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Test Name:
Insulin-Like Growth Factor I


  • SBMF No:
    30053
  • Performance Lab Name:
    TMF Chemistry and Immunoassays
  • Test Mnemonic:
    IGF-1
  • CPT Code:
    84305
  • Also Known As:
    IGF-1; IGF-I; Somatomedin C
  • Spec Collect:
    Gold top (SST) or Red top (serum) tube. Mix by inverting tube 5 times. Also acceptable: Green top (heparin) tube.
  • Spec Process:
    Allow serum specimen to clot completely at room temperature. Centrifuge to separate from cells and transfer 1 mL serum or plasma to a plastic transport tube. (Min: 0.5 mL)
  • Spec Store Transport:
    Frozen.
  • Spec Stability:
    After separation from cells:
    Room temperature: Unacceptable
    Refrigerated: 24 hours
    Frozen: 1 year
  • Spec Reject:
    Non-frozen specimens. Hemolyzed specimens.
  • Methodology:
    Quantitative Chemiluminescent Immunoassay (ChLIA)
  • Use:
    Aids in diagnosis of growth hormone excess or deficiency disorders.
  • Interpretive Data:
    IGF-1 values well above the age and gender matched reference interval indicate a possible pituitary tumor secreting growth hormone. IGF-1 values below the reference interval indicate a possible GH deficiency.
  • Additional Test Info:
    Lab Tests Online
  • Day Run:
    Mon, Thu
  • Time Run:
    8:00 am
  • Time Reported:
    5:00 pm
  • Test Type:
    HORMONE