IGF-1

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Also known as: Somatomedin C
Formal name: Insulin-like Growth Factor-1
Related tests: Growth Hormone (GH), Glucose, Glucose Tolerance Test, GH Stimulation Test

At a Glance

Why Get Tested?

To identify diseases and conditions caused by deficiencies and overproduction of growth hormone (GH), to detect disease of the pituitary gland, and to monitor the effectiveness of growth hormone replacement treatment

When to Get Tested?

As part of an evaluation of pituitary function;
1. when you are growing more slowly than normal, have short stature, have delayed development (in children) or decreased bone density, reduced muscle strength, and increased lipids (in adults), all of which suggest insufficient GH and IGF-1 production
2. when you have symptoms of gigantism (in children) or acromegaly (in adults) that suggest excess GH and IGF-1 production
3. during and after treatment for GH abnormalities

Sample Required?

A blood sample taken from a vein in your arm

Test Preparation Needed?

In general, no test preparation is needed; however, since this test may be performed at the same time as others, fasting for at least 12 hours may be required.