double void

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double void a technique of bladder training useful for those with urinary retention; the patient is taught to urinate, relax for five minutes, and repeat urination. A patient who is performing glucose examinations of the urine should test the second specimen.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

dou·ble void

(dŭbĕl voyd)
A urinalysis procedure in which the first sample is discarded; a second, obtained 30 to 45 minutes later, is tested.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012