ARUP's Laboratory Test Directory

Growth Hormone, 90 Minutes : 0070084

Mnemonic: GH 90

Methodology: Quantitative Chemiluminescent Immunoassay
Performed: Sun-Sat
Reported: 1-2 days
Specimen Required: Collect: 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: Grossly hemolyzed or lipemic specimens.

Stability (collection to initiation of testing): Ambient: 24 hours; Refrigerated: 1 week; Frozen: 2 months
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 5-7 ng/mL equivocal and only peak values of greater than 7 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.
CPT Code(s): 83003
Cross References: Human Growth Hormone (Growth Hormone, 90 Minutes)
 
 

 

 

 
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