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Test Name:
Insulin-Like Growth Factor I


  • SBMF No:
    30053
  • Performance Lab Name:
    ARUP Laboratories
  • Test Mnemonic:
    IGF-1
  • CPT Code:
    84305
  • Ref Lab Test No:
    0070125
  • Also Known As:
    IGF-1; IGF-I; Somatomedin C
  • Also See:
    IGF-1 Pubertal Ranges by Tanner Stage
  • Spec Collect:
    Gold top (SST) or Red top (serum) tube.
    Mix by inverting tube 5 times.
  • Spec Process:
    Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP Standard Transport Tube. (Min: 0.5 mL)
  • Spec Store Transport:
    Frozen.
  • Spec Stability:
    After separation from cells:
    Room temperature: 24 hours
    Refrigerated: 1 week
    Frozen: 1 year
  • Spec Reject:
    Plasma, tissue or urine. Grossly hemolyzed or lipemic specimens.
  • Methodology:
    Quantitative Chemiluminescent Immunoassay (ChLIA)
  • Use:
    Aids in diagnosis of growth hormone excess or deficiency disorders.
  • Reference Range:

    Age Female Male 
    1‑2 years
    3 years
    4 years
    5 years
    6 years
    7 years
    8‑18 years
    19‑20 years
    21‑30 years
    31‑40 years
    41‑50 years
    51‑60 years
    61‑70 years
    71‑80 years   
    56‑144 ng/mL
    26‑162 ng/mL
    32‑179 ng/mL
    39‑198 ng/mL
    55‑238 ng/mL
    55‑268 ng/mL
    Refer to Tanner Stages   
    217‑475 ng/mL
    87‑368 ng/mL
    106‑368 ng/mL
    118‑298 ng/mL
    53‑287 ng/mL
    75‑263 ng/mL
    54‑205 ng/mL
    30‑122 ng/mL
    20‑141 ng/mL
    25‑157 ng/mL
    30‑174 ng/mL
    37‑192 ng/mL
    44‑211 ng/mL
    Refer to Tanner Stages   
    281‑510 ng/mL
    155‑432 ng/mL
    132‑333 ng/mL
    121‑237 ng/mL
    68‑245 ng/mL
    60‑220 ng/mL
    36‑215 ng/mL

    Female Tanner Stages  
    I (8‑12 yrs) 64‑358 ng/mL 
    II (8‑14 yrs) 89‑566 ng/mL 
    III (9‑15 yrs) 192‑568 ng/mL 
    IV & V (11‑18 yrs)   147‑646 ng/mL 

    Male Tanner Stages  
    I (8‑15 yrs) 52‑391 ng/mL 
    II & III (8‑16 yrs) 39‑648 ng/mL 
    IV & V (11‑18 yrs)   144‑673 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:

    ARUP Consult | The Physician's Guide to Laboratory Test Selection and Interpretation

    Lab Tests Online: A public resource on clinical lab testing from the laboratory professionals who do the testing

    Online LIS Test Build Information is not available for this test. For a complete test mix, contact interface support at SBMF-FSI@sbmf.org.

  • Day Run:
    Sun-Sat (daily)
  • Time Reported:
    2-3 days
  • Test Type:
    HORMONE