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Growth Hormone (GH) with Immunoassay Measurement (24-hour profile)

Published: August 9, 2026Updated: August 17, 2026

This test measures your body’s natural production of growth hormone over a 24-hour period to help diagnose conditions related to low or high hormone levels.

Quick summary

["A 24-hour GH test helps doctors understand if your growth hormone levels are too low or too high, which may affect growth, metabolism, or other health issues."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
95848-8
Short code
GH 60M p Macimorelin Ser IA-mCnc
Synonyms
GH 60M p Macimorelin Ser IA-mCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
0
Ref high
17
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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 This Test Is Done

Your doctor may order this test if you have symptoms like slow growth in children, muscle weakness, fat redistribution, or metabolic problems. It’s also used to check for conditions like pituitary gland issues or growth hormone resistance.

What to Expect Before the Test

You’ll typically have blood drawn at different times (often early morning and late at night) over 24 hours. Follow your doctor’s instructions about diet, exercise, and sleep to get accurate results.

How the Test Works

Blood samples are taken to measure growth hormone levels at specific intervals. The test uses an immunoassay method to detect and quantify the hormone in your blood.

What the Results Mean

Results help identify whether your growth hormone levels are consistently low or high. Abnormal patterns may indicate conditions like growth hormone deficiency, acromegaly, or other hormonal imbalances.

Reference range

NCBI: NSE 0-17 ng/mLN/A

Specimen: serum

No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

24-Hour GH Profile

Frequently asked questions

How long will it take to get my results?
Results are usually available within 1–3 business days, depending on your lab. Your doctor will discuss them with you during your follow-up visit.
Can I eat or drink anything before the blood draws?
Yes, but avoid caffeine, alcohol, or heavy meals near your scheduled blood draws. Follow your doctor’s specific instructions for the best results.
Is there anything I should avoid doing while taking this test?
Limit strenuous exercise, smoking, or stress during the 24-hour period. Avoid medications that may affect hormone levels unless approved by your doctor.
  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 17, 2026. · Read our editorial policy