Surface Antigen

HBsAg

This test detects the presence of viral surface antigen, which indicates:

• Acute (recent) infection
• Chronic Hepatitis B infection

📌 HBsAg is typically the earliest detectable marker of Hepatitis B infection

📌 It may be present before symptoms appear

Why Choose This Test?

✅ Screens for active Hepatitis B infection
✅ Used in blood donor screening (HBsAg-positive donors are rejected)
✅ Helps identify chronic carriers of Hepatitis B
✅ Important for diagnosis and medical evaluation

👉 Essential when infection—not immunity—is the concern

Understanding Your Results

HBsAg Results

👉 Positive result → Indicates active Hepatitis B infection (acute or chronic)
👉 Negative result → No detectable surface antigen at time of testing

⚠️ Important Clinical Note (Window Period)

A negative result does not always rule out infection.

There is a “core window” period where:

• HBsAg becomes negative
• Antibodies (Anti-HBs) have not yet developed

📌 During this stage, anti-HBc IgM may be the only detectable marker of acute infection

👉 Additional testing may be required if infection is strongly suspected

When Is This Test Used?

• Screening for Hepatitis B infection
• Evaluating acute or chronic hepatitis symptoms
• Blood donor screening
• Identifying HBV carriers
• Medical diagnostic workups

Why Hepatitis B Testing Matters

Hepatitis B is a serious liver infection that can become chronic and lead to:

• Liver damage
• Cirrhosis
• Liver cancer

👉 Early detection helps guide proper medical care and monitoring

Fast, Reliable Results

Receive a lab-certified report including:

• HBsAg result
• Reference information
• Clear documentation

Important Information

• This test is used to detect infection—not immunity
• Additional testing may be required for full evaluation
• Follow up with a healthcare provider if results are positive
• This service provides lab testing only (not diagnosis or treatment)

Check for Active Hepatitis B Infection

Accurate. Early detection. Clinically important.

👉 Order your Hepatitis B Surface Antigen (HBsAg) Test today