Growth Hormone Test
Test Overview
A growth hormone (GH) test measures the amount of human growth hormone, Opens dialog (GH) in the blood. GH is made by the pituitary gland, Opens dialog and is needed for growth. It plays an important role in how the body uses food for energy (metabolism, Opens dialog). The amount of GH in the blood changes during the day and is affected by exercise, sleep, emotional stress, and diet.
Too much GH during childhood can cause a child to grow taller than normal (gigantism, Opens dialog). Too little GH during childhood can cause a child to grow less than normal (dwarfism, Opens dialog). Both conditions can be treated if found early.
In adults, too much GH is caused by a noncancerous tumor of the pituitary gland (adenoma). Too much GH can cause bones of the face, jaw, hands, and feet to grow larger than normal (acromegaly, Opens dialog).
Growth hormone can cause the release of other substances (factors) that affect growth and metabolism. One of these is insulin, Opens dialog-like growth factor 1 (IGF-1). When the GH level is very high, the IGF-1 level is also very high. A test for IGF-1 may also be done.
A test for growth hormone (GH) is done to:
- See whether a child whose growth is abnormal has dwarfism or gigantism.
- See whether an adult has too much GH (acromegaly) or too little GH.
- Check treatment that uses growth hormone.
Blood levels of growth hormone (GH) can change quickly, so more than one blood sample may be taken on different days. Insulin-like growth factor 1 (IGF-1) levels change more slowly, and it may be the first test done.
A health professional uses a needle to take a blood sample, usually from the arm.
Watch
When a blood sample is taken, you may feel nothing at all from the needle. Or you might feel a quick sting or pinch.
There is very little chance of having a problem from this test. When a blood sample is taken, a small bruise may form at the site.
Normal
Each lab has a different range for what's normal. Your lab report should show the range that your lab uses for each test. The normal range is just a guide. Your doctor will also look at your results based on your age, health, and other factors. A value that isn't in the normal range may still be normal for you.
High values
- High GH values may mean gigantism, Opens dialog or acromegaly, Opens dialog is present. These conditions are caused by a noncancerous tumor in the pituitary gland (adenoma). Insulin-like growth factor 1 (IGF-1) levels should also be high.
- High GH levels may also be caused by diabetes, Opens dialog, kidney disease, or starvation. These conditions do not cause high IGF-1 levels.
Current as of: April 30, 2024
Author: Ignite Healthwise, LLC Staff
Clinical Review Board
All Ignite Healthwise, LLC education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.
Current as of: April 30, 2024
Author: Ignite Healthwise, LLC Staff
Clinical Review Board
All Ignite Healthwise, LLC education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.
