Best test to differentiative between medical and surgical jaundice is
**Core Concept**
The differential diagnosis of jaundice involves distinguishing between pre-hepatic (surgical) and post-hepatic (medical) causes. This requires a thorough understanding of the pathophysiology of bilirubin metabolism and its relationship with liver function. The Sulfobromophthalein (Bromsulphalein, BSP) retention test is a classic method used to differentiate between these two conditions.
**Why the Correct Answer is Right**
The BSP retention test is based on the principle that BSP is a substance that is excreted by the liver into the bile and then into the intestines. In post-hepatic jaundice, the liver is functioning normally, and BSP is excreted within 15 minutes. In pre-hepatic jaundice, the liver is not functioning properly, and BSP is retained in the blood for longer periods. This test is particularly useful in differentiating between obstructive (surgical) and non-obstructive (medical) causes of jaundice.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not specified and cannot be evaluated.
* **Option B:** While other tests like the serum bilirubin level and liver enzymes may be useful in diagnosing jaundice, they do not specifically differentiate between medical and surgical causes.
* **Option C:** This option is not a valid test for differentiating between medical and surgical jaundice.
**Clinical Pearl / High-Yield Fact**
The BSP retention test is a classic method for differentiating between medical and surgical jaundice, but it has largely been replaced by more modern imaging techniques like ultrasound and CT scans.
**Correct Answer: C. BSP retention test**