Ordering Recommendation
GH 120

Quantitative Chemiluminescent Immunoassay




1-2 days

New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation

Plasma separator tube or serum separator tube. Collect one tube per timed specimen. Also acceptable: Green (sodium or lithium heparin) or lavender (EDTA), or pink (K2EDTA).

Specimen Preparation

Allow specimen to clot completely at room temperature.  Separate serum or plasma from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma per timed specimen to individual ARUP Standard Transport Tubes. (Min: 0.4 mL per timed specimen)

Storage/Transport Temperature

Frozen. Also acceptable: Refrigerated.

Unacceptable Conditions

Tissue or urine. Grossly hemolyzed or lipemic specimens.


24 hours; Refrigerated: 1 week; Frozen: 2 months

Reference Interval
Interpretive Data

Growth hormone stimulation tests should induce a peak of greater than 5 ng/mL in children and greater than 4 ng/mL in adults; lower values suggest growth hormone deficiency. For children, some experts consider values of 5-8 ng/mL equivocal and only peak values of greater than 8 ng/mL as truly normal.

For suppression testing, normal subjects have growth hormone concentrations of less than 0.8 ng/mL within 2 hours of ingestion of a 75 or 100 gram glucose dose. Patients with acromegaly fail to show normal suppression.

No compliance statements are in use for this test.


This Growth Hormone assay is now standardized to the Recombinant Second International Standard (IS): 98/574. Growth hormone results read approximately 25 percent lower than with the previous standards (First IS: 80/505). Reference ranges have also been modified according to the assay manufacturer.

Hotline History
CPT Codes


Component Test Code* Component Chart Name LOINC
0070164 Growth Hormone 120 Minutes 14144-0
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
  • GH
  • GH testing
  • GHRH
  • Growth Hormone Provocative Test
  • Growth Hormone Stimulation
  • growth hormone, Serum
  • hGH
  • Human Growth Hormone
  • Somatotrophic Hormone
  • Somatotropin
Growth Hormone, 120 Minutes