Direct Enzyme Immunoassay (EIA)
Growth Hormone Releasing Hormone is a 44 amino acid peptide produced primarily by the hypothalamus. It is a neurohumoral control for adenohypophyseal secretion of Growth Hormone. Other hypothalamic hormones have a stimulatory effect on pituitary hormones, but Growth Hormone Releasing Hormone has no known effect on other pituitary hormones. Somatostatin is the inhibitory counterpart of Growth Hormone Releasing Hormone. Growth Hormone Releasing Hormone has structural similarities with the Secretin-Glucagon family of gastrointestinal hormones. Growth Hormone Releasing Hormone has been isolated from pancreatic Islet Cells and various cancer tumor cells.
Levels of IR-GH-RH
Baseline range: 5-18 pg/mL
Levels in GH-RH Dysfunction:
Patients with acromegaly: up to 200 pg/mL
Patients with small cell lung carcinoma: up to 50 pg/mL
GH-RH secreting tumors: 200-10,000 pg/mL
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Days Test Performed
Monday - Friday
5 - 9 days
Soft Order Code
Mayo FIRGH (90161) (Interscience)
Looking to Order a Test?
We’ve provided helpful links to make ordering easy.
All specimens should be accompanied by a requisition.
Learn about how to properly label and where to ship specimens.
MLabs provides all the supplies necessary for the collection of specimens.
Visit our provider FAQ and learn about common questions to ordering tests.
Offsite Collection Instructions
Collect specimen in a red top or SST tube. Centrifuge, aliquot serum into a plastic vial and freeze.
3 mL serum
1 mL serum
Test sent to Mayo Medical Laboratories; performed by Interscience Institute.