What Prolactin tells you
Hormones are chemical messengers involved in energy, mood, body composition, and reproductive health. This group covers the key hormones a clinician may review when looking at these areas.
Which Honed panels include Prolactin
Prolactin is measured in the Hormone Panel. Every sample is collected at a pathology collection centre and processed at a NATA-accredited laboratory against RCPA reference ranges, with personalised plain-English commentary in your secure online report.
Why Prolactin matters
Prolactin is a pituitary hormone with primary roles in breast tissue development and milk production in women. In both men and women, prolactin has additional effects on the immune system, mood, and sexual function. Elevated prolactin can suppress gonadotropin-releasing hormone (GnRH) and reduce sex hormone production in both sexes, making it relevant to reproductive health. Prolactin is released in response to several stimuli, including stress, sleep, and nipple stimulation.
The range explained
Low levels
Low prolactin (below 5 mIU/L in men and non-lactating women) is rare and may indicate pituitary dysfunction. Clinically, low prolactin is not typically concerning.
Normal range
Reference ranges: men 3–13 mIU/L, non-lactating women 3–29 mIU/L. Lactating women have significantly higher levels. These represent physiological baseline levels.
High levels
Elevated prolactin (above 13 mIU/L in men, above 29 mIU/L in non-lactating women) may indicate a prolactin-secreting pituitary adenoma, hypothyroidism, or medication effects. High prolactin can suppress testosterone and ovulation.
What affects Prolactin
- Training: Intense or prolonged exercise can transiently elevate prolactin. Recovery supports normalization.
- Nutrition: Adequate energy and protein support hormonal balance including prolactin. Underfueling can elevate prolactin.
- Sleep: Prolactin is released during sleep. Poor sleep may dysregulate prolactin secretion.
- Stress: Psychological stress elevates prolactin through TRH (thyrotropin-releasing hormone). Stress management supports normal prolactin.
When to retest
Every 12 months for general health; more frequently if elevated.
Why athletes care
Athletes monitor prolactin because elevated prolactin can suppress testosterone and LH, impairing recovery and performance. Prolactin elevation often accompanies overtraining and insufficient sleep.
Related hormones markers
FAQ
What does the Prolactin blood test measure?
A pituitary hormone sometimes reviewed when assessing hormonal balance. Results are interpreted in context by a clinician.
Which Honed Health panels include Prolactin?
Prolactin is included in the Hormone panel.
What unit is Prolactin measured in?
Prolactin is reported in mIU/L, measured at NATA-accredited laboratories against RCPA reference ranges, with personalised plain-English commentary in your secure report.