Prolactin Levels Blood Test
Prolactin Levels Blood Test is a laboratory test you can order directly. A prolactin levels blood test measures the amount of prolactin, a hormone made by the pituitary gland. It is ordered to evaluate irregular menstrual periods, nipple discharge, breast milk production when not breastfeeding, or fertility problems.
- Sample type
- blood
- Category
- Hormone
- Turnaround
- 1-3 business days
- Price
- $118
- Referral
- Not required
A prolactin levels blood test measures the amount of prolactin, a hormone made by the pituitary gland. It is ordered to evaluate irregular menstrual periods, nipple discharge, breast milk production when not breastfeeding, or fertility problems.
What it measures
- Prolactin — The main hormone measured; high levels can affect reproduction and milk production.
- Thyroid-stimulating hormone (TSH) — Sometimes checked because an underactive thyroid can raise prolactin.
- Estradiol — A form of estrogen that helps show if high prolactin is affecting ovarian function.
- Testosterone — Measured in men because high prolactin can lower testosterone.
Who it is for
A doctor may order this test if you have symptoms such as unexplained nipple discharge, missed or irregular periods, trouble getting pregnant, or low sex drive. It is also used to monitor known pituitary conditions.
Preparation
No fasting is usually required. Tell your healthcare provider about all medicines and if you are stressed or recently exercised, as these can affect results.
Results and what they mean
Results are reported as a number with a reference range, which varies by lab and by whether you are pregnant or breastfeeding. A clinician interprets the result along with your symptoms and other tests. This is general information, not medical advice; discuss your results with a qualified healthcare professional.
How to order this test
- Choose the test and place a confidential order online.
- Select a certified collection site and pick a time that suits you.
- Have your specimen collected — most draws take only a few minutes.
- Review results in a secure portal, typically within 1–3 days.
Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.
Availability by state
Direct-access online ordering for the prolactin levels blood test is available in most states. It is currently unavailable in 6 states:
Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →
Frequently asked questions
Do I need to fast for a prolactin test?
No, fasting is not typically required. However, follow any specific instructions from your healthcare provider.
What can cause high prolactin?
Common causes include certain medications, stress, exercise, an underactive thyroid, and benign pituitary growths. Your clinician will evaluate the cause.
Can I take my medications before the test?
Ask your healthcare provider. Some medicines can affect prolactin levels, so they may advise adjusting timing or note it for interpretation.
How long does it take to get results?
Results are usually available within 1 to 3 business days, though this can vary by laboratory.