Since there are many critical functions that are different among males and females, different hormones play different roles. For example, among men, the three main hormones are testosterone, growth hormone and cortisol. Testosterone is needed for sex drive, bone density, muscle mass and fat distribution. Cortisol regulates blood pressure, sugar levels, information, and metabolism. The growth hormone controls metabolism and muscle and bone growth. Among women, the main hormones are estrogen, testosterone, and progesterone. Estrogen helps develop and maintain the reproductive system. It also maintains cognitive health, bone health and various cardiovascular systems. Testosterone, which is in smaller amounts compared to men, plays a similar role. Progesterone prepares the reproductive organs during conception through delivery. Low progesterone can sometimes increase the levels of estrogen, and this creates a hormonal imbalance. Since both men and women have different physical needs, their hormonal imbalances are also different and hence, there may be different hormone tests recommended for males and females.