1 – Program overview

This external quality assessment program evaluates the accuracy of urinary free cortisol assays.

2 – Assessment frequency

Number of surveys per year: 4
Number of control samples per survey: 2
Number of samples per year: 8

3 – List of analytes assessed 

• Free cortisol
• Urinary creatinine

4 – Description of the control samples

Lyophilised human control urine (samples to be resuspended in 1 mL of distilled water).