PMHx stands for which phrase?

• A. Past medication history
• B. Patient medical history
• C. Past medical history
• D. Primary medical history

Answer: (C)

PMHx stands for Past Medical History. This is the concise record of the patient’s prior medical conditions that may influence treatment choices, drug selection, and dosing in the current situation. In prehospital care, knowing PMHx helps you anticipate contraindications or drug interactions and adjust pharmacology accordingly (for example, a history of heart disease, diabetes, or asthma can change which medications are safest or how they’ll affect the patient). The other phrases describe different things—past medication history refers to drugs the patient has taken before, while the nonstandard terms aren’t used as the standard shorthand—so the best fit is Past Medical History.