Which of the following factors is NOT measured by the Aldrete scale to determine readiness for discharge?

The Aldrete scale is a scoring system used to assess a patient's readiness for discharge from the post-anesthesia care unit. It evaluates several important criteria to ensure that the patient has sufficiently recovered from anesthesia. Key factors measured include circulation, patient mobility, respiratory status, and consciousness.

Circulation is assessed to ensure that the patient has stable vital signs and adequate blood flow. Patient mobility is measured to confirm that the patient can move, which indicates recovery from the effects of anesthesia on motor function. Respiratory status includes evaluation of the patient's ability to breathe adequately and maintain normal respiratory function after surgery.

Pulse oximetry, however, while it can be an important aspect of monitoring a patient's overall respiratory function, is not directly included as a specific criterion on the Aldrete scale. The scale focuses more specifically on observable behaviors and functions rather than on numerical readings from monitoring devices. Hence, pulse oximetry measurement does not form a part of the Aldrete criteria indicating readiness for discharge.