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Growth Hormone (GH) by Immunoassay, Plasma

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

This test measures the amount of growth hormone in your blood plasma. Growth hormone is a hormone produced by your pituitary gland that plays a key role in growth, metabolism, and cell repair.

Quick summary

["GH levels help diagnose growth disorders, metabolic conditions, or pituitary gland issues."]

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

Key facts at a glance

LOINC
81837-7
Short code
GRHPR Mut Anl Bld/T
Synonyms
GRHPR Mut Anl Bld/T
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like slow growth in children, muscle weakness, or changes in body composition in adults. It might also be used to monitor treatment for conditions like acromegaly or growth hormone deficiency.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8 hours before the test. Bring any medications you’re currently taking to your appointment.

How the Test Is Done

A healthcare professional will draw blood from a vein in your arm. You may feel a slight pinch, but the procedure is quick and usually painless.

What the Results Mean

Results help determine if your growth hormone levels are too high or too low. Abnormal levels may indicate conditions that require further medical evaluation or treatment.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

GH Plasma

Frequently asked questions

What causes abnormal growth hormone levels?
Abnormal levels can result from pituitary gland tumors, genetic disorders, trauma to the brain, or certain medical treatments. Symptoms like unexplained weight changes, fatigue, or unusual growth patterns may signal the need for further evaluation.
How long does it take to get results?
Results are typically available within 1 to 3 business days, depending on your lab’s processing time. Your healthcare provider will discuss the findings with you during your follow-up visit.
Can I eat or drink before this test?
Yes, you can eat and drink normally unless instructed otherwise. Fasting is usually not required for this test unless specified by your provider.
  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