Sample Requirements:
SST or red top, collect in the morning (8–10 a.m.)
Purpose:
Measures both total and free testosterone levels for evaluation of androgens in males and females.
High Levels:
May be due to steroid use, PCOS, adrenal tumors.
Low Levels:
Suggests hypogonadism or androgen deficiency.
Reference Range:
Total: 300–1000 ng/dL (males); Free: 5–20 ng/dL