Facebook Pixel Code
Section banner image
Paediatric Laboratory Medicine

Prolactin, Blood

Clinical Significance

Human prolactin (hPRL) is a single chain polypeptide of 199 amino acids and a molecular weight of approximately 23,000 daltons Prolactin is produced by the anterior pituitary and its secretion is regulated physiologically by inhibitory 3 and releasing  factors of the hypothalamus. Prolactin appears in the blood promptly after administration of thyrotropin-releasing hormone (TRH). The major physiologic action of prolactin is the initiation and maintenance of lactation in women. Hyperprolactinemia has been established as a common cause of infertility and gonadal disorders in men and women. Prolactin has been shown to inhibit the secretion of ovarian steroids  and to interfere with follicle maturation 7 and the secretion of LH and FSH in the human female. Measurement of elevated serum prolactin levels may provide the first quantitative evidence of pituitary dysfunction. Quantitation of prolactin levels is also of interest in the evaluation and management of patients with amenorrhea and galactorrhea.

Test Name

Prolactin, Blood

Test Code



Biochemistry - Biochemistry


Abbott Ci4100

External Proficiency Testing


Turn Around Time

Monday to Friday

Specimen Type

Serum, Sodium/Lithium Heparin / Potassium EDTA plasma

Minimum Specimen Requirements

150 uL



Approval is not required

CPT Codes


Shipping and Contact Information

The Hospital for Sick Children
Rapid Response Laboratory
170 Elizabeth Street, Room 3642
Toronto, ON
M5G 2G3
Phone: 416-813-7200
Phone: 1-855-381-3212

Reference Range

4 - 30 days : 10.0 - 159.9 µg/L
1 month - < 1 year : 5.3 - 85.7 µg/L
1 - < 19 years : 3.7- 17.8 µg/L