Prior to sleeve gastrectomy, patients undergo a comprehensive series of evaluations. These assessments aim to identify and address any potential contraindications, such as gastric ulcers or cardiovascular conditions, which could impede the surgery. Issues that might prevent the operation are resolved first, ensuring the patient is medically optimized for the procedure. In some cases, these preparatory treatments may extend over several months. Additionally, a multidisciplinary team, including dietitians, psychologists, and psychiatrists, assesses the patient's suitability for surgery. The primary objective is to ensure the patient undergoes obesity surgery safely and without complications.

Patients are typically admitted to the hospital on the day of the surgery. The post-operative hospital stay usually lasts 2-3 days.

For patients with significant weight issues, particularly those with prominent fatty liver, a specialized pre-operative diet program lasting 10-15 days may be prescribed. This specific dietary regimen aims to reduce liver size, thereby making the surgical procedure safer and less complex.