Prolactin, 15-Hour Post-RH (Recombinant Human) Serum Measurement
This test measures your prolactin hormone level in serum after a 15-hour period following administration of recombinant human growth hormone (RH). It helps evaluate conditions affecting hormone regulation.
["This test assesses prolactin levels after a controlled hormone stimulation to detect potential hormonal imbalances."]
Key facts at a glance
- LOINC
- 47729-9
- Short code
- Prolactin 1.5h p TRH IV SerPl-mCnc
- Synonyms
- Prolactin 1.5h p TRH IV SerPl-mCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 0.8
- Ref high
- 1.2
- Critical range
- — – 5 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 85610
- SNOMED
- 396252006
- 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 Is This Test Done?
Your healthcare provider may order this test if you have symptoms like unexplained galactorrhea (milk production in non-breastfeeding individuals), infertility, or signs of hormonal disorders. It can also be used to monitor prolactin-related conditions or rule out pituitary issues.
What Does the Test Involve?
You’ll receive a recombinant human growth hormone injection. Blood is drawn 15 hours later to measure prolactin levels in your serum. This timing helps assess how your body responds to the hormone.
What to Expect Before the Test
No special preparation is typically needed, but follow your provider’s instructions regarding diet, medications, or activity restrictions. Avoid smoking or caffeine before the test as it may affect hormone levels.
What to Expect During the Test
A healthcare professional will insert a needle into a vein in your arm or hand to draw blood. You may feel a brief pinch, but it usually doesn’t cause significant discomfort. The blood sample will be sent to a lab for analysis.
Reference range
INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A
Inform your healthcare provider if you are taking blood thinners. No special preparation required.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Elevated prolactin levels after RH stimulation can indicate pituitary tumors, hyperprolactinemia, or other conditions affecting hormone secretion. Low levels may suggest pituitary dysfunction or other rare hormonal disorders. This test helps diagnose and monitor conditions related to prolactin regulation.
Short name
Prolactin (15h post-RH)
Frequently asked questions
How long will it take to get my results?
What do my results mean?
Can I take anything before or after the test?
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