Sample Requirements:
SST and red top tubes
Purpose:
Helps uncover the biochemical or hormonal basis of fatigue. Measures thyroid hormones (TSH, Free T4), cortisol, DHEA-S, B12, and iron. Often used in evaluating chronic fatigue syndrome and adrenal fatigue.
Reference Range:
TSH: 0.45–4.5 µIU/mL; Cortisol (AM): 6–23 mcg/dL; DHEA-S: 35–430 µg/dL; B12: 200–900 pg/mL; Iron: 50–170 µg/dL