CNA Study Guide
CNA Medical Abbreviations: High-Yield Chart and Exam Meanings
CNA medical abbreviations memory card: ADL, NPO, PRN, qd/BID/TID/QID, TPR, I&O (1 oz = 30 mL), CBR, ROM, HOB, and look-alike traps.
By MedCertPrep Team · Updated August 5, 2026
This guide is a high-yield memory card for CNA medical abbreviations you will see on care plans, diet cards, vital-sign sheets, and written exam stems. It is organized by use case, not as an endless A-to-Z dump. Pair it with CNA ADLs, CNA vital signs, and drills in Physical Care and Role of the Nurse Aide.
Abbreviations support communication and documentation themes across the 2024 NNAAP Written Content Outline. Facilities keep approved abbreviation lists, and unsafe shortcuts can be banned. Confirm testing and handbook language on Credentia (Find My State) or Prometric. For NNAAP framing, see NCSBN NNAAP & MACE.
How should you study CNA abbreviations?
Do not memorize a 200-item list in random order. Study by the decisions you make on shift and on stems:
- Does this order change what the resident can eat or drink?
- Does this order change how often I assist or reposition?
- Does this note change mobility, privacy, or report urgency?
- Could two similar abbreviations mean opposite things?
Pro Tip: Learn the abbreviation with one action.
NPOis not just "nothing by mouth." It is "do not give food or drink; check with the nurse before any oral intake."
What ADL and mobility abbreviations are highest yield?
| Abbreviation | Meaning | CNA action cue |
|---|---|---|
| ADL / ADLs | Activities of Daily Living | Bathing, dressing, toileting, eating, mobility help |
| amb / AMB | Ambulate / walk | Assist to walk per care plan; use gait/transfer belt when required |
| CBR | Complete bed rest | Keep the resident in bed unless the nurse clarifies an exception |
| OOB | Out of bed | Follow transfer and footwear rules before standing |
| BRP | Bathroom privileges | Assist safely; watch for dizziness and fall risk |
| ROM | Range of motion | Support joints; never force past pain; report pain |
| PROM | Passive range of motion | CNA moves the joint for the resident as trained |
| w/c | Wheelchair | Lock wheels before transfers |
| wt / ht | Weight / height | Measure and record as assigned; report sudden weight change |
| vs / VS | Vital signs | Measure and record; report abnormal values |
Contrast trap: CBR means stay in bed; OOB means get out of bed; BRP allows bathroom trips while still limiting other activity. Read the care plan before you encourage walking.
Related deep dives: CNA ADLs, CNA transfers and gait belt.
What timing and frequency abbreviations must you know?
| Abbreviation | Meaning | Memory cue |
|---|---|---|
| PRN | As needed | Not on a fixed clock; given when required per order/care plan |
| qd / QD | Once a day | q = every, d = day |
| BID | Twice a day | 2 times (bi = two) |
| TID | Three times a day | 3 times (tri = three) |
| QID | Four times a day | 4 times (quad = four) |
| qh / q1h | Every hour | Watch the schedule closely |
| q2h | Every 2 hours | Common reposition / check interval on stems |
| q4h | Every 4 hours | Common vital-sign or comfort interval |
| qhs / HS | At bedtime / hour of sleep | Evening care timing |
| ac | Before meals | Nutrition timing |
| pc | After meals | Nutrition timing |
| ad lib | As desired / as tolerated | Still within safety and care-plan limits |
| stat | Immediately | Urgent; do not delay reporting or assigned action |
Look-alike trap: BID / TID / QID are easy to swap under time pressure. Count the number first, then choose the answer. qd is once daily, not "as needed" (PRN).
What nutrition, fluid, and elimination abbreviations appear most?
| Abbreviation | Meaning | CNA action cue |
|---|---|---|
| NPO | Nothing by mouth | No food or drink unless the nurse clarifies an exception |
| PO | By mouth | Oral intake route |
| I&O | Intake and output | Measure/record fluids and output as assigned |
| ml / mL / cc | Milliliter / cubic centimeter | Same volume idea in many training contexts; follow facility units |
| oz | Ounce | Common conversion on stems: 1 oz = 30 mL (or 30 cc) |
| NAS | No added salt | Diet card matters before feeding |
| NCS | No concentrated sweets | Common diabetic diet cue on trays |
| BM | Bowel movement | Report unusual frequency, blood, or no BM when asked to monitor |
| UA / U/A | Urinalysis | Specimen handling per nurse direction |
| Foley | Indwelling urinary catheter (common shorthand) | Catheter care clean-to-dirty; do not pull tubing |
Before feeding, verify the tray against the name and diet card. NPO overrides habit. Details: CNA ADLs.
What vital sign and position abbreviations should you lock in?
| Abbreviation | Meaning | CNA action cue |
|---|---|---|
| TPR | Temperature, pulse, respiration | Classic vitals trio on flow sheets |
| BP | Blood pressure | Correct cuff placement; report extremes |
| HR / P | Heart rate / pulse | Usually radial for CNAs |
| R / RR | Respirations / respiratory rate | Count full minute on many skills listings |
| T / temp | Temperature | Note site if required (oral, axillary, rectal) |
| SpO2 / O2 sat | Oxygen saturation | Report low readings and distress |
| HOB | Head of bed | Raise/lower per order (for example HOB elevated for feeding) |
| SOB | Shortness of breath | Stay with resident as needed; report promptly |
| c/o | Complains of | Chart/report the resident's stated symptom |
| R | Right, rectal, or respiration | Read the full stem; context decides which meaning |
| L | Left | Side of body, laterality, or left-sided positioning |
Vitals method and ranges: CNA vital signs.
What charting, team, and safety abbreviations show up on Role stems?
| Abbreviation | Meaning | CNA action cue |
|---|---|---|
| RN / LPN / LVN | Registered / licensed nurse roles | Report up the chain; do not practice outside CNA scope |
| MD / provider | Physician / licensed provider | CNAs do not take verbal med orders independently |
| Dx | Diagnosis | Confidential; need-to-know only |
| Hx | History | Confidential |
| Fx | Fracture | Handle the affected side carefully; follow care plan |
| DNR | Do not resuscitate | Follow facility code status process; do not invent steps |
| PPE | Personal protective equipment | Don/doff per listing and precautions |
| MRSA | Methicillin-resistant Staph aureus | Follow posted contact precautions |
| C. diff / CDI | Clostridioides difficile infection | Soap and water hand hygiene after care |
Infection-control detail: CNA infection control. Rights and confidentiality: CNA resident rights.
Which abbreviation traps fail CNA exam stems?
| Trap | Safer reading |
|---|---|
| Mixing up NPO and PO | NPO = nothing by mouth; PO = by mouth |
| Mixing BID and QID | 2 times vs 4 times |
| Mixing qd and PRN | Once a day vs as needed |
| Treating CBR like OOB | Complete bed rest vs out of bed |
| Treating PRN like a fixed schedule | As needed, within the order and care plan |
| Ignoring HOB elevation for feeding | Upright / elevated head reduces aspiration risk |
| Misreading R without context | Right, rectal, or respiration; use the full stem |
| Sharing Dx in the hallway | Confidentiality violation |
| Guessing a banned or unclear abbreviation | Ask the nurse; use facility-approved terms |
If an abbreviation is unclear on a real chart, do not guess. Clarify with the nurse before acting.
How can you remember abbreviations faster?
Use three short habits instead of a random A-to-Z list:
- q means every.
qd= every day,q2h= every 2 hours,qhs= at hour of sleep. - Count BID / TID / QID. bi = 2, tri = 3, quad = 4. Say the number before you pick the answer.
- Pair opposites. NPO vs PO, CBR vs OOB, BID vs QID. One contrast card beats five isolated cards.
Practice one scene sentence aloud: "Resident is NPO before a procedure, VS q4h, I&O recorded in mL (1 oz = 30 mL), and BRP only if the care plan allows."
How should you practice abbreviations this week?
- Make 20 flash cards from the tables above, grouped by category.
- For each card, write one CNA action, not only the definition.
- Drill feeding/diet stems with
NPO, diet cards, andHOBelevation. - Drill vitals stems with
TPR,BP, and report cues. - Practice recognition inside Physical Care and Role of the Nurse Aide.
- Keep a short daily review block on the 4-week study plan.
How this guide connects to MedCertPrep
| Need | Link |
|---|---|
| ADL context | CNA ADLs |
| Vitals context | CNA vital signs |
| Infection / PPE terms | CNA infection control |
| Rights / confidentiality | CNA resident rights |
| Transfers / mobility terms | CNA transfers and gait belt |
| Skills checklist | CNA skills test |
| Domain blueprint | CNA study guide |
| Pass method | How to pass the CNA |
| Calendar | 4-week CNA study plan |
| Eligibility / handbooks | CNA requirements |
| Free diagnostic | Try CNA |
| All practice | CNA practice |
| Exam overview | CNA |
| Paid access | Pricing |
| Official written outline | 2024 NNAAP Content Outline |
| Credentia handbooks | credentia.com |
| Prometric portal | prometric.com |
| NCSBN NNAAP page | NNAAP & MACE |
Frequently Asked Questions
What does ADL mean?
Activities of Daily Living: basic self-care tasks such as bathing, dressing, eating, toileting, and mobility.
What does NPO mean?
Nothing by mouth. Do not give food or drink unless the nurse clarifies an approved exception.
What does PRN mean?
As needed. It is not the same as a fixed BID or TID schedule.
How do BID, TID, and QID differ?
BID = 2 times a day, TID = 3 times a day, QID = 4 times a day. qd means once a day.
What is TPR?
Temperature, pulse, and respiration. Often charted together on vital-sign sheets.
What is I&O?
Intake and output: fluids taken in and fluids put out, measured and recorded as assigned. On many stems, 1 oz = 30 mL (or 30 cc).
What does CBR mean?
Complete bed rest. Do not get the resident out of bed unless the nurse clarifies an exception. Do not confuse with OOB (out of bed) or BRP (bathroom privileges).
Should I use every abbreviation I see online?
No. Use facility-approved abbreviations and clarify unclear charting with the nurse. Exam stems usually stick to common, unambiguous terms.
Where do official exam materials live?
Open Credentia and choose Find My State, or open Prometric and select your exam and state. Use NCSBN for NNAAP framing.
Lock the abbreviation card today
- Master
NPO,PRN,qd,BID/TID/QID,ADL,TPR,I&O(including 1 oz = 30 mL),ROM, andHOBwith one action each. - Add mobility terms:
amb,CBR,OOB,BRP,w/c. - Drill three look-alike pairs: NPO vs PO, BID vs QID, CBR vs OOB.
- Complete a mixed set in Physical Care.
- Review rights/confidentiality terms in Role of the Nurse Aide.
Abbreviations save time only when the meaning and the next safe action are both automatic.
Practice what you just read
Use blueprint-aligned questions and timed mocks for CNA to turn this guide into exam-day readiness.