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HelpTest Code HGH Growth Hormone, Serum
Additional Codes
| Mayo Test ID |
|---|
| HGH |
Reporting Name
Growth Hormone, SUseful For
Diagnosis of acromegaly and assessment of treatment efficacy when interpreted in conjunction with results from glucose suppression test
Diagnosis of human growth hormone deficiency when interpreted in conjunction with results from growth hormone stimulation test
This test is not intended for use as a screen for acromegaly.
This test has limited value in assessing growth hormone secretion in normal children.
Method Name
Immunoenzymatic Assay
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
SerumOrdering Guidance
For assessing growth hormone secretion in normal children, the recommended test is IGFMS / Insulin-Like Growth Factor 1, Mass Spectrometry, Serum.
For acromegaly screening, the preferred test is IGFGP / Insulin-Like Growth Factor 1 and Insulin-Like Growth Factor-Binding Protein 3 Growth Panel, Serum.
Specimen Required
Patient Preparation: For at least 8 hours, patient should be fasting.
Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Specimen Volume: 0.6 mL
Collection Instructions:
1. If multiple specimens are collected, submit each vial under a separate order.
2. Label specimens appropriately with the corresponding collection times.
Specimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 7 days | |
| Frozen | 90 days |
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | OK |
Reference Values
Males:
2-<7 years:* 0.05-5.11 ng/mL
7-<12 years:* 0.02-4.76 ng/mL
12-<14 years:* 0.01-6.20 ng/mL
14-<18 years:* 0.02-3.81 ng/mL
≥18 years: 0.01-0.97 ng/mL
Females:
2-<7 years:* 0.05-5.11 ng/mL
7-<12 years:* 0.02-4.76 ng/mL
12-<14 years:* 0.01-6.20 ng/mL
14-<18 years:* 0.03-5.22 ng/mL
≥18 years: 0.01-3.61 ng/mL
*Source: Karbasy K, Lin DC, Stoianov A, et al. Pediatric reference value distributions and covariate-stratified reference intervals for 29 endocrine and special chemistry biomarkers on the Beckman Coulter Immunoassay Systems: a CALIPER study of healthy community children. Clin Chem Lab Med. 2016;54(4):643-657. doi:10.1515/cclm-2015-0558
Reference intervals for patients younger than 2 years have not been established.
For International System of Units (SI) conversion for Reference Values, see www.mayocliniclabs.com/order-tests/si-unit-conversion.html
Day(s) Performed
Monday through Saturday
CPT Code Information
83003
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| HGH | Growth Hormone, S | 2963-7 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| HGH | Growth Hormone, S | 2963-7 |
Clinical Information
The anterior pituitary secretes human growth hormone (hGH) in response to exercise, deep sleep, hypoglycemia, and protein ingestion. hGH stimulates hepatic insulin-like growth factor-1 and mobilizes fatty acids from fat deposits to the liver. Hyposecretion of hGH causes dwarfism in children. Hypersecretion causes gigantism in children or acromegaly in adults.
Because hGH levels in normal and diseased populations overlap, hGH suppression and stimulation tests are needed to evaluate conditions of hGH excess and deficiency; random hGH levels are inadequate.
Interpretation
Acromegaly: For suppression testing, normal subjects have a nadir human growth hormone (hGH) concentration below 0.3 ng/mL after ingestion of a 75-gram glucose dose. Patients with acromegaly fail to show normal suppression. Using the Access ultrasensitive hGH assay, a cutoff of 0.53 ng/mL for nadir hGH was found to differentiate patients most accurately with acromegaly in remission from active disease with a sensitivity of 97% (95% CI, 83%-100%) and a specificity of 100% (95% CI, 82%-100%).(1)
Deficiency: A normal response following stimulation tests is a peak hGH concentration above 5 ng/mL in children and above 4 ng/mL in adults. For children, some experts consider hGH values between 5 ng/mL and 8 ng/mL equivocal and only GH peak values greater than 8 ng/mL as truly normal. Low levels, particularly under stimulation, indicate hGH deficiency.
Cautions
As the human growth hormone (hGH) test has limited value in assessing growth hormone secretion in normal children, IGFMS / Insulin-Like Growth Factor 1, Mass Spectrometry, Serum is recommended as the first test for assessing deficient or excess growth during childhood and adolescent development. IGF1 reference intervals for Tanner stages are available. Suspected causes of dwarfism should be diagnosed with the aid of provocative testing.
Elevated levels of hGH indicate the possibility of gigantism or acromegaly but must be confirmed with stimulation and suppression testing.
Growth hormone is secreted in surges; single measurements are of limited diagnostic value.
Method Description
The instrument used is the Beckman Coulter UniCel DXI 800. The Access ultrasensitive human growth hormone (hGH) assay is a simultaneous one-step immunoenzymatic ("sandwich") assay. A sample is added to a reaction vessel along with polyclonal goat anti-hGH alkaline phosphatase conjugate and paramagnetic particles coated with mouse monoclonal anti-hGH antibody. The patient sample hGH binds to the monoclonal anti-hGH on the solid phase, while the goat anti-hGH-alkaline phosphatase conjugate reacts with a different antigenic site on patient sample hGH. After incubation in a reaction vessel, materials bound to the solid phase are held in a magnetic field while unbound materials are washed away. Then, the chemiluminescent substrate Lumi-Phos 530 is added to the vessel, and light generated by the reaction is measured with a luminometer. The light production is directly proportional to the concentration of hGH in the sample. The amount of analyte in the sample is determined from a stored, multi-point calibration curve.(Package insert: Access Ultrasensitive hGH Growth Hormone. Beckman Coulter Inc.; 05/2020)