In human biology, the<unk>  describes the<unk>  between<unk> , the primary male sex hormone and an anabolic steroid, and<unk> , another steroid hormone, in the human body. The<unk>  is often used as a biomarker of physiological stress in athletes during training, during athletic performance, and during recovery, and has been explored as a predictor of performance. At least among weight-lifters, the<unk>  tracks linearly with increases in training volume over the first year of training but the relationship breaks down after that. A lower<unk>  in weight-lifters just prior to performance appears to predict better performance. The<unk>  has been studied as a possible biomarker for criminal aggression, but as of 2009 its usefulness was uncertain.
Testosterone-cortisol ratio
Free androgen index
Thyroid hormone binding ratio
Combined rapid anterior pituitary evaluation panel
ACTH stimulation test
Dexamethasone suppression test
Aldosterone-to-renin ratio
Thyroid-stimulating hormone