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Growth Hormone (Iodinated) – Mass Concentration in Serum

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

This test measures the amount of a labeled form of growth hormone in your blood, often used to assess hormone function or response to treatment.

Quick summary

["Helps track growth hormone levels for medical evaluation or treatment monitoring."]

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

Key facts at a glance

LOINC
95849-6
Short code
GH 45M p Macimorelin Ser IA-mCnc
Synonyms
GH 45M 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

What Is This Test Measuring?

Growth hormone (GH) is a hormone produced by the pituitary gland that plays a key role in growth, metabolism, and cell repair. This test uses a radioactive iodine label to detect GH in your serum, helping doctors evaluate its presence or changes over time.

Why Might You Need This Test?

Your doctor may order this test if you have suspected growth hormone deficiency, pituitary disorders, or to monitor treatment effectiveness (e.g., for conditions like dwarfism or metabolic disorders). It may also be used in research or specialized clinical settings.

How Is the Sample Collected?

A blood sample is drawn from a vein, typically in your arm. The sample is then processed to separate serum, which is sent for analysis. You may experience slight discomfort, but it usually lasts a few minutes.

What Are Common Uses?

This test is primarily used in research or specialized clinical studies to measure GH levels with high precision. It may not be part of routine diagnostic panels for most patients.

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.

While this test provides detailed measurement of GH, its clinical relevance is limited to research or niche diagnostic scenarios. Standard GH assays (without iodine labeling) are more commonly used for routine evaluation of growth hormone disorders.

Short name

Iodinated GH Serum

Frequently asked questions

Why would my doctor request this specific test over a standard GH test?
This test may be used in specialized research settings, advanced diagnostic studies, or when high sensitivity is required (e.g., detecting very low GH levels). Standard GH assays are more commonly used for general clinical purposes due to broader availability and simpler interpretation.
How long will it take to get results from this test?
Results may take several days to weeks, depending on the lab’s processing schedule and whether it’s part of a research study. Your doctor will contact you with the outcome once available.
Is this test painful or invasive?
The blood draw itself is minor and temporary, but the iodine labeling process (if applicable) may require additional handling by the lab. Most patients experience no additional discomfort beyond standard venipuncture.
  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