**Question:** A 23-year-old primigravida at 33 weeks of pregnancy presents with jaundice for 2 days. Her blood pressure is 140/90 mmHg, serum bilirubin is 5 mg%, Hb is 8 g/dL, platelet count is 90,000/cu.mm, TLC is 10,000/cu.mm, blood sugar is 40 mg/dL. AST and ALT were 85 and 80 IU/L respectively. What is the probable diagnosis?

**Core Concept:** Jaundice in pregnancy can be due to various causes. In this case, we need to consider the possibility of obstetric cholestasis (OC). OC is a pregnancy-specific liver disorder characterized by abnormal bile flow leading to elevated liver enzymes, hyperbilirubinemia (elevated serum bilirubin levels), and other laboratory abnormalities.

**Why the Correct Answer is Right:** The key features pointing to the diagnosis of obstructive jaundice are:

1. **Core Concept:** A pregnant woman presenting with jaundice in late pregnancy (33 weeks) and a significant rise in serum bilirubin levels (5 mg%) and liver enzymes (AST and ALT at 85 and 80 IU/L respectively).
2. **Core Concept:** The patient is a 23-year-old primigravida at 33 weeks of pregnancy which makes it a pregnancy-specific liver disorder.
3. **Core Concept:** The absence of other causes like hepatitis, hemolysis, or choledochal cyst.

**Why Each Wrong Option is Incorrect:**

**Option A:** The patient has normal platelet count (90,000/cu.mm) ruling out the possibility of hemolysis as the cause of jaundice.

**Option B:** The patient's blood sugar level is within normal limits, making diabetes mellitus less likely as a cause for jaundice.

**Option C:** The patient's blood pressure is normal (140/90 mmHg) excluding preeclampsia as the cause of jaundice.

**Option D:** Liver function tests (AST and ALT) are elevated, but not as high as in hepatitis. Hepatitis can still be a possibility, but the focus of this question is on obstructive jaundice due to OC.

**Correct Answer:** Given the patient's clinical presentation and laboratory findings, the most probable diagnosis is **obstructive jaundice due to obstructive cholestasis of pregnancy (OC).** OC is a pregnancy-specific liver disorder characterized by abnormal bile flow leading to cholestasis and elevated liver enzymes. The patient is a 23-year-old primigravida at 33 weeks gestation, which makes obstructive jaundice more likely than hepatocellular damage (e.g., hepatitis). The liver function tests (AST and ALT) are elevated but not as high as in hepatitis.

**Why Each Wrong Option is Incorrect:**

**Option A:** The platelet count is normal (