Figure 25-19 Two standards published by the American Society of Anesthesiologists (ASA) in the ASA Directory of Members 1998. (A) Statement on routine preoperative laboratory and diagnostic screening. The routine use of laboratory or diagnostic screening tests is not an essential part of the preanesthetic evaluation of patients. (B) Basic standards for preanesthesia care. The history, physical examination, and chart review are essential when obtaining tests as part of preanesthesia care. (From American Society of Anesthesiologists The ASA Directory of Members, 1998. Park Ridge, IL. American Society of Anesthesiologists, 1998.)