Why is a growth hormone test 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.
How is a growth hormone test done?
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.
How do you prepare for a growth hormone test?
In general, there's nothing you have to do before this test, unless your doctor tells you to.
What do the results of a growth hormone test mean?
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 or acromegaly 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, kidney disease, or starvation. These conditions do not cause high IGF-1 levels.
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