Phlebotomy Essentials
6th Edition
ISBN: 9781451194524
Author: Ruth McCall, Cathee M. Tankersley MT(ASCP)
Publisher: JONES+BARTLETT PUBLISHERS, INC.
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The plasma concentration of a drug is 50 mg/L and is decreasing in first-order fashion with a half-life of 12 hours. Approximately how may hours will it take for the blood concentration to fall to a desired range of 10-15 mg/L?
(A) 12
(B) 24
(C) 36
(D) 48
(E) 50
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