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Hepatitis B Virus Genotyping (Serum)

Published: August 9, 2026Updated: August 16, 2026

This test identifies which specific strain (genotype) of the Hepatitis B virus you may have, helping doctors determine the best treatment approach.

Quick summary

["Knowing your Hepatitis B genotype helps guide personalized care and treatment plans."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
49881-6
Short code
HBV 236 Islt Genotyp
Synonyms
HBV 236 Islt Genotyp
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
genotyping
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Matters

Hepatitis B virus (HBV) exists in several different genotypes, each affecting how the virus behaves and responds to treatment. This test helps doctors choose the most effective antiviral medication for your situation.

How the Test Works

A small blood sample is drawn from your arm. The serum (liquid part of blood) is tested using a molecular method to detect and classify the HBV genotype.

What to Expect Before the Test

No special preparation is needed. You may have a slight bruise or soreness at the injection site, but this usually fades quickly. If you’re on blood-thinning medication, let your doctor know before the test.

What to Expect After the Test

You can return to your normal activities immediately. If you experience unusual bleeding, swelling, or pain at the injection site, contact your healthcare provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Hep B Genotype Test

Frequently asked questions

Different HBV genotypes respond differently to treatments like tenofovir, entecavir, or peginterferon. Knowing your genotype helps your doctor tailor treatment to improve outcomes and reduce the risk of long-term liver damage.
This test is not used to diagnose acute infection but is critical for managing chronic HBV to prevent complications like cirrhosis or liver cancer.
How often should I get this test?
Your doctor will determine the frequency based on your health status, treatment plan, and genotype. Regular follow-ups are usually recommended to monitor your response to treatment.
Does this test hurt?
A small needle is used to draw blood, which may cause a brief pinch or discomfort. Most people find it tolerable, and the pain is usually minimal.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy