Final answer:
The medical assistant should ensure that the expiration date on disposable thermometers has not passed to guarantee they are ready for use. These single-use items do not require autoclaving or alcohol swabbing, but it is important to maintain their validity.
Step-by-step explanation:
To ensure that disposable thermometers are ready for an exam, the medical assistant should ensure the expiration date has not passed. Unlike equipment that requires sterilization, such as metal forceps or inoculating loops which must be autoclaved, disposable thermometers are designed for single use and should be checked for validity before use. Sterilization methods, such as autoclaving, are not suitable for disposable items and items like probe covers should be used to maintain hygiene between patients. It is not necessary to swab the tips with alcohol or to store them in a locked cabinet for the purpose of ensuring readiness.