What are the lab. investigation prior to gastric sleeve surgery?

Fairly Extensive: You need to check with your doctor about their routine labs but typically it involves - complete blood count, metabolic profile, coagulation profile, lipid profile, thyroid function tests, and ferritin (iron). Other tests include ekg, maybe a stress test, chest x-ray, arterial blood gas, and pulmonary function tests. If sleep apnea is a concern possibly a sleep study. Upper endoscopy is common.

Labs: Full blood count and chemistry, ekg, chest x-ray, urinalysis and culture. Your surgeon may require medical clearance as well. Some may require some evaluation of your nutritional state like you protein and albumin.