The Ultimate Guide to
Medical Abbreviations
for Nursing Students

Clinical notes are packed with shorthand that takes years to feel natural. This guide breaks down the most important abbreviations by category — so you can read a chart without freezing up.

On your first clinical rotation, you'll encounter a patient chart that reads something like: "Pt c/o SOB, DOE, and bilateral LE edema. PMH significant for CHF and DM2. Current meds include HCTZ and metoprolol. O2 sat 91% on RA. Plan: CXR, BMP, strict I&O."

If that sentence took you more than ten seconds to parse, you're not alone — and you're exactly who this guide is for. Medical abbreviations aren't tested as a standalone topic in most nursing programs, but fluency with them is expected the moment you step onto a floor.

Below is a working reference organized by the contexts where you'll actually encounter them.

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Free Medical Abbreviation Decoder

Paste any clinical note and every abbreviation is highlighted and defined inline. No signup needed.

Vital Signs & Assessment

These appear in nearly every nursing note and handoff report. They should become second nature within your first few weeks of clinical practice.

AbbreviationMeaning
BPBlood pressure
HRHeart rate
RRRespiratory rate
T / TempTemperature
SpO2 / O2 satOxygen saturation (pulse oximetry)
RARoom air (no supplemental oxygen)
GCSGlasgow Coma Scale
LOCLevel of consciousness
A&Ox3Alert and oriented to person, place, and time
PERRLPupils equal, round, and reactive to light
WNLWithin normal limits
NADNo acute distress

Common Symptoms & Complaints

These show up in the subjective section of notes and in triage documentation. Learning to read them quickly helps you prioritize during handoff.

AbbreviationMeaning
c/oComplains of / chief complaint
SOBShortness of breath
DOEDyspnea on exertion
CPChest pain
N/VNausea and vomiting
HAHeadache
LELower extremity
UEUpper extremity
Bilat / b/lBilateral (both sides)
ΔChange
↑ / ↓Increased / decreased

Medical History & Diagnoses

The PMH (past medical history) section of a chart is dense with diagnosis abbreviations. These are the ones you'll see most often in general medical-surgical settings.

AbbreviationMeaning
PMHPast medical history
HTNHypertension
DM / DM2Diabetes mellitus / Type 2 diabetes
CADCoronary artery disease
CHFCongestive heart failure
COPDChronic obstructive pulmonary disease
CKDChronic kidney disease
CVACerebrovascular accident (stroke)
TIATransient ischemic attack
PEPulmonary embolism
DVTDeep vein thrombosis
GERDGastroesophageal reflux disease
UTIUrinary tract infection
MIMyocardial infarction (heart attack)

Medication & Orders

Medication administration is where abbreviation errors are most dangerous. Many organizations have moved to full wording on medication orders, but you'll still encounter these in verbal handoffs and older documentation.

⚠️ The Joint Commission's "Do Not Use" list includes abbreviations that have caused medication errors — including U (for units), IU (international units), QD/QOD, and trailing zeros like 1.0 mg. Know these, and know why they're dangerous.

AbbreviationMeaning
POBy mouth (oral)
IVIntravenous
IMIntramuscular
SQ / SubQSubcutaneous
SLSublingual (under the tongue)
PRNAs needed
STATImmediately
BIDTwice daily
TIDThree times daily
QIDFour times daily
NPONothing by mouth
NKA / NKDANo known allergies / no known drug allergies
RxPrescription / treatment
DxDiagnosis
HxHistory
SxSymptoms
TxTreatment

Labs & Diagnostics

AbbreviationMeaning
CBCComplete blood count
BMPBasic metabolic panel
CMPComprehensive metabolic panel
BNPB-type natriuretic peptide (heart failure marker)
ABGArterial blood gas
UAUrinalysis
C&SCulture and sensitivity
CXRChest X-ray
EKG / ECGElectrocardiogram
CTComputed tomography
MRIMagnetic resonance imaging
I&OIntake and output
Hgb / HbHemoglobin
HctHematocrit
BG / BSBlood glucose / blood sugar
K+Potassium
Na+Sodium
CrCreatinine
BUNBlood urea nitrogen
INRInternational normalized ratio (clotting)

The Fastest Way to Decode a Clinical Note

When you're on rotation and encounter an abbreviation you don't know, you don't always have time to Google it in context. Our Medical Abbreviation Decoder lets you paste an entire clinical note — or just a fragment — and highlights every recognized abbreviation with its full definition inline. It's designed for exactly the moment when a supervisor hands you a chart and asks you to summarize it.

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Try the Medical Abbreviation Decoder

Paste any clinical note and get every abbreviation defined inline. Free, no account needed.

Further Learning

These are reputable resources used by nursing and medical programs across the country for building clinical documentation fluency:

Summary


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