the study aims to messure the vitamin D levels in medical staff in the hospital. The physicians in the course of their internship who work indoors and work many night shifts have limited sun exposure in all seasons. Nursing staff who work shifts and work indoors are at the same risk of liltle sun exposure. The study addresses the amount of sun exposure, assessed by a sun exposure questioner, age, gender,work load related to number of shifts in the physicien group and in nursing group the job percentile we also adress religion (clothing cover)as a factor.