ARUP's Laboratory Test Directory
| 0070164: Growth Hormone, 120 Minutes |
| Test Mnemonic: GH 120 | |
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Methodology: Chemiluminescent Immunoassay
Performed: Sun-Sat Reported: 1-2 days |
| Specimen Required: | |
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Collect: One 4 mL PST or SST. 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. Pediatric Collection/Transport: 0.4 mL serum or plasma per timed specimen at 2-8°C. Remarks: Allow specimen to clot completely at room temperature. Separate serum or plasma from cells ASAP. Stability: After separation from cells: Ambient: 3 days; Refrigerated: 1 week; Frozen: 2 months |
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| Interpretive Data: | |
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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 1 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 |