Essential Biochemistry - Organ Function Tests (Section 1 - No. 39)
Prothrombin time in obstructive jaundice:
Decreases
Increases after parenteral injection of vitamin K
Normal
Normalizes after parenteral injection of vitamin K.
Explanation
Obstructive jaundice leads to reduced vitamin K absorption, increasing prothrombin time; injection of vitamin K corrects the deficiency.
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