The Growth Hormone (GH) test is used to measure levels of growth hormone in the blood. Growth hormone is responsible for regulating growth and development and is primarily produced by the pituitary gland. This test is performed to diagnose a range of disorders related to body growth, such as growth hormone deficiency, which can lead to short stature in children, or excessive hormone secretion, which may cause conditions like gigantism or acromegaly. This test is usually conducted in specific cases, such as children showing delayed growth or adults experiencing unexplained changes in weight or body composition. The test may require fasting or multiple measurements throughout the day to obtain accurate hormone level readings.