1035. Hepatitis B virus (HBV), HBsAg (Australia antigen)
Description
Hepatitis B surface antigen (HBsAg) is a protein found on the surface of the hepatitis B virus. HBsAg is detected in the blood during acute and chronic HBV infection, as well as after recent HBV vaccination.
Important! In patients with a negative HBsAg result, acute viral hepatitis B should not be ruled out, as some individuals may experience a 'window stage' where HBsAg becomes negative but antibodies (anti-HBsAg) have not yet been synthesized.
When and who needs the test?
- In the presence of the following symptoms: yellowing of the mucous membranes and skin, pain in the right upper quadrant, dark urine, discolored stool, vomiting.
- To confirm the diagnosis of acute hepatitis B.
- To confirm the diagnosis of chronic hepatitis B (if the result is positive for more than 6 months).
- Prenatal screening of children born to mothers who are HBV carriers to determine prophylactic treatment.
- Monitoring the treatment of chronic HBV.
- Preventive screening of risk groups and donors.
- Decision-making about hepatitis B vaccination.
- Preparing for and during pregnancy.
Biological material
- Venous blood
Preparing for a blood test
In order to exclude factors that may affect the test results, we recommend to follow the preparation rules:
- an important condition for laboratory tests is to take blood on an empty stomach.
- 6-12 hours before the test, you should avoid eating, drinking alcohol, smoking, and limit physical activity. Drinking...
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