Preoperative investigations for elective surgical patients in a resource limited setting: Systematic review.

Background: Preoperative investigation for surgical patients is important to check for conditions that may affect surgical outcome. It helps the anesthetist and surgeon to plan perioperative anesthesia and surgical management appropriately. However, 60-70% of laboratory tests before surgery are not really required. This review was conducted to develop evidence-based recommendations on preoperative investigations for patients waiting for surgery in a resource limited setting. Methods: After formulating the key questions, scope, and eligibility criteria for the articles to be included, advanced search strategy of electronic sources from data bases and websites was conducted. Duplication of literatures was avoided by endnote. Screening of literatures was conducted with proper appraisal. This review was reported in accordance with the preferred reporting items for systematic reviews and meta-analysis (PRISMA) 2020 statement. Results: A total of 553 articles were identified from data bases and websites using an electronic search. 75 articles were removed for duplication and 223 studies were excluded after reviewing titles and abstracts. At the screening stage, 82 articles were retrieved and evaluated for eligibility. Finally, 46 studies met the eligibility criteria and were included in this systematic review. Conclusion: and recommendation: Selective laboratory ordering reduces the number and cost of investigations. Preoperative tests should be guided by the patient's clinical history, co-morbidities, and physical examination. Patients with signs or symptoms of certain types of disease should be evaluated with appropriate testing. Therefore, adherence to recommendations of guidelines on preoperative investigation is important for good surgical outcome and patient satisfaction.