Which abbreviation stands for 'history of'?

The abbreviation that stands for 'history of' is H/O. This abbreviation is commonly used in medical documentation to indicate a patient's previous medical conditions or significant past experiences that are relevant to their current health status. For example, a notation might read "H/O hypertension," meaning the patient has a history of high blood pressure.

In contrast to this, Sx refers to symptoms, P/O stands for postoperative or point of origin, and R/O is typically used to mean "rule out." Understanding these abbreviations is essential for effective communication in healthcare settings, particularly in patient records and treatment planning.