What are Normal Prolactin Levels?

The normal values for prolactin are: 

1. Men: less than 20 ng/mL (425 µg/L)
2. Nonpregnant women: less than 25 ng/mL (25 µg/L)
3. Pregnant women: 80 to 400 ng/mL (80 to 400 µg/L)