Growth Hormone, 120 Minutes




Test Mnemonic

GH120

CPT Codes

  • 83003 - QTY (1)

Includes

  • Growth Hormone 120 minutes

Performing Laboratory

ARUP


Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
1 mLSerumSST (Gold) FrozenSpecimen should be collected 120 minutes post dose of a 75 or 100 gram glucose dose. Separate serum from cells ASAP or within 2 hours of collection

Alternate Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
1 mLPlasmaEDTA (Lavender) FrozenSpecimen should be collected 120 minutes post dose of a 75 or 100 gram glucose dose. Separate serum from cells ASAP or within 2 hours of collection
1 mLPlasmaSodium or Lithium heparin (Green) FrozenSpecimen should be collected 120 minutes post dose of a 75 or 100 gram glucose dose. Separate serum from cells ASAP or within 2 hours of collection

Minimum Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
0.4 mL    Draw baseline specimen, then 30, 60 and 120 minutes post stimulation.

Stability

Environmental Condition Description
Ambient1 day
Refrigerated1 week
Frozen2 months

Days Performed

Sun - Sat

Turnaround Time

2 - 3 days

Methodology

Name Description
Chemiluminescence Immunoassay (CLIA) 

Reference Range

Special Info

Specimen should be collected 120 minutes post dose of a 75 or 100 gram glucose dose.

Clinical Info

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. 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