I was marked for my temporary loop Ostomy, my end Ostomy and even before my hernia surgery. The nurse’s asked many questions about what clothing I usually wear, do I wear belts, what type underwear etc… she had me sit and stand several times and marked 3 possible sites. I think they took into consideration a lot of different factors when marking. I was lucky to have highly trained nurses. I had my temp put on the right and now my end ileostomy is on the left. With my hernia surgery they decided to leave the one I have in the left.