<qa>  What is the essence of preventive antibiotic treatment?Preventive antibiotic treatment before performing invasive procedures is a basic element in preventing infections. The essence of preventive antibiotic treatment is strengthening the defense mechanisms of the immune system by preserving a certain drug levels in the blood. The timing of giving the antibiotics is very important. Several research groups have tried to check the levels of Cefazolin the most common antibiotics in the field of obstetrics in serum and adipose tissue in women during cesarean. These groups presented conflicting research results. 