Overview
Clinical documentation is compact by necessity: charts, orders, and hand-off notes use abbreviations and symbols to record a great deal of information quickly. To work safely, you must be able to read these shorthand forms and, just as important, know which ones are dangerous. This lesson covers everyday abbreviations, how to read a basic note, and the safety principle behind the “Do Not Use” list maintained by The Joint Commission and the Institute for Safe Medication Practices (ISMP).
Common Clinical Abbreviations
| Abbreviation | Meaning |
|---|---|
| BP | Blood pressure |
| HR | Heart rate |
| RR | Respiratory rate |
| T | Temperature |
| SpO2 | Oxygen saturation |
| Hx | History |
| Dx | Diagnosis |
| Tx | Treatment |
| Rx | Prescription / therapy |
| Sx | Symptoms |
| c/o | Complains of |
| WNL | Within normal limits |
| SOB | Shortness of breath |
Medication and Timing Terms
Many order abbreviations come from Latin. A few are used constantly:
| Abbreviation | Meaning |
|---|---|
| PRN | As needed |
| Stat | Immediately |
| NPO | Nothing by mouth |
| BID | Twice a day |
| TID | Three times a day |
| QID | Four times a day |
| PO | By mouth |
| IV | Intravenous |
| IM | Intramuscular |
| ac | Before meals |
| pc | After meals |
| hs | At bedtime |
Common Symbols
| Symbol | Meaning |
|---|---|
| ↑ | Increased |
| ↓ | Decreased |
| ~ | Approximately |
| @ | At |
| > / < | Greater than / less than |
| Δ | Change |
Dangerous, Error-Prone Abbreviations
Some abbreviations are so easily misread that leading safety organizations recommend never using them; they should be written out in full. The core idea of the Joint Commission and ISMP “Do Not Use” list is that ambiguous shorthand causes real harm, especially in medication dosing.
| Avoid | Problem | Write instead |
|---|---|---|
| U | Mistaken for 0, 4, or cc | ”unit” |
| IU | Mistaken for IV or the number 10 | ”international unit” |
| QD / QOD | Confused with each other (daily vs every other day) | “daily” / “every other day” |
| Trailing zero (1.0 mg) | The decimal is missed, read as 10 mg | Write “1 mg” |
| No leading zero (.5 mg) | The decimal is missed, read as 5 mg | Write “0.5 mg” |
| MS, MSO4, MgSO4 | Morphine and magnesium sulfate confused | Write the full drug name |
The lesson of each row is the same: a small ambiguity can become a tenfold overdose. When in doubt, spell it out.
Reading a Basic Chart Note
Notes are often organized in the SOAP format, which keeps information in a predictable order:
- S — Subjective: what the patient reports (symptoms, history). Example: “Pt c/o SOB since this morning.”
- O — Objective: measurable findings and vital signs. Example: “BP 148/92, HR 104, RR 22, SpO2 91% on room air.”
- A — Assessment: the clinician’s interpretation or diagnosis. Example: “Likely asthma exacerbation.”
- P — Plan: what will be done next. Example: “Albuterol nebulizer stat; recheck SpO2; admit if no improvement.”
Reading this note, you can see the patient complains of shortness of breath, has an elevated heart and respiratory rate with low oxygen, is thought to be having an asthma flare, and will receive a breathing treatment immediately.
Principles of Safe Documentation
Good charting protects patients. Keep these habits:
- Be clear over clever — avoid ambiguous abbreviations; write out anything on a “Do Not Use” list.
- Handle decimals carefully — always use a leading zero (0.5), never a trailing zero (not 5.0).
- Be timely and factual — record what you observed and did, not opinions about the patient.
- Never alter a record — correct an error by drawing a single line through it, initialing, and adding the correction, so the original remains legible.
- If it was not documented, it was not done — complete, contemporaneous notes are the legal and clinical record of care.
Why It Matters
Documentation is how the care team communicates across shifts and settings. A misread abbreviation or a misplaced decimal point has caused serious medication errors, which is exactly why the ISMP and Joint Commission created their guidance. Learning to read clinical shorthand and to write clearly is a core safety skill for every EMT, nurse, and clinician, protecting patients long before any procedure begins.