Hepatitis B test Seoul: know your status

What a hepatitis B test in Seoul checks

Hepatitis B is a virus that infects the liver. It spreads through blood and body fluids, including from mother to baby at birth, through sex, and through shared needles or unsterile equipment. Many people with long-term (chronic) infection feel completely well for years, which is why testing is the only way to know.

A standard hepatitis B test Seoul panel at VEI Clinic looks at three markers. Dr. HyunSung Park, a board-certified internal medicine specialist and gastroenterology subspecialist, reviews them together because each one answers a different question.

• HBsAg (surface antigen): positive means you currently have hepatitis B infection
• Anti-HBs (surface antibody): positive means you are immune, from vaccination or past recovery
• Anti-HBc (core antibody): positive means you have been exposed to the virus at some point; vaccination alone does not make it positive

Reading your results

If you have chronic hepatitis B, follow-up usually includes liver function tests, viral load (HBV DNA), other hepatitis B markers and liver ultrasound. Not everyone with chronic hepatitis B needs antiviral medication, but everyone needs regular monitoring because of the long-term risk of liver scarring and liver cancer.

• All negative: never infected and not immune, so vaccination is recommended
• Anti-HBs positive only: immune through vaccination
• Anti-HBs and anti-HBc positive, HBsAg negative: past infection that has cleared, with immunity
• HBsAg and anti-HBc positive: current infection; further tests decide whether it is new or chronic and whether treatment is needed
• Anti-HBc positive alone: needs interpretation and sometimes further testing

Hepatitis B in Korea: why testing matters here

Korea once had a high rate of hepatitis B. A national infant vaccination program begun in the 1990s has sharply reduced infection among younger generations, but chronic infection remains more common in older adults, and hepatitis B is still a leading cause of liver cirrhosis and liver cancer in Korea. Many workplaces, schools and healthcare settings therefore include hepatitis B in health checks.

For expats, a hepatitis B test is also commonly requested for some employment health checks, hospital and teaching jobs, or before starting certain medications that can reactivate the virus, such as chemotherapy, some biologic drugs and steroids. Let us know which form or format your employer requires.

If you are found to have hepatitis B, testing for close household contacts and sexual partners is recommended, and those who are not immune should be vaccinated.

The hepatitis B vaccine: three doses

The standard adult schedule is three doses given at 0, 1 and 6 months. Completing all three gives long-lasting protection in most healthy adults. If you miss a dose, you do not need to restart; we simply continue the series. Some people, such as healthcare workers, have a blood test one to two months after the final dose to confirm immunity.

The vaccine is very safe. Common side effects are a sore arm and occasionally mild fever or tiredness. It should not be given to anyone who has had a severe allergic reaction to a previous dose or to yeast. Pregnancy is not a reason to avoid vaccination when there is a risk of infection; discuss it with the doctor.

Who should test, and red flags

Testing is sensible if you were born in a region where hepatitis B is common, have a family member with hepatitis B, are pregnant, have abnormal liver tests, live with or have sex with someone infected, have HIV or hepatitis C, inject drugs, or are about to start immune-suppressing treatment.

Seek urgent care or call 119 if you develop yellowing of the skin or eyes with confusion or extreme drowsiness, vomiting blood, black stools, or severe abdominal swelling or pain. These can indicate serious liver problems that need hospital care.