Medical abbreviations are short forms used throughout health care to save time and keep notes consistent. You may see them on prescription labels, lab reports, discharge papers, visit summaries, and messages from your care team. This guide explains many common medical abbreviations in plain language, shows where they often appear, and offers tips for reading them safely. It is general education, not a substitute for instructions from your clinician.
Why medical abbreviations are used
Health care moves quickly, and shorthand helps professionals record information efficiently. Abbreviations also create a shared language among clinicians, pharmacists, nurses, and laboratory staff. However, the same letters can mean different things in different settings. A term that is clear in a medication list may mean something else in a radiology report. Always consider the context, and ask for clarification when something is unclear.
Vital signs and body measurements
Vital signs are often recorded with abbreviations at the start of a visit or in a hospital chart.
- BP means blood pressure, such as BP 120/80.
- HR means heart rate, usually measured in beats per minute.
- RR means respiratory rate, or breaths per minute.
- Temp means temperature.
- SpO2 means oxygen saturation, a measure of how much oxygen your blood is carrying.
- BMI means body mass index, a screening measure based on height and weight.
These values are usually interpreted together and in the context of your health history. A single number rarely tells the whole story.
Common lab and test abbreviations
Laboratory reports and test orders often use abbreviations. Some of the most common include:
- CBC means complete blood count, which measures parts of the blood such as red cells, white cells, and platelets.
- BMP means basic metabolic panel, a group of tests that checks electrolytes, kidney function, and blood sugar.
- CMP means comprehensive metabolic panel, which includes the BMP plus liver-related tests.
- A1C means hemoglobin A1c, a test that reflects average blood sugar over time.
- LFTs means liver function tests.
- TSH means thyroid-stimulating hormone, a common thyroid test.
- UA means urinalysis, a urine test.
- PT/INR refers to clotting tests often used to monitor certain blood-thinning medications.
- ECG or EKG means electrocardiogram, a recording of the heart’s electrical activity.
- EEG means electroencephalogram, a recording of brain electrical activity.
- MRI means magnetic resonance imaging.
- CT means computed tomography, sometimes called a CT scan.
- US or U/S may mean ultrasound.
Test names can vary by laboratory and location, so reports often include a short description or reference range.
Diagnoses and conditions
Visit summaries and problem lists may use abbreviations for health conditions. Common examples include:
- HTN means hypertension, or high blood pressure.
- DM means diabetes mellitus; you may also see type 1 or type 2 specified.
- CAD means coronary artery disease.
- CHF means congestive heart failure.
- COPD means chronic obstructive pulmonary disease.
- MI means myocardial infarction, commonly called a heart attack.
- CVA means cerebrovascular accident, commonly called a stroke.
- UTI means urinary tract infection.
- URI means upper respiratory infection.
- GERD means gastroesophageal reflux disease.
- OA means osteoarthritis.
- RA means rheumatoid arthritis, though in other contexts it can mean room air.
Context matters a great deal. For example, MS may refer to multiple sclerosis in a neurology note, mitral stenosis in a cardiology note, or morphine sulfate in a medication order. This is one reason clinicians are encouraged to spell out ambiguous terms.
Medication and prescription abbreviations
Prescription labels and medication lists use many abbreviations. These are common:
- Rx means prescription.
- OTC means over-the-counter.
- PO means by mouth.
- IV means intravenous, or into a vein.
- IM means intramuscular, or into a muscle.
- SC or SubQ means subcutaneous, or under the skin.
- SL means sublingual, or under the tongue.
- PRN means as needed.
- BID means twice daily.
- TID means three times daily.
- QID means four times daily.
- QD means once daily, but it can be confused with QID, so many health systems avoid it.
- QHS means at bedtime.
- NPO means nothing by mouth.
- STAT means immediately or right away.
- NSAID means nonsteroidal anti-inflammatory drug.
Medication abbreviations are especially important to confirm. Never change how you take a medicine based only on an abbreviation you do not recognize. Ask a pharmacist or prescriber to explain the instructions in full.
Visit notes and care instructions
Clinical notes often include shorthand about your history and plan. You may see:
- H&P means history and physical.
- Dx means diagnosis.
- Tx means treatment.
- Hx means history.
- Sx means symptoms.
- SOB means shortness of breath.
- F/U means follow-up.
- NKA means no known allergies.
- NKDA means no known drug allergies.
- PMH means past medical history.
- PSH means past surgical history.
- HPI means history of present illness.
These abbreviations help organize information, but they can feel like a code to readers who are not familiar with them. Patient portals and after-visit summaries may include a legend or plain-language explanation.
Abbreviations that can be confusing or unsafe
Some abbreviations are known to cause confusion because they look or sound alike. QD and QID are a classic example: once daily versus four times daily. U for units can be misread, so many systems require the word units to be written out. MS, PT, and CP can each have several meanings depending on the setting. For safety, health organizations often recommend spelling out high-risk terms and avoiding certain shorthand entirely.
How to read medical abbreviations safely
- Use context. Check whether the abbreviation appears in a vital signs section, lab report, medication list, or diagnosis list.
- Look for a key. Some reports include a legend or expanded terms.
- Ask for clarification. It is always reasonable to ask your care team to spell out anything you do not understand.
- Keep an updated medication list. Include the medicine name, dose, and directions as written, and review it with a pharmacist if needed.
- Do not guess. Avoid acting on an abbreviation that could have more than one meaning.
- Use secure messaging or a visit summary. Ask for plain-language explanations you can keep for reference.
Key takeaways
Medical abbreviations are a practical shorthand, but they are not always self-explanatory. Common terms cover vital signs, lab tests, imaging, diagnoses, medications, and visit notes. Some abbreviations can be ambiguous, so context and confirmation matter. Understanding the basics can help you feel more confident when reviewing health information and asking useful questions. If anything in your records or instructions is unclear, ask your clinician or pharmacist to explain it. For more plain-language guidance on health topics, explore related articles in our library.