Final answer:
The normal portal vein diameter in a supine resting patient should be no more than 10mm. This measurement is key in diagnosing conditions related to portal hypertension.
Step-by-step explanation:
The question pertains to the normal measurement of the portal vein diameter in a patient in the supine resting position. The correct answer is b) 10mm in diameter. The portal vein is a vital vessel in the hepatic portal system that carries blood from the gastrointestinal tract and spleen to the liver.
It is important to monitor the size of the portal vein because an enlarged portal vein may indicate conditions such as portal hypertension, which can be associated with hypervolemia, hypovolemia, or liver cirrhosis. Proper assessment of portal vein diameter is crucial for diagnosing and managing these conditions.