Routine abdomen positioning

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Last updated 3:02 PM on 9/26/26
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18 Terms

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AP supine abdomen (KUB) patient position
Patient lies supine with the midsagittal plane centered to the table and IR.
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AP supine abdomen (KUB) SID
40 inches.
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AP supine abdomen (KUB) CR angle
Perpendicular, 0°.
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AP supine abdomen (KUB) CR location
MSP at the level of the iliac crest.
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AP supine abdomen (KUB) breathing instruction
Suspend respiration at the end of expiration.
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What anatomy must be included on an AP supine abdomen (KUB)?
The entire abdomen inferiorly through the pubic symphysis so the urinary bladder is included.
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Why must the pubic symphysis be included on an AP supine abdomen?
To ensure the urinary bladder and entire lower abdomen are included.
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AP upright abdomen patient position
Patient is positioned erect with the midsagittal plane centered to the IR.
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AP upright abdomen SID
40 inches.
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AP upright abdomen CR angle
Perpendicular, 0°.
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AP upright abdomen CR location
MSP approximately 2 inches above the iliac crest.
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AP upright abdomen breathing instruction
Suspend respiration at the end of expiration.
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What anatomy must be included on an AP upright abdomen?
Both hemidiaphragms and as much of the abdomen as possible.
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What is the primary purpose of an AP upright abdomen?
To demonstrate free intraperitoneal air and air-fluid levels.
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What is the easiest positioning difference between AP supine and AP upright abdomen?

AP supine is centered at the iliac crest and must include the pubic symphysis; AP upright is centered about 2 inches above the iliac crest and must include the diaphragms.

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An AP abdomen image includes both diaphragms but clips the pubic symphysis. Is this acceptable for an upright abdomen?
Yes. The diaphragms are the priority because the upright view is used to demonstrate free air and air-fluid levels.
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Why is respiration suspended on expiration for routine abdomen projections?
Expiration moves the diaphragm upward, helps elevate abdominal contents, and reduces motion.
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A technologist centers at the iliac crest for an AP upright abdomen. What positioning error has occurred?
The CR is too low; the upright abdomen should be centered approximately 2 inches above the iliac crest to include the diaphragms.