Hepatitis B Surface Antigen (HBsAg) is a blood test performed to determine if someone is infected with the hepatitis B virus. HBsAg also known as Autralia antigen is present on the surface of Hepatits B Virus.

Why is HBsAg performed?

This test detects the presence of Hepatitis B virus
Performed on individuals who are at a high risk of acquiring infection
Performed on individuals with signs and symptoms of hepatitis, like jaundice and elevated ALT (alanine aminotransferase) levels in Liver Function Test
Performed as a screening test for Hepatitis B infection following accidental exposure to Hepatitis B virus.

WHAT DOES HBsAg MEASURE?

Hepatitis B is an infection of the liver caused by Hepatitis B virus. This test detects the presence of antigens and antibodies produced in response to an infection.

Hepatitis is an inflammation of liver. The type of hepatitis is named for the virus that cause it, for example, Hepatitis A, Hepatitis B, Hepatitis C, Hepatitis D and Hepatitis E.

A positive or reactive HBsAg shows the presence of Hepatitis B virus in blood, and the person is infected. Hepatitis B antigen appears in the blood after 6-16 weeks following exposure to Hepatitis B virus. Persistence of Hepatitis B surface antigen for more than 6 months indicates a chronic HBV infection, which can damage the liver.

1. How is the test performed?

This test is performed on a blood sample. The blood is obtained from the vein and this is performed by a health care provider in the following way.

Clean the skin
Put an elastic band above the area
Insert a needle into a vein (usually in the arm inside of the elbow or on the back of the hand)
Pull the blood sample into a vial or syringe
Take off the elastic band and remove the needle from the vein

2. What are the risks associated with this test?

Very few risks are associated with having blood drawn for an HBsAg test. However, if you have a bleeding disorder, you are at a slightly higher risk for excessive bleeding and hematoma (blood that accumulates under the skin).

There is a very small risk of infection at the puncture site. You may feel slightly faint or feel some soreness or pain at the site where your blood was drawn.

3. What are the symptoms of Hepatitis B?

Hepatitis B may be ordered when someone has signs and symptoms associated with acute hepatitis. Some of these include:

Fever
Fatigue
Loss of appetite
Nausea, vomiting
Abdominal pain
Dark urine
Pale Stools
Joint pain
Jaundice

4. What is the mode of transmission of Hepatitis B virus?

Hepatitis B is transmitted through contact with contaminated food and body fluids. Sharing needles, syringes or equipment with contaminated blood can transfer the virus from one person to another.

5. How Can Hepatitis B be prevented?

The mode of prevention is through vaccination.

A Reactive or Positive HBsAg test result means that the person is infected with Hepatitis B virus, and further testing is required to determine if the state is acute or chronic.

A Non-reactive or Negative HBsAg test result means

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Certeza Adult Size Inner-spring Deluxe Dual Head Stethoscope - CR-747ss

HBsAg Lab Test

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