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. Author manuscript; available in PMC: 2013 Dec 1.
Published in final edited form as: Drug Test Anal. 2012 Feb 24;4(12):912–922. doi: 10.1002/dta.394

Figure 3.

Figure 3

Isotopic calibration procedures for the Steroid Isotopic Standards (SIS) (CU/USADA 33-1 or CU/USADA 34-1), and the use of these SIS for the external calibrations of the steroids in a urine matrix in anti-doping tests, including work by Munton [68] and Kioussi [63].