Skip to content

Growth Hormone (GH) by Immunoassay (Serum/Plasma)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of growth hormone in your blood, which helps regulate growth, metabolism, and other bodily functions.

Quick summary

["Growth hormone levels can help diagnose conditions like growth disorders, metabolic issues, or pituitary problems."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
14177-0
Short code
GHRH SerPl-mCnc
Synonyms
GHRH SerPl-mCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your doctor may order this test to check for growth hormone deficiencies or excesses, especially in children who aren’t growing at the expected rate or adults experiencing unexplained weight changes, fatigue, or muscle weakness.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the test if it involves a blood draw. Bring any medications you’re taking to your appointment.

How the Test Works

A small sample of your blood (serum or plasma) is taken from a vein in your arm. The sample is then analyzed using an immunoassay method to measure the precise amount of growth hormone in your blood.

Possible Results and Next Steps

Results may be compared to standard ranges to identify whether your levels are too high or too low. Your doctor will discuss the results with you and may recommend further testing or treatments based on the findings.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

GH Level

Frequently asked questions

What causes abnormal growth hormone levels?
Growth hormone imbalances can result from pituitary gland disorders (such as tumors), genetic conditions, trauma to the head, or certain medical treatments (like radiation or chemotherapy). Lifestyle factors like poor nutrition or chronic stress may also play a role.
How often should I get this test?
Your doctor will determine the frequency based on your symptoms, medical history, and test results. Regular monitoring may be needed if you have a known condition affecting growth hormone levels.
Can diet or exercise affect this test?
Yes, certain foods (like protein-rich meals) and physical activity can influence growth hormone secretion. If your doctor suggests fasting before the test, follow their instructions to ensure accurate results.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy