Serum Prolactin Level (Mass Concentration)
This test measures the amount of prolactin, a hormone produced by your pituitary gland, in your blood. Prolactin helps regulate breast milk production and influences other bodily functions.
["Prolactin levels can help diagnose hormonal imbalances or conditions affecting your pituitary gland."]
Key facts at a glance
- LOINC
- 47730-7
- Short code
- Prolactin 15M p TRH IV SerPl-mCnc
- Synonyms
- Prolactin 15M 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 This Test Might Be Ordered
Your healthcare provider may recommend this test if you have symptoms like breast changes, irregular menstrual periods, infertility, or unexplained headaches. It could also be part of an evaluation for conditions like hyperprolactinemia (high prolactin levels) or hypoprolactinemia (low prolactin levels).
What to Expect Before the Test
No special preparation is usually needed, but you may be asked to fast for a few hours before the test if instructed by your doctor. Wear comfortable clothing and plan to stay for about 15 minutes while the blood is drawn. Avoid smoking or consuming caffeine for at least 30 minutes before the test if possible.
During the Test
A healthcare professional will insert a small needle into a vein in your arm or hand to collect a blood sample. You may feel a slight pinch or discomfort, but it usually lasts only a few seconds. The blood is then sent to a lab for analysis.
After the Test
After the blood is drawn, the needle is removed, and a bandage is applied. You can usually return to your normal activities immediately. If you experience any unusual pain, swelling, or signs of infection at the site, contact your healthcare provider.
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.
High prolactin levels may indicate conditions such as a pituitary tumor, thyroid disorders, kidney problems, or certain medications (like antidepressants or antipsychotics). Low prolactin levels might suggest pituitary damage, pregnancy, or certain medical conditions. Your doctor will interpret the results in the context of your symptoms and medical history.
Short name
Prolactin
Frequently asked questions
How long will I have to wait for my results?
What are the common causes of abnormal prolactin levels?
Can I take my medications before 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