clearance is a topic covered in the Taber's Medical Dictionary.

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(klēr′ăns )

1. In medicine, the rate of removal of a substance from the body, e.g. in feces, the urine, sweat, or exhaled gases.
SEE: renal clearance test
2. In emergency medicine, the use of assessment tools, radiologic images, and/or laboratory tests to determine that a patient is not at risk for a suspected illness or injury.

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