ARUP's Laboratory Test Directory

Growth Hormone, 60 Minutes : 0070083

Mnemonic: GH 60

Methodology: Chemiluminescent Immunoassay
Performed: Sun-Sat
Reported: 1-2 days
Specimen Required: Collect:  One 4 mL plasma separator tube or serum separator tube.  Also acceptable: green (sodium or lithium heparin), lavender (EDTA), or pink (K2EDTA).

Transport:  1 mL serum or plasma per timed specimen at 2-8°C.  (Min: 0.4 mL per timed specimen)  Submit specimen in an ARUP Standard Transport Tube.

Remarks:  Allow specimen to clot completely at room temperature.  Separate serum or plasma from cells ASAP.

Unacceptable Conditions:  Grossly hemolyzed or lipemic specimens.

Stability:  After separation from cells: Ambient: 3 days; Refrigerated: 1 week; Frozen: 2 months
Interpretive Data: Growth hormone stimulation tests should induce a peak of greater than 7 ng/mL in children and greater than 5 ng/mL in adults; lower values suggest growth hormone deficiency.  For children, some experts consider values of 7-10 ng/mL equivocal and only peak values of  greater than 10 ng/mL as truly normal.

For suppression testing, normal subjects have growth hormone concentrations of less than 1ng/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
 
 

 

 

 
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