Growth Hormone Blood Test (HGH)

The Growth Hormone Blood Test measures the level of human growth hormone (HGH) in your bloodstream. HGH is produced by the pituitary gland and plays a central role in growth, muscle and bone development, and the regulation of fat and sugar metabolism. This test is typically requested when your doctor suspects an imbalance, such as excess production (acromegaly or gigantism) or deficiency (growth failure in children, or adult growth hormone deficiency). It may also be used to investigate unexplained fatigue, changes in body composition, or to monitor response to treatment.

A simple blood sample is taken by a trained phlebotomist, usually in the morning after an overnight fast, as HGH levels fluctuate throughout the day and are influenced by sleep, stress, and exercise. Because of this natural variability, a single measurement is often interpreted alongside your clinical history and may be followed by additional dynamic testing if needed.

Biomarkers included

• Human growth hormone (HGH)

Why it matters

Growth hormone affects far more than height. It influences energy levels, muscle mass, bone strength, and how your body uses fat and glucose. Abnormal levels can be linked to conditions such as pituitary tumours, hypopituitarism, or acromegaly, and can have a significant impact on long-term health. Measuring HGH gives you and your doctor a clear starting point for understanding whether your symptoms may be related to a hormonal imbalance, and it helps guide the next steps in diagnosis or monitoring.