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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:

    Age   Reference Range
    1‑7 days   0‑26 ng/mL
    7‑15 days   0‑41 ng/mL
    15 days‑1 year   55‑327 ng/mL
    1‑2 years   51‑303 ng/mL
    2‑3 years   49‑289 ng/mL
    3‑4 years   49‑283 ng/mL
    4‑5 years   50‑286 ng/mL
    5‑6 years   52‑297 ng/mL
    6‑7 years   57‑316 ng/mL
    7‑8 years   64‑345 ng/mL
    8‑18 years   Refer to Tanner Stage
    19‑20 years   141‑483 ng/mL
    20‑21 years   127‑424 ng/mL
    21‑25 years   116‑358 ng/mL
    26‑30 years   117‑329 ng/mL
    31‑35 years   115‑307 ng/mL
    36‑40 years   109‑284 ng/mL
    41‑45 years   101‑267 ng/mL
    46‑50 years   94‑252 ng/mL
    51‑55 years   87‑238 ng/mL
    56‑60 years   81‑225 ng/mL
    61‑65 years   75‑212 ng/mL
    66‑70 years   69‑200 ng/mL
    71‑75 years   64‑188 ng/mL
    76‑80 years   59‑117 ng/mL
    81‑85 years   55‑166 ng/mL

    Tanner Stages   Male   Female
    I63‑279 ng/mL   49‑342 ng/mL
    II75‑420 ng/mL   115‑428 ng/mL
    III94‑765 ng/mL   145‑760 ng/mL
    IV192‑861 ng/mL   244‑787 ng/mL
    V171‑814 ng/mL   143‑859 ng/mL

    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