4-Infection Blood STI Panel
฿2,290
HIV, syphilis, hepatitis B and hepatitis C, assessed through six blood markers.
- Panel results
- 24 hours
Kauri Health Clinic · BTS Punnawithi
Hepatitis B: infection, immunity and blood tests
Understand current infection, immunity, HBsAg and Anti-HBs.
- Infection type
- Viral infection
- Relevant sample
- Blood testing
- Treatment outlook
- Acute or chronic; care depends on results
How is hepatitis B transmitted?
Routes include sex with a person who has hepatitis B, sharing needles or equipment contaminated with blood, and transmission from a mother to a baby at birth. Sharing razors or toothbrushes can also create blood exposure. Hepatitis B is not usually spread by sharing meals, hugging, coughing or contaminated food and water. Testing and vaccination of partners or household contacts may help prevent infection.
What symptoms can hepatitis B cause?
Possible symptoms are fatigue, reduced appetite, nausea, abdominal pain, joint pain, dark urine and yellow skin or eyes. Acute symptoms may appear about 60–150 days after infection, but many infections cause none. This symptom timeline is not the test window. Chronic hepatitis B can remain silent while affecting the liver, so symptoms alone cannot show whether infection is present or how much liver inflammation there is.
Does hepatitis B stay in the body forever?
Not always. Most otherwise healthy adults clear a new infection, while infection acquired in infancy is much more likely to become chronic. HBsAg remaining positive for at least 6 months supports chronic hepatitis B. Some antibodies can remain after a past infection has resolved, so an antibody result is not the same as ongoing active infection. Chronic infection needs follow-up even when someone feels well because liver scarring and liver cancer risks can increase.
What is the difference between HBsAg and Anti-HBs?
HBsAg looks for hepatitis B surface antigen and helps assess current infection. Anti-HBs looks for surface antibodies associated with protection, often after vaccination or recovery. They answer different questions and are not two separate infections. A fuller first-time assessment may also include total Anti-HBc, which helps identify previous natural infection. Kauri's listed STI blood panel includes HBsAg and Anti-HBs, not the complete three-marker hepatitis B panel.
How is hepatitis B treated and monitored?
Acute hepatitis B usually receives supportive care. Chronic hepatitis B is assessed with liver tests, viral activity and liver-health evaluation; not everyone needs immediate medication, but monitoring matters. Tenofovir or entecavir are commonly used antivirals when treatment is indicated. They suppress the virus and reduce liver complications rather than reliably curing every infection. A positive screening result is the starting point for confirmation and an appropriate liver-care plan.
What should I do after a possible hepatitis B exposure?
Seek prompt medical advice rather than waiting for symptoms. Hepatitis B vaccination and sometimes hepatitis B immune globulin may be needed, depending on the exposure and your documented protection. An early negative blood test may need follow-up. Share vaccination dates and previous reports; recent vaccination can temporarily affect HBsAg results. Pregnancy with hepatitis B needs coordinated care to protect the baby. For continuing prevention, use condoms and avoid sharing needles, razors or toothbrushes.
Patient questions
Hepatitis B: common questions
Does a positive Anti-HBs result mean I have hepatitis B?
Not by itself. Anti-HBs usually relates to immunity rather than current infection. The clinician interprets the level alongside HBsAg, vaccination history and other markers when needed.
Do low hepatitis B antibodies always mean I need another vaccine?
No. Antibody levels can fall over time while immune memory persists after a completed vaccine course. Recommendations depend on vaccination records, immune status and exposure risk; one result alone does not decide the plan.
Applicable individual blood tests
View individual blood testsPanel turnaround starts after sample collection; it is not the time from exposure until infection becomes detectable. Individual-test timing and any additional clinical assessment are confirmed separately.
STI clinical references
Updated 17 October 2026. Educational information based on the clinical sources below; Kauri supplied the listed service availability and prices. Your assessment determines the tests and treatment appropriate for you.
Kauri Health Clinic · BTS Punnawithi
Plan a confidential visit at BTS Punnawithi
Kauri Health Clinic is at BTS Punnawithi, 3063 Sukhumvit Rd, Bang Chak, Phra Khanong, Bangkok 10260. Open Tuesday–Saturday, 9:00–18:00; closed Sunday and Monday. Tell us your concern, when any exposure happened and whether you have symptoms. Bring previous results and a list of medicines; the team will explain preparation and next steps privately.
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