Test ID: FIRGH
Growth Hormone-Releasing Hormone (GH-RH)
Secondary ID 
A test code used for billing and in test definitions created prior to November 2011
NY State Approved Indicates the status of NY State approval and if the test is orderable for NY State clients.
Method Name A short description of the method used to perform the test
Direct Radioimmunoassay (RIA)
Reporting Name A shorter/abbreviated version of the Published Name for a test; an abbreviated test name
Aliases Lists additional common names for a test, as an aid in searching
Growth Hormone-Releasing (IR-GH-RH) FORWARD
Growth Hormone-Releasing Hormone (IR-GH-RH) FORWARD
Specimen Type Describes the specimen type needed for testing
Specimen Required Defines the optimal specimen. This field describes the type of specimen required to perform the test and the preferred volume to complete testing. The volume allows automated processing, fastest throughput and, when indicated, repeat or reflex testing.
Submit only 1 of the following specimens:
Serum
Draw blood in a plain, red-top or serum gel tube(s). Separate
immediately and send 3 mL of serum frozen in a plastic vial.
Note: 1. Indicate serum on request form.
2. Label specimen appropriately (serum).
Plasma
Draw blood in a lavender-top (EDTA) tube(s). Separate
immediately and send 3 mL of EDTA plasma frozen in a plastic vial.
Note: 1. Indicate plasma on request form.
2. Label specimen appropriately (plasma).
Patient preparation;
Patient should not be on any medications that may
influence pituitary secretion.
Specimen Minimum Volume Defines the amount of specimen required to perform an assay once, including instrument and container dead space. Submitting the minimum specimen volume makes it impossible to repeat the test or perform confirmatory or perform reflex testing. In some situations, a minimum specimen volume may result in a QNS (quantity not sufficient) result, requiring a second specimen to be collected.
Reject Due To Identifies specimen types and conditions that may cause the specimen to be rejected
| Specimens other than | Serum, plasma |
| Anticoagulants other than | EDTA |
| Hemolysis | NA |
| Thawing | Warm reject; Cold reject |
| Lipemia | NA |
| Icteric | NA |
Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the laboratory. Alternate acceptable temperature(s) are also included.
| Specimen Type | Temperature | Time |
|---|---|---|
| Varies | Frozen | 365 days |
Clinical Information Discusses physiology, pathophysiology, and general clinical aspects, as they relate to a laboratory test
Growth Hormone Releasing Hormone is a 44 amino acid peptide
produced primarily by the hypothalamus. It si 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.
Reference Values Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.
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
This test was performed using a kit that has not been cleared or
approved by the FDA and is designated as research use only.
The analytic performance characteristics of this test have been
determined by Inter Science Institute. This test is not intended for
diagnosis or patient management decisions without confirmation
by other medically established means.
Test Performed by: Inter Science Institute
944 West Hyde Park Blvd.
Inglewood, CA 90302
Day(s) and Time(s) Test Performed Outlines the days and times the test is performed. This field reflects the day and time the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time required before the test is performed. Some tests are listed as continuously performed, which means assays are performed several times during the day.
Monday through Friday
Analytic Time Defines the amount of time it takes the laboratory to setup and perform the test. This is defined in number of days. The shortest interval of time expressed is "same day/1 day," which means the results may be available the same day that the sample is received in the testing laboratory. One day means results are available 1 day after the sample is received in the laboratory.
Maximum Laboratory Time Defines the maximum time from specimen receipt at Mayo Medical Laboratories until the release of the test result
Performing Laboratory Location The location of the laboratory that performs the test
Test Classification Provides information regarding the medical device classification for laboratory test kits and reagents. Tests may be classified as cleared or approved by the US Food and Drug Administration (FDA) and used per manufacturer's instructions, or as products that do not undergo full FDA review and approval, and are then labeled as an Analyte Specific Reagent (ASR), Investigation Use Only (IUO) product, or a Research Use Only (RUO) product.
CPT Code Information Provides guidance in determining the appropriate Current Procedural Terminology (CPT) code(s) information for each test or profile. The listed CPT codes reflect Mayo Medical Laboratories interpretation of CPT coding requirements. It is the responsibility of each laboratory to determine correct CPT codes to use for billing.
83519
LOINC® Code Information Provides guidance in determining the Logical Observation Identifiers Names and Codes (LOINC) values for the result codes returned for this test or profile.
| Result ID | Reporting Name | LOINC Code |
|---|---|---|
| Z0926 | Growth Hormone Releasing Hormone | In Process |
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