The physical changes of puberty are usually obvious to a doctor during a routine physical exam. To confirm a diagnosis of precocious puberty, a child's doctor may order blood and urine tests to detect high levels of sex hormones. X rays of the wrist and hand can reveal whether the bones are maturing too rapidly. Imaging and scanning tests such as computerized tomography (CT) scans and magnetic resonance imaging (MRI) can help rule out specific causes of precocious puberty, such as a tumor in the pituitary gland, hypothalamus, brain, ovary, or testicle.

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