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Growth Hormone (Serum) with Stimulation by GHRP-2 (GHRH Analog)

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

This test measures your body’s response to a growth hormone-releasing peptide to check if your pituitary gland produces enough growth hormone.

Quick summary

["Assesses pituitary function and potential growth hormone deficiencies or excesses."]

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

Key facts at a glance

LOINC
95851-2
Short code
GH p Macimorelin Stil Pnl Ser IA
Synonyms
GH p Macimorelin Stil Pnl Ser IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
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, or unexplained weight gain. It’s also used to diagnose conditions like acromegaly (excess growth hormone) or growth hormone deficiency.

How the Test Works

You’ll receive a growth hormone-releasing peptide (GHRP-2) injection, and blood samples are taken before and after to measure your growth hormone levels over time.

What to Expect Before the Test

No special preparation is needed, but avoid caffeine or stress before testing. Wear comfortable clothes and bring your medications list if prescribed.

During the Test

Blood samples are drawn at set intervals (e.g., before and after stimulation) to track hormone changes. You’ll remain seated comfortably during this process.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal results may indicate pituitary disorders, such as insufficient or excessive growth hormone production. Low levels could suggest deficiency, while high levels may point to conditions like acromegaly or tumors affecting hormone regulation.

Short name

Growth Hormone Stimulation Test

Frequently asked questions

How long does the test take?
The test itself takes about 1–2 hours, including blood draws. Your doctor will schedule follow-up visits if needed to interpret results.
What are typical results?
Results are compared to your baseline and response to stimulation. Your doctor will discuss findings in relation to your symptoms and medical history.
Can I eat or drink before the test?
Yes, you can eat a normal meal, but avoid caffeine or alcohol before testing to avoid influencing hormone levels.
  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