Preoperative evaluations are recommended for patients of all ages who are scheduled for elective surgeries or nonsurgical procedures requiring general anesthesia, regional anesthesia, or moderate to deep sedation. For procedures considered to be very low risk, such as dental extractions or cataract surgery, the evaluation might simply involve confirming the absence of significant risk factors, particularly in patients with no concurrent medical issues. In some cases, screening these patients over the phone might be adequate, and the evaluation could be limited to the oral surgeon or ophthalmologist verifying that there are no significant risk factors present.
Guidelines suggest avoiding routine baseline laboratory studies in patients without significant systemic diseases (classified as ASA physical status I or II) undergoing low-risk surgery, especially when minimal blood loss or fluid shifts are anticipated. This includes tests like complete blood count, basic metabolic panel, and coagulation studies.
For more complex surgeries or patients with comorbidities such as cardiac, thoracic, vascular, or neurological conditions, a more thorough preoperative assessment is necessary. These patients should undergo optimization for their procedures. The purpose here is to assess the current level of known diseases and to uncover any asymptomatic or latent conditions, like silent heart disease, anemia, or kidney disease, which could influence the safety and approach to the surgical procedure and anesthesia. The extent of preoperative testing should be guided by the patient's clinical condition and any abnormalities found during their medical history or physical examination.
