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Test Code 9567 Insulin-Like Growth Factor 1 (IGF1), Blood

Performing Laboratory

St. Louis Children's Hospital

Last Reviewed

January 2016


Reference Range:

Age Males Females UOM
<8 years: 50-300 50-300 ng/mL
8-10 years: 70-400 70-400 ng/mL
10-11 years: 70-400 100-450 ng/mL
11-12 years: 100-500 120-600 ng/mL
12-13 years: 150-700 150-700 ng/mL
13-14 years: 200-900 200-800 ng/mL
14-16 years: 200-1000 200-900 ng/mL
16-17 years: 200-900 200-800 ng/mL
17-18 years: 150-800 200-700 ng/mL
18-19 years: 150-650 150-550 ng/mL
19-20 years: 150-550 150-450 ng/mL
20-30 years: 100-350 100-350 ng/mL
30-40 years: 100-300 100-300 ng/mL
>40 years: 100-250 100-250 ng/mL

Critical Values: NA
Limitations: Heterophilic antibodies in human serum can react with the immunoglobulins included in the assay components causing interference with in vitro immunoassays. Samples from patients routinely exposed to animals or animal serum products can demonstrate this type of interference potentially causing an anomalous result. For diagnostic purposes, the results obtained from this assay should always be used in combination with the clinical examination, patient medical history, and other findings.
Methodology: Solid-phase Enzyme-labeled chemiluminescent immunometric assay

General Information

KIDDOS order name: Insulin Like Growth Factor 1
Cerner order name: IGF1
CPT Codes: 84305
LOINC Value: In process
Synonyms: Somatomedin C; IGF1

Specimen Requirements

Specimen Type: Blood


Preferred: Plain, red-top Vacutainer

Acceptable: Gold/Red SST Vacutainer


Collection Volume: 2.0 mL (minimum 0.5 mL)


Patient Preparation: None


Sample Rejection:

Specimens that are grossly hemolyzed.
Mislabeled or unlabeled specimens.


Special Instructions: None


Test Availability: Daily
Test set-up: Tuesday and Friday
Cut-off time: 01:00 a.m.
Turnaround Time: 1-3 days
Lab Testing Section: Chemistry

Lab Dept

Core Lab

Additional Information

For SLCH Laboratory use only


Lab Processing instructions: Centrifuge specimen to separate. Aliquot serum into conical plastic vial and place in freezer.
Processed Volume: 0.5 mL (minimum 0.2 mL) serum
Analyte Stability:

Ambient: 24 hours
Refrigerated: 24 hours
Frozen: 12 months
Notes: 1. Reject due to gross hemolysis (mild okay)

Barnes-Jewish Hospital Additional Information:
For BJH Laboratory Use Only
Laboratory Processing Instructions:
BJH Chemistry will forward to the performing laboratory.