How does a phlebotomist determine that a patient is NPO?

A phlebotomist determines that a patient is NPO (nothing by mouth) by reviewing the patient's medical records or orders, where NPO status is typically documented. Additionally, they may confirm with the patient directly, asking if they have consumed any food or drink prior to the scheduled test. It's essential for the phlebotomist to verify this status to ensure accurate test results and patient safety.