Testosterone is a male sex hormone (androgen) that helps male features develop. Testosterone is made in the testes in men, the ovaries in women, and in the adrenal glands.
Testosterone causes the changes that occur in boys during puberty. It helps hair, muscles, penis, and testes to grow. In adult males, it boosts sex drive and helps make sperm.
In women, the ovaries make small amounts of testosterone. It helps many organs and body processes in women.
No specific precaution/preparation required for this test.