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Sniff test

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sniff test

at fluoroscopy, a test for diaphragmatic function; paradoxical motion of a hemidiaphragm when a patient sniffs vigorously shows phrenic nerve paralysis or paresis of the hemidiaphragm. If rapid upward movement of the diaphragm occurs on brisk sniffing in the supine position, it is highly suggestive of paralysis of the diaphragm.