Question 1

Can stress or exercise affect my prolactin test results?

Accepted Answer

Yes, small increases in prolactin may be caused by stress, exercise, and even having sex. Physical or emotional stress can temporarily elevate prolactin levels, which is why healthcare providers may recommend repeating the test if initial results are only mildly elevated. For the most accurate results, try to schedule your test when you're feeling relatively calm and avoid intense exercise immediately before blood collection.

Question 2

What medications can interfere with prolactin levels?

Accepted Answer

Antipsychotic drugs may elevate serum prolactin by blocking dopamine, thereby elevating prolactin levels, with many patients receiving neuroleptics developing amenorrhea, galactorrhea, and/or decreased libido. Other medications that can raise prolactin include certain antidepressants, blood pressure medications, anti-nausea drugs, and some pain medications. Always inform your healthcare provider about all medications, supplements, and herbs you're taking before testing.

Question 3

How does prolactin affect fertility in both men and women?

Accepted Answer

High levels of prolactin slow the release of gonadotropin-releasing hormone (GnRH) from the brain, which lowers the release of follicle-stimulating hormone (FSH), which is needed for eggs to grow and for ovulation to occur, and as a result, ovulation may not happen. In men, high prolactin levels can cause erectile dysfunction, reduced sexual desire, and infertility, with untreated hyperprolactinemia potentially causing a man to produce less sperm or no sperm at all.

Question 4

What symptoms might indicate I need a prolactin test?

Accepted Answer

Women may need testing if they experience irregular or absent periods, unexplained breast discharge, difficulty conceiving, or bone loss. Men who have decreased sex drive, difficulty getting an erection, or breast tenderness or enlargement may need a prolactin test. Additional symptoms that warrant testing include persistent headaches with vision changes, which could indicate a pituitary tumor pressing on nearby brain structures.

Question 5

What happens if my prolactin level is extremely high?

Accepted Answer

If levels are very high: up to 1,000 times the upper limit of what's considered normal: this could be a sign of prolactinoma, a tumor in the pituitary gland that is not cancer and is usually treated with medicine. Very high prolactin levels typically require additional imaging studies like MRI to evaluate the pituitary gland. Most prolactinomas respond well to medication that mimics dopamine, which can shrink the tumor and normalize prolactin levels.

Question 6

Can prolactin levels vary throughout the menstrual cycle?

Accepted Answer

Prolactin levels fluctuate throughout your cycle with changes that are moderate but measurable, with peak levels happening mid-cycle around ovulation, though these variations are normal and don't require treatment. While these natural fluctuations occur, they typically don't significantly affect the interpretation of test results for diagnostic purposes.