Insulin-like Growth Factor - 1

This a test to identify diseases and conditions caused by deficiencies and overproduction of growth hormone (GH), to evaluate pituitary function, and to monitor the effectiveness of GH treatment. It is done as a part of an evaluation of pituitary function; if you have symptoms of slow growth, short stature, and delayed development (in children) or decreased bone density, reduced muscle strength, and increased lipids (in adults) that suggest insufficient GH and IGF-1 production; if you have symptoms of gigantism (in children) or acromegaly (in adults) that suggest excess GH and IGF-1 production; during and after treatment for GH abnormalities. The insulin-like growth factor - 1 (IGF-1) test is an indirect measure of the average amount of growth hormone (GH) being produced by the body.

PREPARATION FOR TEST

A blood sample is obtained by inserting a needle into a vein in the arm.

NORMAL FINDINGS

  • Adult: 42-110 ng/mL

  • Child-0-8 years:

  • Girls: 5-128 ng/mL

  • Boys: 2-118 ng/mL

  • Child-9-10 years:

  • Girls: 24-158 ng/mL

  • Boys: 15-148 ng/mL

  • Child-11-13 years:

  • Girls: 65-226 ng/mL

  • Boys: 55-216 ng/mL

  • Child-14-15 years:

  • Girls: 124-242 ng/mL

  • Boys: 114-232 ng/mL

  • Child-16-17 years:

  • Girls: 94-231 ng/mL

  • Boys: 84-211 ng/mL

  • Child-18-19 years:

  • Girls: 66-186 ng/mL

  • Boys: 56-177 ng/mL

Ranges for normal findings may vary among different laboratories and hospitals. You should always check with your doctor after having lab work or other tests done to discuss the meaning of your test results and whether your values are considered within normal limits.

MEANING OF TEST

Your caregiver will go over the test results with you and discuss the importance and meaning of your results, as well as treatment options and the need for additional tests if necessary.

OBTAINING THE TEST RESULTS

It is your responsibility to obtain your test results. Ask the lab or department performing the test when and how you will get your results.