Dihydrotestosterone (DHT) is tested to measure levels of Dihydrotestosterone in the blood. Dihydrotestosterone (DHT) is a male hormone which is responsible for testicular dysfunction, it can also contribute to male baldness.
DHT is a potent androgen derived from testosterone via 5-alpha-reductase activity. 5-alpha-reductase deficiency results in incompletely virilized males (phenotypic females). This diagnosis is supported by an elevated ratio of testosterone to DHT.