Prolactin Level Test

The prolactin level test is a blood test that measures the amount of prolactin, a hormone produced by the pituitary gland at the base of the brain. Doctors order this test to find out why someone is producing breast milk unexpectedly (galactorrhea), having irregular or absent periods, struggling with infertility, experiencing low libido, or showing symptoms of a pituitary problem like vision changes or headaches. It is a routine, low-risk test that provides important clues about your reproductive and endocrine health. Results must always be interpreted by a qualified clinician, as levels can be temporarily affected by stress, sleep, meals, or medications.

What Is Prolactin and Why Does Its Level Matter?

Prolactin is best known for stimulating breast milk production after childbirth, but it also plays a role in regulating the menstrual cycle, ovulation, and sperm production. In men, prolactin helps control testosterone levels and libido. When prolactin levels are too high (hyperprolactinemia), it can suppress the hormones that control ovulation and sperm production, leading to infertility, irregular periods, and low sex drive. Mild elevations are common and can be caused by stress, sleep disruption, or recent high-protein meals. Significant or persistent elevations may point to an underlying condition that needs medical attention.

Reasons Your Doctor Might Order This Test

Your doctor may recommend a prolactin level test if you have any of the following signs or concerns:

• Galactorrhea: Milky discharge from the breasts that is not related to breastfeeding.
• Irregular or absent periods (amenorrhea) — a common concern in women with PCOS or pituitary issues.
• Infertility in both men and women, especially when ovulation or sperm production is affected.
• Low libido or erectile dysfunction in men.
• Pituitary mass symptoms: Headaches, vision changes (especially loss of side vision), or unexplained weight gain.
• Suspected hypothyroidism or kidney disease — both conditions can cause prolactin to rise.
• Monitoring pituitary function after head injury, surgery, or radiation.

The test is often ordered as part of a fertility workup or alongside other hormone tests like FSH, LH, TSH, and estrogen.

How to Prepare for the Prolactin Blood Test

Proper preparation helps ensure accurate results. Follow these steps before your blood draw:

• Fast overnight (8–12 hours): Water is allowed, but avoid food, especially high-protein meals.
• Early morning draw: Prolactin levels naturally rise during sleep and peak around waking, so the blood sample is usually taken within 1–3 hours of waking.
• Avoid stress: Physical or emotional stress can temporarily raise prolactin. Rest for 15–30 minutes before the draw if possible.
• Tell your doctor about medications: Antipsychotics, antidepressants, high blood pressure medicines (e.g., verapamil), and opioids can elevate prolactin. Some medicines lower it. Do not stop any medication without consulting your doctor.
• Inform about recent exams: A breast exam, nipple stimulation, or recent sexual activity can falsely raise prolactin levels for a few hours.

The blood draw itself takes just a few minutes and carries minimal risk (slight bruising or dizziness).

What Do Prolactin Results Mean?

Reference ranges vary between laboratories, but typical normal values are:

Group	Typical Normal Range (ng/mL)
Non-pregnant women	Below 25
Pregnant women	Up to 200–300 (increases during pregnancy)
Men	Below 20
Children	Lower (ask your lab for pediatric reference)

Elevated prolactin (hyperprolactinemia) may be caused by:

• Stress, sleep deprivation, or recent exercise.
• Medications (antipsychotics, antidepressants, opioids).
• Hypothyroidism (pituitary overdrive to compensate).
• Kidney disease or liver cirrhosis.
• Prolactinoma (a small, typically benign pituitary tumor).
• Polycystic ovary syndrome (PCOS) — mild elevations are common.

Marked elevation (e.g., over 100–200 ng/mL) is more suspicious for a prolactinoma and usually warrants imaging (MRI of the pituitary).

Can Prolactin Levels Be Too Low?

Low prolactin levels are less commonly a clinical concern, but they can occur in certain situations:

• Pituitary failure (hypopituitarism): For example, after Sheehan syndrome (severe blood loss during childbirth) or pituitary surgery.
• Certain medications: Dopamine agonists (used for Parkinson’s or prolactinomas) can lower prolactin.
• Radiation therapy to the pituitary area.

Low prolactin itself rarely causes symptoms. The finding is most relevant when other pituitary hormones (like cortisol, thyroid hormones, and growth hormone) are also low. Your doctor will interpret low levels in the context of your overall health.

How Much Does the Prolactin Level Test Cost in Bangladesh?

Prices vary across labs and cities in Bangladesh. The following are typical ranges from private labs and hospitals — always confirm before your test.

Item	Approx. BDT Range	Notes
Prolactin (standalone test)	৳500 – ৳1,200	Price depends on lab type (local vs. national chain) and city. Dhaka and Chittagong may be higher.
Prolactin + basic hormone panel (FSH, LH, TSH)	৳1,500 – ৳3,000	Often ordered for infertility or irregular periods. Some labs offer package discounts.
Advanced hormone panel (adds estrogen, testosterone, cortisol)	৳2,000 – ৳4,000	Common in premium hospitals or when pituitary dysfunction is suspected.

Note: Costs change over time. Call the lab or hospital a day before your test for the current price and any fasting requirements.

Find Endocrinologists and Gynecologists by Division in Bangladesh

If your prolactin test shows abnormal levels, you may need to consult an endocrinologist or a gynecologist for further evaluation. Use the table below to find specialist surgeons in your division.

Division	Find a doctor
Dhaka / ঢাকা	General Surgeons in Dhaka
Chittagong / চট্টগ্রাম	General Surgeons in Chittagong
Khulna / খুলনা	General Surgeons in Khulna
Rajshahi / রাজশাহী	General Surgeons in Rajshahi
Rangpur / রংপুর	General Surgeons in Rangpur
Sylhet / সিলেট	General Surgeons in Sylhet
Barishal / বরিশাল	General Surgeons in Barishal
Mymensingh / ময়মনসিংহ	General Surgeons in Mymensingh

Frequently Asked Questions

What time of day should the prolactin blood test be done?

Prolactin levels naturally fluctuate throughout the day, peaking during deep sleep and falling after you wake up. For the most consistent result, your doctor will usually ask you to have the blood drawn about 2–3 hours after waking up, typically between 8:00 AM and 10:00 AM. Avoiding strenuous exercise, stress, and breast stimulation on the morning of the test also helps keep the reading reliable.

Can stress or a poor night’s sleep cause a falsely high prolactin level?

Yes, both physical and emotional stress can temporarily raise prolactin. Even a single night of disturbed sleep may increase the level because prolactin secretion is tied to sleep cycles. That is why doctors often repeat a borderline high result on a different day after you have had a calm, well-rested morning. A single high reading does not automatically mean a pituitary problem — your clinician will consider your stress level and sleep quality before interpreting the result.

Which common medications can increase prolactin levels?

Several prescription and over-the-counter medicines can raise prolactin. These include certain antipsychotics (e.g., risperidone, haloperidol), antidepressants (especially SSRIs like fluoxetine), metoclopramide (a gastric motility drug), verapamil (a blood pressure medication), and opioid pain relievers. Birth control pills and high-dose estrogen can also elevate prolactin in some women. Always tell your doctor about every medicine, supplement, or herbal product you are taking before the test.

How long does it take to get prolactin test results in Bangladesh?

In most private diagnostic labs and hospital-based labs in Bangladesh, results are available within 24 to 48 hours. Some high-volume labs in Dhaka, such as those in Dhanmondi or Gulshan, may report results on the same day if the blood sample is collected early (before 10 AM). For government hospital labs, turnaround time can be longer (2–3 days). Your reporting time depends on the lab’s workload and whether the sample must be sent to a central facility.

Do I need to fast before the prolactin test?

Fasting is not usually required for a prolactin level test; however, your doctor may recommend avoiding heavy meals for 2–3 hours before the blood draw because a large, protein-rich meal might slightly influence the result. Water is generally fine. In contrast, you should avoid drinking alcohol or caffeine for at least 24 hours before the test, as both can temporarily alter prolactin secretion. Always follow any specific instructions given by your physician or the lab.

Sources

The following sources are from international journals, government health agencies, or recognized medical organizations:

• Prolactin Test – Mayo Clinic (mayoclinic.org)
• Prolactin – MedlinePlus (NIH) (medlineplus.gov)
• Prolactinoma – National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) (niddk.nih.gov)
• World Health Organization — Prolactin Level Test (who.int)
• MedlinePlus — Prolactin Level Test (medlineplus.gov)
• CDC — Prolactin Level Test (cdc.gov)