Hepatitis A Virus Antigen (HAVAg)

Hepatitis A virus antigen is a substance that can trigger the production of hepatitis A virus antibodies. The detection of hepatitis A virus antigen can confirm the presence of hepatitis A virus in the body. 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: Prompt for viral hepatitis. Tips: Do not go to the toilet frequently. Hepatitis A virus (antigen) is present in the feces of the patient 10 to 20 days after infection, and is usually discharged from the feces 1 to 15 days before the onset of the disease. Normal value negative. Clinical significance Abnormal results: This test is mainly used for the auxiliary diagnosis of hepatitis A. Positive is seen in the incubation period of hepatitis A and within a few days after onset. At this time, blood and feces are contagious. Feces are the main source of infection. The detection of hepatitis A virus can start from 1 to 2 weeks before onset, peak at the onset, and alanine aminotransferase (ALT) reaches the peak before detoxification. Generally, 50% of patients with acute hepatitis A can detect hepatitis A virus in the feces one week after hospitalization. The significance of the epidemiological investigation of hepatitis A virus is greater than clinical. Especially after the detection of hepatitis A in the child care institution, it is important to collect the same population of feces for early detection of the latent period and subclinical infection, so as to isolate the infection as soon as possible and cut off the source of infection, which is of great significance for controlling the epidemic of hepatitis A. Hepatitis A virus and its RNA detection can be used for food quarantine and tracking of infectious sources. For example, the quarantine of Hekoukou water source and shellfish food in the endemic area can determine the source of infection as early as possible. People who need to be tested: General malaise, nausea, vomiting and fever, fatigue, loss of appetite, abnormal liver function. Precautions Before testing: Do not go to the toilet frequently. Hepatitis A virus (antigen) is present in the feces 10 to 20 days after infection. It is usually discharged from the feces 1 to 15 days before the onset of the disease, which is difficult to capture clinically. When testing: Hepatitis A virus (antigen) is positive, indicating that the patient is infected with hepatitis A, which is early in the acute phase. Inspection process Hepatitis A patients generally do not undergo pathogen separation tests, and microbiological tests mainly measure viral antigens or antibodies. Not suitable for the crowd There are no taboos. Adverse reactions and risks There are no related complications and hazards.