Quantitative Chemiluminescent Immunoassay
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).
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)
Frozen. Also acceptable: Refrigerated
Tissue or urine. Grossly hemolyzed or lipemic specimens.
Ambient: 24 hours; Refrigerated: 1 week; Frozen: 2 months
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.
|Component Test Code*||Component Chart Name||LOINC|
|0070083||Growth Hormone 60 Minutes||14146-5|
- GH testing
- Growth Hormone Provocative Test
- Growth Hormone Stimulation
- growth hormone, Serum
- Human Growth Hormone
- Somatotrophic Hormone