###Human: Kindly explain about the normal blood sugar level in a heart surgery patient. ###Assistant: Hello. Normal fasting glucose levels are the same for all types of patients, persons of different age group. The range of fasting glucose is 70 to 100 mg/100 ml (earlier upper margin was allowed up to 110 mg). The usual levels measured are fasting (10 plus hours after dinner) and after food or PP level ( two hours after food). Your terminology is not correct (before fasting and after fasting). Normal PP (postprandial) level is less than 140 mg/100 ml for all persons including one going for any surgery.