All of the following conditions cause an increase in AFP except?
**Core Concept**
Alpha-fetoprotein (AFP) is a major plasma protein produced by the yolk sac and fetal liver during pregnancy. Elevated levels of AFP can indicate fetal anomalies, liver disease, or certain types of cancer.
**Why the Correct Answer is Right**
AFP levels are typically increased in conditions involving liver dysfunction or regeneration, such as liver cirrhosis, hepatitis, or liver cancer. Hepatitis B and C infections can cause liver inflammation, leading to increased AFP production. Additionally, certain liver conditions like liver regeneration after liver resection or liver cancer can also elevate AFP levels.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as conditions like liver cirrhosis and liver cancer indeed cause an increase in AFP.
**Option B:** This option is incorrect as certain liver infections like hepatitis B and C also lead to elevated AFP levels.
**Option C:** This option is incorrect as liver regeneration after liver resection can also cause a rise in AFP levels.
**Clinical Pearl / High-Yield Fact**
Remember that elevated AFP levels can be associated with both benign and malignant conditions, making it essential to consider other diagnostic markers and clinical context when interpreting AFP results.
**Correct Answer: D.**