The normal values for prolactin are as follows:

• Males and nonpregnant females: 0 to 20 ng/ml
• Pregnancy: 10 to 300 ng/ml

Prolactin levels can be elevated in the following conditions:

• Prolactinomas
• Other pituitary tumors and disease
• Hypothalamic disease
• Hypothyroidism
• Kidney disease
• Chest wall trauma or irritation
• Medication-related (estrogens, tricyclic antidepressants, metoclopramide, phenothiazines, butyrophenones, reserpine, methyldopa, H2 blockers)

If your prolactin levels are elevated, the test may be repeated following an 8-hour fast.