Prolactin
Prolactin is a pituitary hormone primarily known for stimulating breast milk production. Elevated levels in non-pregnant individuals can cause menstrual irregularities, infertility, and may indicate a pituitary tumour.
12 hours
Turnaround
Blood
Sample
What the Prolactin test tells you
Prolactin is made by the front part of the pituitary gland and is best known for enabling milk production after childbirth. It is unusual among pituitary hormones in that the brain mainly holds it back rather than pushing it out: dopamine travelling down from the hypothalamus keeps prolactin suppressed most of the time. Anything that interrupts that dopamine brake — a medication that blocks dopamine, pressure on the pituitary stalk, or a growth in the pituitary that produces prolactin directly — allows the level to rise.
When prolactin is persistently raised outside pregnancy and breastfeeding, it interferes with the pulsed signal that drives the ovaries and testes. The consequences are recognisable: periods that become infrequent or stop, difficulty conceiving, reduced libido, erectile difficulty in men, and sometimes milk production in someone who is not breastfeeding. This is why prolactin is part of the standard set of tests when periods stop unexpectedly or when conception is proving difficult, even in people who have no symptoms pointing to the pituitary at all.
The practical difficulty with prolactin is that it responds to ordinary events. It rises with sleep, with a meal, with exercise, with breast or nipple stimulation, and with the stress of the needle itself, so a modestly raised result is common and often means nothing. For that reason a first raised result is usually repeated under calm, rested conditions before anything follows from it. Medication review comes next, since several widely used drugs raise prolactin as an expected effect, as does an underactive thyroid. Only when a raised level persists without one of these explanations does the pituitary itself become the focus, at which point imaging rather than more blood tests answers the question.
Ordered for menstrual irregularities, galactorrhea, infertility, erectile dysfunction, or when a pituitary tumour is suspected on imaging.
Raised prolactin suppresses the hormone signal to the ovaries, and is one of the treatable causes of periods becoming infrequent or stopping altogether.
Prolactin is part of the routine fertility hormone panel because a raised level can prevent ovulation while producing few other symptoms.
Milk from the breast in someone who is not breastfeeding is the classic reason to measure prolactin, in both women and men.
Persistent headaches, changes in vision or a pituitary abnormality seen on imaging prompt a prolactin measurement as part of the assessment.
Reasons your doctor may request the Prolactin test
Your doctor may order this test for any of the reasons below. Some are routine checks, others follow specific symptoms or an earlier result.
Periods, milk production & libido
Periods that have become infrequent or have stopped without an obvious explanation.
Milk production from the breast outside pregnancy and breastfeeding.
Reduced libido, erectile difficulty or low testosterone in a man.
Fertility assessment
Difficulty conceiving, as part of a baseline hormone assessment.
Pituitary assessment & follow-up
Headaches or visual changes where a pituitary lesion is being considered.
Monitoring a known pituitary adenoma or its treatment.
No fasting window — pick any slot that suits you, online or on WhatsApp.
A DHA-licensed nurse collects your sample at home or in the office — free home collection.
A physician-reviewed, easy-to-read report lands securely by WhatsApp and email.
Prolactin influences reproduction and lactation.
Ranges are a guide — your physician interprets your result alongside your symptoms and history.
What a higher result can point to
- Pregnancy and breastfeeding, in which a high prolactin is entirely expected and physiological.
- Medications that block dopamine, including several antipsychotics, some antidepressants, and anti-sickness drugs such as metoclopramide and domperidone.
- A prolactin-producing pituitary adenoma, which is the commonest hormone-secreting pituitary tumour.
- An underactive thyroid, which raises prolactin indirectly and resolves once the thyroid is treated.
- Stress at the time of the blood draw, recent sleep, exercise, a meal, or nipple and chest wall stimulation.
- Chronic kidney disease or advanced liver disease, which slow the clearance of prolactin from the blood.
What a lower result can point to
- Treatment with a dopamine agonist, the medication used specifically to bring prolactin down.
- Extensive pituitary damage from a large tumour, surgery, radiotherapy or head injury, usually alongside other low pituitary hormones.
- Pituitary injury following severe blood loss around childbirth, which can affect prolactin among other hormones.
These are possibilities, not diagnoses. A single value outside the reference range is interpreted alongside your symptoms, history and other tests — your doctor decides what it means for you.
What this test cannot tell you
- Prolactin rises with the stress of venepuncture, with recent sleep, exercise, a meal and breast stimulation, so a mildly raised result is often repeated under rested conditions before it carries any weight.
- An inactive bound form of prolactin can give a raised reading in someone with no symptoms at all; laboratories check for this before an unexpected result is acted upon.
- Very high concentrations can occasionally read misleadingly low unless the sample is retested after dilution, which the laboratory arranges when the clinical picture does not fit.
- A raised prolactin identifies a problem but not its cause; separating medication, thyroid disease and a pituitary lesion needs a medication review, thyroid tests and usually imaging.
Risks of the blood draw
- Mild bruising or brief soreness where the needle went in.
- Occasional lightheadedness, which settles after a few minutes of rest.
- Bleeding or infection at the site, which is rare with sterile single-use equipment.
- 1Prolactin is held down by dopamine from the brain, so anything blocking that brake raises it.
- 2A mildly raised result is common and frequently reflects the circumstances of the blood draw rather than a disorder.
- 3A first raised result is normally repeated under rested conditions before any conclusion is drawn.
- 4Medications and an underactive thyroid are checked before the pituitary is investigated.
- 5A low prolactin is rarely investigated on its own and usually matters only alongside other low pituitary hormones.
Frequently Asked Questions
Everything you need to know about the Prolactin test. Can't find what you're looking for?
Talk to our team→Yes, and this is one of the most common reasons for a mildly raised result. Anxiety about the needle, rushing to the appointment, exercise, a recent meal or breast stimulation can all lift the level temporarily. This is exactly why a raised result is usually repeated in calmer conditions before it is taken to mean anything.
Drugs that block dopamine are the main group — a number of antipsychotics, some antidepressants, and anti-sickness medicines such as metoclopramide and domperidone. Others contribute less predictably. Never stop a prescribed medication to get a better result; bring the list to your doctor and let them judge.
Prolactin dampens the pulsed signal from the hypothalamus that drives FSH and LH. Without that rhythm the ovaries do not receive the instruction to mature and release an egg, so cycles become infrequent or stop. Bringing prolactin back down usually allows cycles to return.
It is. Prolactin can circulate bound into a larger inactive complex that the assay detects but the body does not respond to, so the reading is high while nothing is actually wrong. Laboratories can check for this, which is why an unexpected result is investigated rather than treated immediately.
Prolactin is a pituitary hormone primarily known for stimulating breast milk production. Elevated levels in non-pregnant individuals can cause menstrual irregularities, infertility, and may indicate a pituitary tumour.
Ordered for menstrual irregularities, galactorrhea, infertility, erectile dysfunction, or when a pituitary tumour is suspected on imaging.
No, fasting is not required for the Milk & Fertility Hormone test, so you can eat and drink normally beforehand.
The Milk & Fertility Hormone test uses a blood sample, collected quickly by our DHA-licensed phlebotomist with minimal discomfort.
Results for the Milk & Fertility Hormone test are typically ready within 12 hours. You will receive a secure digital report, and your Smart Report highlights anything outside the normal range.
The Milk & Fertility Hormone test is AED 219, which includes free home sample collection and a physician-reviewed report. You can also build a custom panel and pay only for the markers you choose.
Yes. A DHA-licensed phlebotomist can collect your sample at home or the office anywhere in Dubai at no extra cost, 7 days a week. See how it works.
It is commonly chosen by adults planning a family. If you are not sure it is right for you, our care team is happy to advise.
Add the Milk & Fertility Hormone test to your cart and complete the short booking wizard, choosing home collection or a lab visit. Guest checkout lets you book without creating an account.
Yes. It is processed at our EIAC-accredited laboratory (ISO 15189:2022) under DHA license 0046381 and verified by board-certified pathologists.
Every report includes reference ranges and plain-language notes. If you have questions, our care team can arrange a clinician review — just get in touch.
Absolutely. Add it to a curated health package or bundle it with any of our 160+ biomarkers, often from a single sample in one visit.