Hepatitis B virus surface antigen (HBsAg)

Hepatitis B virus surface antigen (HBsAg) refers to small spherical particles and tubular particles contained in the outer shell portion of hepatitis B virus. It is now divided into eight different subtypes and two mixed subtypes. Hepatitis B virus surface antigen appears in the blood circulation of patients in the early stage of hepatitis B virus infection and can last for several months, years and even life. It is the most commonly used indicator for diagnosing hepatitis B virus infection. However, in the window of the so-called hepatitis B virus infection, the hepatitis B virus surface antigen can be negative, and the serological markers such as the hepatitis B virus core antibody can be positive. Basic Information Specialist classification: Infectious disease examination and classification: immunological examination Applicable gender: whether men and women apply fasting: not fasting Analysis results: Below normal: Normal value: no Above normal: negative: normal. Positive: Early acute or chronic hepatitis B surface antigen carriers have a certain infectivity. Tips: If the examiner wants to check liver function (hepatitis B ultrasound) at the same time, it must be fasted. Normal value Qualitative negative (-). Clinical significance This test is used to determine if a hepatitis B (hepatitis B) virus is infected. 1. HBsAg positive is an indicator of infection with hepatitis B virus. HBsAg itself is antigenic and non-infectious. 2. Other liver function is normal and only HBsAg positive, known as hepatitis B virus carriers. 3. The titer of HBsAg can judge the infectivity of patients. The higher the titer of HBsAg, the greater the possibility of HBsAg and hepatitis B virus DNA positive, and the greater the infectivity. 4. "Da Sanyang" means that hepatitis B surface antigen (HBsAg), E antigen (HBeAg) and core antibody (HBcAb) are positive in the two-and-a-half test of hepatitis B. It is suggested that hepatitis B virus infection is active and infectious. It does not indicate whether the condition is serious. 5. "Small Sanyang" means that hepatitis B surface antigen (HBsAg), E antibody (HBeAb) and core antibody (HBcAb) are positive in the two-and-a-half test of hepatitis B. prompt (1) In most cases, it indicates a reduction in hepatitis B virus replication. Still contagious. (2) The shift from “big three yang” to “small three yang” does not mean that hepatitis B virus replication completely stops. A small number of “small three yang” patients have positive serum HBV-DNA, active virus replication, serious disease, and rapid progress. Seen in the virus variation. Positive results may be diseases: hepatitis B antigenemia, post-hepatitis syndrome, acute and chronic hepatitis precautions The results of the examination must be combined with several other hepatitis B inspection items. Inspection process 1. Take venous blood and test. 2. Serological examination of the virus. Not suitable for the crowd People with reduced hematopoietic function such as leukemia, various anemia, myelodysplastic syndrome, or people with thrombocytopenia should pay attention to blood draw, and should not take more or more blood. Adverse reactions and risks 1. After the blood is drawn, do not press the needle hole to avoid subcutaneous hematoma. If there is a small piece of bruise in the blood, it is slightly tender, please don't panic, you can do hot compress after 24 hours to promote the absorption of blood. The general small amount of congestion will gradually absorb in 3 to 5 days and the color will become lighter and return to normal. 2. After the blood draw, symptoms such as dizziness, vertigo, fatigue, etc. should be immediately supine, drink a small amount of syrup, and then undergo a physical examination after the symptoms are relieved.