A 33-year-old nurse suffered a needle stick injury. The patient used illicit intravenous drugs. One month later, the nurse developed jaundice. Which of the following finding would implicate hepatitis B as the etiology
**Core Concept**
Hepatitis B virus (HBV) infection can lead to acute or chronic liver disease, resulting in jaundice due to elevated bilirubin levels. The nurse's exposure to the patient's blood through a needle stick injury poses a risk of HBV transmission.
**Why the Correct Answer is Right**
HBV serological markers can help diagnose the infection. The presence of the hepatitis B surface antigen (HBsAg) indicates an active infection. HBsAg typically appears 1-3 months after exposure and remains detectable for up to 6 months. If the nurse has developed jaundice and is HBsAg positive, it would implicate hepatitis B as the etiology of her liver dysfunction.
**Why Each Wrong Option is Incorrect**
**Option A:** Elevated liver enzymes (e.g., ALT, AST) alone do not specifically implicate hepatitis B, as these can be elevated in various liver conditions, including hepatitis A, C, and non-viral causes.
**Option B:** The presence of anti-HAV IgM antibodies would indicate an acute hepatitis A infection, not hepatitis B.
**Option C:** Anti-HCV antibodies indicate exposure to hepatitis C virus, but the clinical presentation and time frame do not align with the described scenario.
**Clinical Pearl / High-Yield Fact**
HBV transmission risk can be significantly reduced with post-exposure prophylaxis (PEP) involving hepatitis B immune globulin (HBIG) and/or vaccination with recombinant HBV vaccine, administered within 24-48 hours of exposure.
**Correct Answer:** A.