What is it?

A routine STI (Sexually Transmitted Infection) screen with Hepatitis B typically involves blood tests to check for both infections. Here's a breakdown of what you might expect:

Tests Included:

• Hepatitis B Tests:

  • Hepatitis B surface antigen (HBsAg): This test detects the presence of the Hepatitis B virus on the surface of infected liver cells. A positive HBsAg indicates current or recent infection.

  • Hepatitis B surface antibody (HBsAb): This test detects antibodies your body produces in response to a Hepatitis B infection. A positive HBsAb can indicate:

    • Past infection with and recovery from Hepatitis B (immunity)

    • Vaccination against Hepatitis B (immunity)

  • Hepatitis B core antibody (HBcAb): This test detects antibodies against the core of the Hepatitis B virus.

    • A positive HBcAb with a negative HBsAg usually indicates a past infection and immunity.

    • A positive HBcAb with a positive HBsAg suggests chronic infection.

• Syphilis Blood Test (Optional):  While not always included in a routine STI screen, some doctors may recommend a syphilis test alongside Hepatitis B depending on your risk factors and sexual practices. This would typically involve the two-step process mentioned previously:

  • Non-treponemal test (e.g., RPR or VDRL)

  • Treponemal test (e.g., FTA-ABS) if the non-treponemal test is positive.