Question:hard
The gold standard for definitive diagnosis of extrahepatic biliary atresia is
The gold standard for definitive diagnosis of extrahepatic biliary atresia is
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Per-operative cholangiography directly visualizes the biliary tree and confirms the block; scintigraphy only screens.
Updated On: Jul 8, 2026
- Per-operative Cholangiography
- Hepatobiliary Scintigraphy
- Alkaline Phosphatase Level
- Liver Biopsy
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The Correct Option is A
Solution and Explanation
Step 1: Rank the four tests by how directly they answer the question.
Alkaline phosphatase only tells us that some kind of cholestasis is present, nothing more, so it is the weakest test here.
Step 2: Place scintigraphy next.
The HIDA scan is a functional test. It picks up the tracer well in the liver but fails to show it in the gut when the duct is blocked. The catch is that severe hepatocellular disease can also block tracer excretion without any true duct blockage, so this test screens rather than confirms.
Step 3: Place liver biopsy next.
A biopsy examines the tissue directly and picks up features like bile duct proliferation and portal tract fibrosis. It is highly accurate, close to 90 to 95 percent, but it is still an indirect, pattern based read, not a direct look at the duct itself.
Step 4: Place per-operative cholangiography at the top.
This test injects dye straight into the biliary system during surgery and takes a live X-ray picture. If dye reaches the duodenum, the ducts are open. If it does not, the diagnosis of biliary atresia is confirmed on the spot. This is a direct anatomical answer, not an indirect inference, so it is the gold standard.
Step 5: State the answer.
Even though the original key names scintigraphy, direct visualization by per-operative cholangiography is the accepted gold standard in current practice.
\[ \boxed{\text{Per-operative Cholangiography}} \]
Alkaline phosphatase only tells us that some kind of cholestasis is present, nothing more, so it is the weakest test here.
Step 2: Place scintigraphy next.
The HIDA scan is a functional test. It picks up the tracer well in the liver but fails to show it in the gut when the duct is blocked. The catch is that severe hepatocellular disease can also block tracer excretion without any true duct blockage, so this test screens rather than confirms.
Step 3: Place liver biopsy next.
A biopsy examines the tissue directly and picks up features like bile duct proliferation and portal tract fibrosis. It is highly accurate, close to 90 to 95 percent, but it is still an indirect, pattern based read, not a direct look at the duct itself.
Step 4: Place per-operative cholangiography at the top.
This test injects dye straight into the biliary system during surgery and takes a live X-ray picture. If dye reaches the duodenum, the ducts are open. If it does not, the diagnosis of biliary atresia is confirmed on the spot. This is a direct anatomical answer, not an indirect inference, so it is the gold standard.
Step 5: State the answer.
Even though the original key names scintigraphy, direct visualization by per-operative cholangiography is the accepted gold standard in current practice.
\[ \boxed{\text{Per-operative Cholangiography}} \]
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