insulin-like growth factor (IGF)-1 or somatomedin C in serum

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Indications

# children with low levels of IGF-1 may need growth hormone stimulation test to establish the diagnosis of growth hormone deficiency

Reference interval

  • 135-440 ng/mL, age = 26-85 years
  • Male: 202-433 ng/mL, age = 19-25 years
  • Female: 231-550 ng/mL, age = 19-25 years
  • Male: 134-836 ng/mL, age = 15-18 years
  • Female: 152-860 ng/mL, age = 15-18 years
  • Male: 165-616 ng/mL, age = 13-14 years
  • Females : 286-660 ng/mL, age = 13-14 years
  • Male: 136-440 ng/mL, age = 11-12 years
  • Female: 191-462 ng/mL, age = 11-12 years
  • Male: 136-385 ng/mL, age = 7-10 years
  • Female: 123-396 ng/mL, age = 7-10 years
  • Male: 16-288 ng/mL, age = 3-6 years
  • Female: 70-316 ng/mL, age = 3-6 years
  • Male: 31-160 ng/mL, age = 1-2 years
  • Female: 11-206 ng/mL, age = 1-2 years

amniotic fluid (< 12 weeks): undetectable

* Levels are higher in pregnancy

Increases

Decreases

Specimen

  • serum
  • freeze immediately
  • stable for 30 days

More general terms

Additional terms

References

  1. Clinical Guide to Laboratory Tests, 3rd ed. Teitz ed., W.B. Saunders, 1995
  2. IGF-1 (Insulin-Like Growth I) Laboratory Test Directory ARUP: http://www.aruplab.com/guides/ug/tests/0070125.jsp

Patient information

IGF1 in serum patient information