I noticed today (for the first time!) that in UMSLE world questions Lab values there two (2) different values for Alkaline Phosphatase:

1. Alkaline Phosphatase, serum

Male: 30-100 U/L
Female: 45-115 U/L

2. Phosphatase (alkaline), serum (p-NPP at 30C)

20-70 UL/L

Can someone please clarify what is this about?

Thank you so much!!