Prolactin is a hormone released by the pituitary gland. The prolactin test measures the amount of prolactin in the blood.

Prolactin is usually measured when checking for pituitary tumors and the cause of:

Breast milk production that is not related to childbirth (galactorrhea)

Decreased sex drive (libido) in men and women, Impotence, Infertility, Irregular or no menstrual periods (amenorrhea.)



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  • Fasting Required: NO
  • Preferred Specimen: Serum
  • Reference Range(s):
    Adult Male 2.0-18.0 ng/mL
    Adult Female  
    Non-Pregnant 3.0-30.0 ng/mL
    Pregnant 10.0-209.0 ng/mL
    Postmenopausal 2.0-20.0 ng/mL
    Stages of Puberty (Tanner Stages)  
      Female Observed Male Observed
    Stage I ng/mL ≤10.0 ng/mL
    Stage II-III 2.6-18.0 ng/mL ≤6.1 ng/mL
    Stage IV-V 3.2-20.0 ng/mL 2.8-11.0 ng/mL
  • Turnaround Time: 3 Days
  • Test Code: 746