Prolactin CPT: 84146

Expected Turnaround Time

Within 1 day

Specimen Requirements




0.8 mL

Minimum Volume

0.3 mL (Note: This volume does not allow for repeat testing.)


Gel-barrier tube, transport tube, or green-top (heparin) tube; do notuse EDTA or oxalate anticoagulants.


If a red-top tube is used, transfer separated serum to a plastic transport tube.

Storage Instructions


Stability Requirements

Temperature Period
Room Temperature Not recommended
Refrigerated 5 days
Frozen 4 weeks
Freeze/thaw/ cycles Stable x 3

Patient Information

To help investigate unexplained flow of breast milk (galactorrhea), abnormal nipple discharge, absence of menstrual periods, and/or infertility in women; in men, to help diagnose the cause of decreased libido and/or erectile dysfunction; to detect and monitor a pituitary tumor that produces prolactin (prolactinoma).

When you have symptoms of elevated prolactin, such as vision problems and headaches; during a workup for infertility; for follow-up of macroprolactin; when a man has low testosterone; periodically to monitor for recurrence of a pituitary tumor.

A blood sample drawn from a vein.

None; however, the sample should be collected 3 to 4 hours after waking.