What is the normal prolactin level?

Normal prolactin: less than 20 ng/mL in men; less than 25 ng/mL in non-pregnant women; 80–400 ng/mL in pregnant women; 2–20 ng/mL postmenopausal women. Reference ranges vary by laboratory — always check the range on your specific report. In mU/L: multiply ng/mL by approximately 21.2.

What are symptoms of high prolactin?

In women: irregular or absent periods, infertility, galactorrhoea (unexpected milk production), reduced libido, vaginal dryness. In men: low libido, erectile dysfunction, infertility, sometimes gynaecomastia. In both: headaches and visual disturbances if caused by a pituitary tumour pressing on surrounding structures.

What causes elevated prolactin?

Common causes: pregnancy and breastfeeding (physiological); medications (antipsychotics, metoclopramide, antidepressants, opioids); prolactinoma (benign pituitary tumour); hypothyroidism; PCOS; renal failure; chest wall stimulation. Approximately 20% of elevated results are due to macroprolactinemia — a benign condition causing high measured levels without clinical symptoms.

What is macroprolactinemia?

Macroprolactinemia is a common cause of elevated total prolactin in which prolactin is bound to IgG antibodies forming large, biologically inactive complexes. It is present in approximately 20% of samples with elevated prolactin. People with macroprolactinemia typically have no symptoms despite high measured levels. It is detected by polyethylene glycol (PEG) precipitation testing and does not require treatment.

Why is my prolactin high if I'm not pregnant?

Several non-pregnancy causes of elevated prolactin include: medications (especially antipsychotics, metoclopramide, antidepressants), hypothyroidism, a prolactinoma (benign pituitary tumour), PCOS, renal failure, physiological stress at the time of the blood draw, or macroprolactinemia (biologically inactive form). Persistent elevation warrants investigation starting with a repeat fasting sample, TSH, and medication review.

What is the difference between ng/mL and mU/L for prolactin?

Both are units for measuring prolactin concentration. To convert: multiply ng/mL by 21.2 to get mU/L (or mIU/L — the same unit). So 20 ng/mL ≈ 424 mU/L. Reference ranges differ between labs and unit systems — always use the range on your specific report.

Prolactin: What High, Low & Normal Levels Mean (ng/mL and mU/L)

Serum

Other names: Prolactin, Prolactin Serum, Prolactin Blood Test, PRL, PRL Serum, Prolactin Level, Prolactin Test, Prolactin High, Prolactin Low, High Prolactin, Low Prolactin, Prolactin Normal Range, Prolactin ng/mL, Prolactin mU/L, Prolactin mIU/L, Hyperprolactinemia, Prolactin Levels, Prolactin Hormone, Lactotropin, Luteotropic Hormone, Prolactin Pituitary, Prolactin Elevated, Elevated Prolactin, Prolactin Too High, Prolactin Results, Prolactin Blood Level, Serum Prolactin, Prolaktın (Turkish), Prolactine (French/Dutch), Prolaktyna (Polish), Пролактин (Russian), Prolactina (Spanish/Portuguese/Italian)

Optimal Result: 102 - 496 mU/L, or 4.79 - 23.31 ng/mL.

Gonadotropins

From Healthmatters.io Team and reviewed by HM Editorial Team

Written on May 26, 2026 | Last updated Updated on May 26, 2026

Lab Results Explained and Tracked

QUICK ANSWER

Prolactin (PRL) is a hormone produced by the pituitary gland. It is best known for stimulating milk production (lactation) after childbirth, but it also plays roles in reproductive health, immune function, and metabolism in both men and women.

Normal range (non-pregnant adults):

Men: < 20 ng/mL (< 424 mU/L)
Women (non-pregnant): < 25 ng/mL (< 530 mU/L)
Women (pregnant): 80–400 ng/mL

High prolactin (hyperprolactinemia) is the most clinically significant finding. In most cases it has a treatable cause — most commonly a benign pituitary tumour (prolactinoma), a medication side effect, or hypothyroidism.

Key takeaway: A mildly elevated prolactin result is common and often explainable by benign causes including stress, recent eating, exercise, or medication. Levels above 100 ng/mL begin to raise concern for a prolactinoma. Levels above 500 ng/mL strongly suggest a large prolactinoma (macroprolactinoma). Most causes of hyperprolactinemia are treatable.

PROLACTIN NORMAL RANGE BY GROUP

Group	Normal range (ng/mL)	Normal range (mU/L)
Adult male	2.0–18.0	42–382
Adult female (non-pregnant)	3.0–30.0	64–638
Adult female (pregnant)	10.0–209.0	212–4,440
Adult female (postmenopausal)	2.0–20.0	42–424

Unit conversion: 1 ng/mL ≈ 21.2 mU/L (some labs use mIU/L — the same unit by a different abbreviation). If your result is in mU/L or mIU/L, divide by 21.2 to convert to ng/mL.

Reference ranges vary between laboratories. Always use the reference range printed on your specific lab report.

WHAT DOES HIGH PROLACTIN MEAN?

High prolactin (hyperprolactinemia) means prolactin levels are above the normal range for your sex and reproductive status. The clinical significance depends heavily on how high the level is and whether symptoms are present.

Interpreting the level:

Prolactin level	Interpretation
25–50 ng/mL (women) / 20–50 ng/mL (men)	Mildly elevated — often physiological or medication-related; repeat testing recommended
50–100 ng/mL	Moderate elevation — warrants investigation; medications and hypothyroidism are common causes
100–500 ng/mL	Significant elevation — prolactinoma likely; pituitary MRI recommended
> 500 ng/mL	Strongly suggests macroprolactinoma; urgent endocrinology referral

The most common causes of high prolactin:

1. Physiological (normal, temporary):

Pregnancy and breastfeeding — prolactin rises throughout pregnancy, peaking at delivery (80–400 ng/mL)
Nipple stimulation
Physical or emotional stress
Recent exercise
Recent sexual activity
Blood draw stress (ensure fasting and resting sample for accurate results)

2. Medications (most common non-physiological cause):

Antipsychotics — particularly risperidone, haloperidol, and typical antipsychotics (can raise prolactin >200 ng/mL in some cases)
Metoclopramide (Reglan) and domperidone — dopamine antagonists that strongly elevate prolactin
Antidepressants — SSRIs, tricyclics
Antihypertensives — methyldopa, verapamil
Opioid analgesics
Estrogen-containing contraceptives (mild elevation)
H2 blockers (cimetidine, ranitidine)

Drug-induced hyperprolactinemia rarely exceeds 118 ng/mL except with risperidone or metoclopramide, which can cause levels >200 ng/mL without a tumour.

3. Prolactinoma (pituitary tumour): The most common cause of persistent significant hyperprolactinemia. Prolactinomas are benign (non-cancerous) tumours of prolactin-secreting pituitary cells.

Microprolactinoma (< 10mm): most common; typically causes prolactin 25–250 ng/mL
Macroprolactinoma (≥ 10mm): less common; typically causes prolactin > 250 ng/mL, often > 500 ng/mL

4. Hypothyroidism: An underactive thyroid increases TRH (thyrotropin-releasing hormone), which also stimulates prolactin release. Mild-to-moderate prolactin elevation with hypothyroidism typically resolves with thyroid treatment. Always check TSH when prolactin is elevated.

5. Other causes:

Polycystic ovary syndrome (PCOS) — mild elevation common
Renal failure — impaired clearance of prolactin
Liver cirrhosis
Chest wall injury or stimulation (shingles on the chest, surgery, trauma)
Non-functioning pituitary adenomas compressing the pituitary stalk ("stalk effect")
Hypothalamic disorders

MACROPROLACTINEMIA: THE IMPORTANT EXCEPTION

Macroprolactinemia is a condition present in approximately 20% of blood samples showing elevated prolactin. It is frequently overlooked and often leads to unnecessary investigation.

What is it? Macroprolactin is a form of prolactin bound to IgG antibodies, forming large complexes with low biological activity. The standard prolactin assay measures total prolactin — including macroprolactin — so total levels appear elevated even though the active fraction is normal.

Why it matters: People with macroprolactinemia typically have:

Elevated total prolactin on a standard blood test
No symptoms of hyperprolactinemia (normal periods, no galactorrhoea, normal fertility)
Normal or near-normal bioactive (monomeric) prolactin when measured separately

How to detect it: Polyethylene glycol (PEG) precipitation testing identifies macroprolactin. If > 60% of prolactin is precipitated, macroprolactinemia is confirmed. This test is especially important before ordering a pituitary MRI in asymptomatic patients with mildly elevated prolactin.

If your prolactin is elevated but you have no symptoms, ask your clinician about macroprolactin testing before further investigation.

SYMPTOMS OF HIGH PROLACTIN (HYPERPROLACTINEMIA)

In women:

Irregular or absent periods (oligomenorrhoea/amenorrhoea)
Infertility or difficulty conceiving
Galactorrhoea (unexpected milk production from the nipples, unrelated to pregnancy)
Reduced libido
Vaginal dryness and dyspareunia (painful intercourse)
Bone loss (osteoporosis) with long-standing hyperprolactinemia

In men:

Reduced libido and erectile dysfunction
Infertility (reduced sperm production)
Galactorrhoea (less common than in women)
Gynaecomastia (breast tissue enlargement)
Bone loss with long-standing elevation

In both:

Headaches (if caused by a pituitary tumour pressing on surrounding structures)
Visual disturbances, particularly peripheral vision loss (if a macroadenoma compresses the optic chiasm)

WHAT DOES LOW PROLACTIN MEAN?

Low prolactin (hypoprolactinemia) is uncommon and usually indicates partial pituitary insufficiency (hypopituitarism). Unlike elevated prolactin, low prolactin rarely causes significant symptoms in non-pregnant adults.

Causes of low prolactin:

Pituitary gland damage or destruction — from trauma, surgery, radiation, or Sheehan syndrome (postpartum pituitary infarction)
Dopamine agonist medications used to treat hyperprolactinemia (cabergoline, bromocriptine) — intentional reduction
Hypopituitarism from any cause

Clinical significance:

In non-pregnant adults: usually no specific symptoms requiring treatment
In pregnant women and new mothers: low prolactin impairs milk production and may be the only sign of Sheehan syndrome
One study found prolactin < 5 ng/mL in women of reproductive age was associated with increased metabolic syndrome risk — though low prolactin itself is unlikely to be the primary concern

WHEN TO SEEK FOLLOW-UP

Consider discussing your result with a clinician if:

Prolactin is persistently elevated above the normal range on repeat testing (a single elevated result during stress is common)
Prolactin is above 100 ng/mL — pituitary MRI is typically recommended at this threshold
You have symptoms of hyperprolactinemia: irregular periods, galactorrhoea, infertility, sexual dysfunction, or unexplained headaches/visual changes
You are taking a medication known to raise prolactin and want to know if it is the cause
Prolactin is elevated and TSH has not been checked

Note on timing of the blood draw: Prolactin levels fluctuate throughout the day and are affected by stress, eating, exercise, and sleep. For the most reliable result, the sample should ideally be taken in the morning, fasting, and after 20–30 minutes of rest without significant activity or stress.

PROLACTIN IN MEN: SPECIFIC CONTEXT

Prolactin is frequently underappreciated in male reproductive health. In men, elevated prolactin suppresses testosterone by inhibiting GnRH pulsatility at the hypothalamic level, causing:

Low testosterone symptoms (fatigue, reduced libido, erectile dysfunction) — even with a "normal" testosterone level
Reduced LH and FSH (secondary hypogonadism pattern)
Infertility

In men, prolactin > 20 ng/mL warrants investigation regardless of symptoms. A pituitary MRI is recommended when prolactin exceeds 100 ng/mL in men.

PROLACTIN IN CONTEXT: INTERPRETIVE MATRIX WITH CORRELATED MARKERS

Prolactin should never be interpreted in isolation. The pattern of prolactin alongside LH, FSH, testosterone (in men), and estradiol reveals the underlying mechanism and guides next steps.

Pattern	Prolactin	LH	FSH	Testosterone (men) / Estradiol (women)	TSH	Most likely interpretation
Isolated hyperprolactinemia	↑↑	↓ or normal	↓ or normal	↓ (men) / ↓ or normal (women)	Normal	Prolactinoma or medication effect; prolactin suppresses GnRH → low LH/FSH → low sex hormones
Hyperprolactinemia + hypothyroidism	↑	Normal or ↓	Normal or ↓	Variable	↑↑	TRH excess from hypothyroidism stimulates both TSH and prolactin; treat thyroid first
High prolactin, no symptoms, normal sex hormones	↑ (mild)	Normal	Normal	Normal	Normal	Consider macroprolactinemia; request PEG precipitation test before further workup
High prolactin + low testosterone + normal LH/FSH	↑↑	Normal or ↓	Normal or ↓	↓	Normal	Prolactinoma suppressing gonadotropin axis; secondary hypogonadism pattern
Low prolactin + low LH + low FSH + low testosterone	↓	↓	↓	↓ (men)	↓ or normal	Hypopituitarism (pan-hypopituitary pattern); pituitary damage or Sheehan syndrome
Normal prolactin + high LH + high FSH + low testosterone	Normal	↑↑	↑↑	↓	Normal	Primary hypogonadism (testicular failure); prolactin is not the cause
Pregnancy / breastfeeding	↑↑↑ (up to 400 ng/mL)	↓	↓	↓	Normal	Physiological; expected pattern during lactation
High prolactin + high LH + high FSH	↑	↑	↑	Variable	Normal	Less common; consider pituitary stalk lesion, co-secreting adenoma, or non-functioning tumour with stalk effect

Key clinical principles from this table:

Prolactin suppresses GnRH pulsatility — elevated prolactin almost always causes downstream suppression of LH and FSH, which then reduces testosterone (in men) and estradiol/progesterone (in women). This is why men with high prolactin often have low testosterone even when the testosterone test itself looks "borderline."
Always check TSH with elevated prolactin. Hypothyroidism is a reversible cause that is easily missed and easily treated. Treating the thyroid often normalises prolactin without any prolactin-specific intervention.
Macroprolactinemia produces an atypical pattern — prolactin elevated but LH, FSH, and sex hormones normal. This is the most important pattern to recognise because it does not require MRI or treatment.
The ratio between prolactin and LH/FSH tells you the direction of the problem. If prolactin is high and LH/FSH are low, prolactin is suppressing the axis (start with prolactin). If prolactin is normal and LH/FSH are high with low sex hormones, the problem is in the gonads, not the pituitary.

INTERNAL LINKS

Related tests on HealthMatters: TSH (Thyroid Stimulating Hormone) · LH (Luteinizing Hormone) · FSH (Follicle Stimulating Hormone) · Estradiol · Testosterone · IGF-1 · Progesterone · AMH

If your lab report says "PROLACTIN, SERUM" see also: Prolactin (Endocrinology)

FAQ about Prolactin

What is the normal prolactin level?

Normal prolactin: less than 20 ng/mL in men; less than 25 ng/mL in non-pregnant women; 80–400 ng/mL in pregnant women; 2–20 ng/mL postmenopausal women. Reference ranges vary by laboratory — always check the range on your specific report. In mU/L: multiply ng/mL by approximately 21.2.
What does high prolactin mean?

High prolactin (hyperprolactinemia) means prolactin levels are above the normal range. Mild elevations are often caused by stress, recent eating, exercise, medications, or hypothyroidism. Significant elevations (> 100 ng/mL) are more likely to indicate a prolactinoma — a benign pituitary tumour. Most causes are treatable.
What are symptoms of high prolactin?

In women: irregular or absent periods, infertility, galactorrhoea (unexpected milk production), reduced libido, vaginal dryness. In men: low libido, erectile dysfunction, infertility, sometimes gynaecomastia. In both: headaches and visual disturbances if caused by a pituitary tumour pressing on surrounding structures.
What causes elevated prolactin?

Common causes: pregnancy and breastfeeding (physiological); medications (antipsychotics, metoclopramide, antidepressants, opioids); prolactinoma (benign pituitary tumour); hypothyroidism; PCOS; renal failure; chest wall stimulation. Approximately 20% of elevated results are due to macroprolactinemia — a benign condition causing high measured levels without clinical symptoms.
What is a prolactinoma?

A prolactinoma is a benign (non-cancerous) tumour of the prolactin-secreting cells in the pituitary gland. It is the most common pituitary tumour and the most common cause of persistent significant hyperprolactinemia. Microprolactinomas (< 10mm) are more common and typically cause prolactin 25–250 ng/mL. Macroprolactinomas (≥ 10mm) cause higher levels, often > 500 ng/mL. Most prolactinomas respond well to dopamine agonist treatment (cabergoline or bromocriptine) and rarely require surgery.
What is macroprolactinemia?

Macroprolactinemia is a common cause of elevated total prolactin in which prolactin is bound to IgG antibodies forming large, biologically inactive complexes. It is present in approximately 20% of samples with elevated prolactin. People with macroprolactinemia typically have no symptoms despite high measured levels. It is detected by polyethylene glycol (PEG) precipitation testing and does not require treatment.
What does low prolactin mean?

Low prolactin (hypoprolactinemia) is uncommon and usually reflects pituitary insufficiency (hypopituitarism). In non-pregnant adults it typically requires no specific treatment. In new mothers, low prolactin impairs milk production and may indicate Sheehan syndrome (pituitary damage from postpartum haemorrhage).
Why is my prolactin high if I'm not pregnant?

Several non-pregnancy causes of elevated prolactin include: medications (especially antipsychotics, metoclopramide, antidepressants), hypothyroidism, a prolactinoma (benign pituitary tumour), PCOS, renal failure, physiological stress at the time of the blood draw, or macroprolactinemia (biologically inactive form). Persistent elevation warrants investigation starting with a repeat fasting sample, TSH, and medication review.
What is the difference between ng/mL and mU/L for prolactin?

Both are units for measuring prolactin concentration. To convert: multiply ng/mL by 21.2 to get mU/L (or mIU/L — the same unit). So 20 ng/mL ≈ 424 mU/L. Reference ranges differ between labs and unit systems — always use the range on your specific report.

Lab Results Explained and Tracked

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What does it mean if your Prolactin result is too high?

High prolactin (hyperprolactinemia) is the most common clinically significant prolactin finding. The level matters: mild elevations (25–50 ng/mL) are often caused by physiological factors, stress, or medications and may not require treatment. Moderate elevations (50–100 ng/mL) warrant investigation of medication causes and thyroid function. Significant elevations (> 100 ng/mL) typically prompt pituitary MRI to evaluate for prolactinoma.

Approximately 20% of elevated prolactin results are due to macroprolactinemia — a benign condition where prolactin is bound to antibodies, causing high measured levels without symptoms or clinical consequences. If prolactin is elevated but you have no symptoms (normal periods, no galactorrhoea, no fertility issues), ask your clinician about macroprolactin testing before further workup.

The most common treatable causes are prolactinoma (benign pituitary tumour), medications (especially antipsychotics and metoclopramide), and hypothyroidism. Most cases respond well to treatment — either dopamine agonist therapy (cabergoline, bromocriptine) for prolactinoma, medication adjustment, or thyroid hormone replacement.

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What does it mean if your Prolactin result is too low?

Low prolactin is uncommon and in most non-pregnant adults does not cause specific symptoms requiring treatment. The most significant clinical context is in women who have recently given birth — low prolactin impairs milk production and may indicate Sheehan syndrome (pituitary damage from postpartum haemorrhage). In men and non-pregnant women, low prolactin usually reflects partial pituitary insufficiency and is evaluated alongside other pituitary hormones rather than in isolation.

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Prolactin: What High, Low & Normal Levels Mean (ng/mL and mU/L)

QUICK ANSWER

PROLACTIN NORMAL RANGE BY GROUP

WHAT DOES HIGH PROLACTIN MEAN?

MACROPROLACTINEMIA: THE IMPORTANT EXCEPTION

SYMPTOMS OF HIGH PROLACTIN (HYPERPROLACTINEMIA)

WHAT DOES LOW PROLACTIN MEAN?

WHEN TO SEEK FOLLOW-UP

PROLACTIN IN MEN: SPECIFIC CONTEXT

PROLACTIN IN CONTEXT: INTERPRETIVE MATRIX WITH CORRELATED MARKERS

INTERNAL LINKS

FAQ about Prolactin

What is the normal prolactin level?

What does high prolactin mean?

What are symptoms of high prolactin?

What causes elevated prolactin?

What is a prolactinoma?

What is macroprolactinemia?

What does low prolactin mean?

Why is my prolactin high if I'm not pregnant?

What is the difference between ng/mL and mU/L for prolactin?

All Your Lab Results. One Simple Dashboard.

What does it mean if your Prolactin result is too high?

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Import, Track, and Share Your Lab Results

What does it mean if your Prolactin result is too low?

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