Growth hormone (GH) testing is primarily used to identify growth hormone deficiency and to help evaluate pituitary glandfunction, usually as a follow-up to other abnormal pituitary hormone test results.

GH testing is also used to detect excess GH and to help diagnose and monitor the treatment of acromegaly and gigantism.

Growth hormone is essential for normal growth and development in children and helps regulate metabolism in both children and adults. The pituitary gland produces and releases GH into the blood in pulses throughout the day.