A patient is being evaluated for jaundice and liver fibrosis. His AST=87 IU/mL and ALT=81 IU/mL. His serological tests are given below. Which of the following is the next step in the diagnosis? IgM Anti- HbcAg Non- reactive IgG Anti- HbcAg Reactive HbsAg Non-Reactive HBeAg Non-Reactive Anti-HCV Reactive
**Core Concept**
The patient's presentation of jaundice and elevated liver enzymes, along with serological tests indicating a non-reactive HbsAg and reactive Anti-HCV, suggests a possible case of chronic hepatitis C infection. The patient's non-reactive IgG Anti-HBcAg and non-reactive HBeAg further support this diagnosis by ruling out hepatitis B infection.
**Why the Correct Answer is Right**
The correct next step is to perform an HCV RNA PCR (polymerase chain reaction) to confirm the diagnosis of chronic hepatitis C infection. This test is essential as it can detect the presence of the HCV virus and determine the viral load. The HCV RNA PCR is a sensitive and specific test that can differentiate between acute and chronic infection. In chronic hepatitis C, the presence of the virus can lead to ongoing liver damage and fibrosis.
**Why Each Wrong Option is Incorrect**
**Option A:**
Performing an ultrasound of the liver would not be the next step in the diagnosis, as it is a non-specific test that may not provide any additional information about the cause of the patient's liver dysfunction.
**Option B:**
Ordering a liver biopsy would be an invasive procedure and is not typically the next step in diagnosing chronic hepatitis C. While a biopsy can provide information about the extent of liver fibrosis, it is usually reserved for patients with a diagnosis of chronic hepatitis C who have not responded to treatment.
**Option C:**
Performing an HBV DNA PCR would be unnecessary as the patient's non-reactive IgG Anti-HBcAg and non-reactive HBeAg suggest that the patient is not infected with hepatitis B.
**Option D:**
Ordering a liver function panel would not provide any additional information about the cause of the patient's liver dysfunction, as the patient's AST and ALT levels are already elevated.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that chronic hepatitis C infection can be asymptomatic for many years, and the only way to diagnose it is through serological tests and viral load measurements.
**Correct Answer:** B.