yup, off, everything has to come off, under your nails harbours more germs and bacteria then an average toilet seat, and that in a sterile theatre alone is bad news, also they need to have a monitor on your finger that needs to read your pulse and cant properly with nails on
i took mine off and bought cheap glue on ones, that i just pinged off the night before my op, and stuck another set back on after the op until i got to the nail bar. without my nails i dont feel me, and i cant use normal things like my phone xx