High prolactin (hyperprolactinemia) can disrupt or stop ovulation, so it’s one of the routine tests before fertility treatment. A single high result isn’t a diagnosis. It should be confirmed, and common causes such as medications, thyroid problems or a small pituitary growth should be checked. Most causes are treatable with medication, and it’s best to get prolactin under control at home before you travel to Colombia for IVF.
- Prolactin can rise temporarily with stress, a difficult blood draw, recent breast stimulation or other factors. Mildly high results are often repeated.
- Macroprolactin, an inactive form of the hormone, can make levels look high without causing problems. Labs can test for it.
- Common causes include certain medications, an underactive thyroid and benign pituitary tumors (prolactinomas). An MRI may be ordered.
- Dopamine agonists such as cabergoline and bromocriptine are standard treatments and often restore ovulation.
What prolactin does and why it matters
Prolactin is a hormone made by the pituitary gland. Its main job is to stimulate milk production after childbirth. Outside pregnancy and breastfeeding, levels are normally low. When prolactin is high, it suppresses the brain’s release of GnRH, which lowers the FSH and LH that drive follicle growth and ovulation. That’s why breastfeeding often delays the return of periods, and why high prolactin can cause:
- Irregular or absent periods
- Infertility due to lack of ovulation
- Milky nipple discharge (galactorrhea) when not breastfeeding
- Low libido or vaginal dryness
- Headaches or vision changes, which can be a sign of a larger pituitary tumor and should be checked promptly
Some people with high prolactin have no symptoms at all, and it’s found only on routine testing. Prolactin is a standard part of a fertility workup. See understanding fertility tests.
Retesting: make sure the result is real
Prolactin is sensitive to many everyday factors, so a mildly elevated result is often repeated before further workup. Endocrine Society guidance says a single measurement can be enough to diagnose high prolactin if the blood was drawn without excessive stress. In practice, many doctors repeat mild elevations under better conditions. Ask your doctor how to prepare. Common advice includes:
- Schedule a morning draw. Many labs prefer morning samples. Some doctors ask you to fast or avoid a large meal beforehand.
- Avoid breast or nipple stimulation for a day or so before the test, including breast exams.
- Avoid strenuous exercise right before the draw.
- Rest before the draw if possible, especially if you find needles stressful.
- Bring a list of every medication and supplement you take, so the doctor can interpret the result.
Macroprolactin
In some people, much of the prolactin in the blood is bound into large complexes called macroprolactin. Macroprolactin shows up on standard tests but is generally considered biologically inactive. Someone with high macroprolactin may have a high reading without hormone-related symptoms. If your prolactin is high but your cycles are regular and you have no symptoms, ask whether the lab can screen for macroprolactin. Many labs do this with a technique called PEG precipitation.
Common causes
| Cause | How it’s checked | Typical approach |
|---|---|---|
| Medications | Review of all prescriptions. Common culprits include some antipsychotics, some antidepressants, some anti-nausea drugs such as metoclopramide, and some blood pressure drugs. | Your prescribing doctor may adjust or switch the medication. Never stop a psychiatric medication on your own. |
| Hypothyroidism | TSH and free T4 | Treating the thyroid often brings prolactin down. See thyroid and fertility. |
| Prolactinoma (benign pituitary tumor) | Pituitary MRI | Usually medication. Microadenomas are under 1 cm, macroadenomas are larger. |
| Other pituitary or brain conditions | MRI | Depends on the finding |
| Kidney or liver disease | Blood tests | Treat the underlying condition |
| Macroprolactin | Special lab test | Often no treatment needed |
| Physiological causes | History (pregnancy, breastfeeding, stress) | Rule out pregnancy and retest |
If no medication or thyroid cause explains the result, your doctor will usually order a pituitary MRI. Hearing “pituitary tumor” is alarming, but prolactinomas are benign and usually respond well to medication. Endocrine Society guidance recommends medication over surgery as the first-line treatment.
Treatment with dopamine agonists
Dopamine naturally keeps prolactin release in check. Dopamine agonists mimic it and lower prolactin. They can also shrink prolactinomas. The two most commonly used are:
- Cabergoline. Usually taken once or twice a week. The Endocrine Society prefers it because it tends to normalize prolactin more effectively and with fewer side effects.
- Bromocriptine. Taken daily. It has a long track record in pregnancy and is sometimes chosen for people actively trying to conceive.
Side effects can include nausea, dizziness and headache, especially at first. Your doctor will usually start low and adjust. Once prolactin normalizes, ovulation often returns, and some people conceive without IVF.
Note: If you have a prolactinoma and become pregnant, guidelines generally advise stopping the dopamine agonist once pregnancy is confirmed, with monitoring for symptoms, especially for larger tumors. Make sure your endocrinologist, your fertility clinic and your obstetric provider all know about the tumor. Prolactin is normally high in pregnancy, so blood tests are not used to monitor it then.
Don’t forget the male partner
Men can have high prolactin too. In men, it can lower testosterone and cause low libido, erectile dysfunction, reduced sperm production and sometimes breast enlargement. If a male partner has a low semen analysis or low testosterone, prolactin is often part of the workup. The causes and treatments are similar, and a prolactinoma in men may be larger when found, because symptoms are easier to overlook.
Normalize before you travel to Colombia
High prolactin is a condition to address before your IVF trip, not during it. The checklist below helps you arrive ready.
- Confirm high prolactin with a repeat test under the right conditions.
- Check TSH and review medications with your doctor.
- Get an MRI if your doctor recommends one, and keep the images and report.
- Start treatment at home and recheck levels as your doctor advises.
- Send the Colombian clinic your prolactin history, MRI report, current medication and doses. See transferring records internationally.
- Bring enough medication for the whole trip, in original packaging with a prescription.
- Agree on who adjusts your dose if needed: your home endocrinologist or the Colombian clinic.
Once prolactin is under control, it usually doesn’t change the length of an IVF trip. But a prolactin problem found at a first appointment in Colombia could delay your cycle while it’s confirmed and treated. Testing at home first avoids that. See our guide to fertility testing before your consultation.
Tip: Ask your home endocrinologist to write a short summary letter with your diagnosis, MRI findings, current dose and the target they’re aiming for. It’s the fastest way to bring a Colombian fertility team up to date. Our guide to coordinating your home and Colombian clinic has more ideas.
For treatment pricing, see the IVF cost in Colombia guide. Dose changes and treatment decisions should be made with your endocrinologist or reproductive endocrinologist.
Frequently asked questions
Can high prolactin cause infertility?
Yes. Elevated prolactin can suppress the hormones that trigger ovulation, leading to irregular or absent cycles. Treating the cause often restores ovulation.
Should I fast before a prolactin test?
Instructions vary by lab and doctor. Many recommend a morning draw, avoiding breast stimulation and strenuous exercise beforehand, and resting before the test. Ask your doctor for their specific instructions.
What is macroprolactin?
It’s a large, bound form of prolactin that shows up on standard tests but is generally considered inactive. It can cause high readings without symptoms. A lab can screen for it.
Can I do IVF while taking cabergoline?
Many patients do. Your fertility specialist and endocrinologist will decide when to continue, adjust or stop the medication around treatment and pregnancy.
Do I need an MRI for high prolactin?
Often, if the elevation is confirmed and isn’t explained by medications, thyroid disease or macroprolactin. Your doctor will decide based on your levels and symptoms.
Talk through your options, free
Tell us about your situation and we will help you understand clinics, costs and next steps in Colombia.
Request a free consultation →