Which of the following is an abbreviation for "immediately"?

The abbreviation "stat" is derived from the Latin word "statim," which means "immediately." In medical and nursing contexts, it is commonly used to indicate that a task or intervention should be performed without delay. For example, if a healthcare provider orders a medication to be given "stat," it underscores the urgency and importance of administering the medication right away to respond to a critical situation.

This understanding is crucial in a clinical setting, where timely actions can significantly impact patient outcomes. In contrast, the other abbreviations—like "hs" for "at bedtime," "ad lib" meaning "as desired," and "PO" for "by mouth"—do not convey the same immediacy and are related to different instructions or timing for patient care.