Q:

A 35 year old primigravida post Cesarian-section complains of inability to void. She denies dysuria but complains of fullness. She was treated with an epidural for analgesia. What is the single most appropriate investigation?

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A 35 year old primigravida post Cesarian-section complains of inability to void. She denies dysuria but complains of fullness. She was treated with an epidural for analgesia. What is the single most appropriate investigation?


  1. MSU
  2. US abdomen
  3. US KUB
  4. Serum calcium

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The key is B. US abdomen. [C. US KUB. Is also correct! This is a case of POUR (post operative urinary

retention). We should do US to know the urinary volume (urine volume in bladder). If <400ml we shall

observe. When volume is >600ml we should do catheterization].

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