Laboratory Test Information Guide

Details for Growth Hormone, Plasma/Serum

Test Name: Growth Hormone, Plasma/Serum
Alternate Name(s): Human Growth Hormone
Laboratory: Core
Specimen Type: Adult:
4.5 mL Light Green (Li-Heparin) top Vacutainer tube

0-2 years: 0.5 mL Light Green top (Li-Heparin) Microtainer
2-10 years: 3 mL Light Green top (Li-Heparin) Vacutainer tube

Red, Gold, or Lavender (EDTA) top tubes are also acceptable
Collection Information: Minimum volume of plasma or serum required is 700 L for adult samples or 200 L for pediatric samples.
Test Schedule: Monday - Friday
Turnaround time from when specimen
is received in testing laboratory:
5 days
Reference Range: Male:
0 10 years: ≤ 6.3 g/L*
11 17 years: ≤ 10.8 g/L*
21 77 years: ≤ 2.5 g/L*

0 10 years: ≤ 7.8 g/L*
11 17 years: ≤ 8.1 g/L*
21 77 years: ≤ 9.9 g/L*

*Basal levels of growth hormone do not have diagnostic relevance. Stimulation or suppression tests are needed to diagnose a growth hormone-related disorder.

Children: ≥ 6 g/L following provocative testing is not consistent with growth hormone deficiency
Effective Date: 2017-08-14
Revised Date: 2020-08-19
Critical Value:  
Interpretive Comments: 
Special Processing:  
Comments: Biotin may interfere with this test. Samples should not be taken from patients receiving high biotin doses (i.e. > 5 mg/day) until at least 8 hours after the last biotin administration.

This assay is affected by pegvisomant (a highly selective growth hormone receptor antagonist).

This assay is not suitable for pregnant women due to cross-reactivity with placental growth hormone.
Method of Analysis: Roche Electrochemiluminescence
Critical Information Required:  
Storage & Shipment: Store and ship plasma or serum frozen.
System Codes: 
Referred To:  

Questions? Comments? Contact Laura Gopaul