Growth Hormone (GH) Monitoring via Pituitary-Normalized Assay
This test measures your growth hormone levels using a specialized method that accounts for natural variations in your pituitary gland’s activity. It helps doctors assess whether your growth hormone production is within expected ranges, especially important for diagnosing conditions like growth hormone deficiency or excess.
["This test helps track growth hormone health and supports diagnosis of hormonal imbalances."]
Key facts at a glance
- LOINC
- 85038-8
- Short code
- Somatotropin monitor Pnl
- Synonyms
- Somatotropin monitor Pnl
- 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 This Test Is Done
Your doctor may recommend this test if you have symptoms of abnormal growth hormone levels, such as slow growth in children, unusual weight changes, or metabolic issues. It’s also used in monitoring conditions like acromegaly (excess growth hormone) or pituitary disorders. Sometimes, it’s part of a broader evaluation for unexplained growth or development problems.
How the Test Works
The test uses a specialized immunoassay method that normalizes for pituitary activity, meaning it accounts for natural fluctuations in your body’s own growth hormone production. Blood is drawn, and the sample is analyzed in a lab to measure your GH levels relative to expected baseline values.
Sample Collection and Preparation
A blood sample is taken from a vein in your arm. You may feel a slight pinch when the needle is inserted, but it usually doesn’t cause discomfort afterward. The sample is sent to a lab for processing and testing.
What to Expect Before the Test
No special preparation is needed for this test. However, if you’re taking medications that affect hormones, your doctor may advise you to stop them temporarily or adjust your schedule. Always follow your healthcare provider’s instructions.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal results can indicate conditions like growth hormone deficiency (low levels) or acromegaly (high levels). Low levels may cause stunted growth, weakness, or metabolic issues, while high levels can lead to organ enlargement, diabetes, or joint pain. This test helps guide treatment decisions, such as hormone replacement therapy or medication adjustments.
Short name
GH Monitoring
Frequently asked questions
What Does a Normal Result Mean?
Can Diet or Exercise Affect This Test?
How Often Should This Test Be Done?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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