medical decision support medical decision support
Sign In

World Anti-Doping Agency (WADA) Formula for Normalizing a Urine Drug Concentration Based on the Specific Gravity

Purpose: To normalize a urine drug level in a dilute specimen using the WADA formula and the urine specific gravity.

Description

The World Anti-Doping Agency (WADA) developed a formula that adjusts a drug concentration in dilute urine to a level that would be seen if the urine had a normal specific gravity. The formula was developed for tests measuring anabolic steroids but can be used for other drugs.


Specimen selection: specific gravity 1.001 to 1.004 (1.000 would indicate water)

 

Parameters:

(1) specific gravity of urine specimen

(2) concentration of the drug in urine in ng/mL (= mg/L)

 

estimated drug concentration in ng/mL if the urine had a specific gravity 1.020 =

= (1.020 - 1.000) / ((specific gravity of urine sample) - 1.000) * (urine drug concentration)


To read more or access our algorithms and calculators, please log in or register.

Specialty

Objective

ICD-10