Hepatitis B surface antigen (HBsAg) is a protein found on the surface of the hepatitis B virus (HBV) that indicates an active HBV infection, meaning the person is infectious and can spread the virus

The Rapid Plasma Reagin (RPR) test, also known as the VDRL test, is a blood test used to screen for syphilis, a sexually transmitted infection (STI) caused by the bacterium Treponema pallidum. It detects non-specific antibodies produced by the body in response to the infection, helping to confirm or rule out a diagnosis and monitor treatment effectiveness.