6.1 Vital Signs: Ranges & Technique
Key Takeaways
- Normal adult ranges: oral temperature about 97.8-99.1°F, pulse 60-100 bpm, respirations 12-20 per minute, blood pressure roughly 90-130 systolic / 60-89 diastolic mmHg.
- On the NNAAP/Prometric skills test, count an irregular or required pulse a full 60 seconds and record within ±4 beats; count respirations a full 60 seconds and record within ±2 breaths; record manual BP within ±8 mmHg of the evaluator.
- Count respirations without telling the resident, because awareness changes the breathing pattern; use the radial site with two or three fingers (never the thumb) for routine pulse.
- Place the blood-pressure cuff on the bare upper arm; never use an arm with an IV, dialysis access, injury, cast, or a mastectomy on that side.
- The Florida CNA collects and records vital signs accurately and reports abnormal values immediately — the CNA does not diagnose or treat.
Vital Signs Are the Most Tested Skill Set
Vital signs are measurements that show how the body's basic life-sustaining functions — temperature regulation, heart action, breathing, and circulation — are working. They are the single most heavily tested cluster on the Florida CNA exam, appearing both on the written (or oral) test of about 60 multiple-choice questions and on the clinical skills test, where measuring a radial pulse, counting respirations, and taking a manual blood pressure are among the most commonly assigned and most commonly failed skills.
The Florida CNA exam is administered by Prometric under contract with the Florida Department of Health, and the clinical portion follows the NNAAP (National Nurse Aide Assessment Program) skill checklists. The CNA's job is narrow and precise: measure accurately, record immediately, and report abnormal results to the nurse. CNAs do not interpret trends, diagnose, or adjust care. A wrong number can send the whole care team in the wrong direction, so accuracy matters more than speed.
Normal Adult Reference Ranges
| Vital Sign | Normal Adult Range |
|---|---|
| Temperature (oral) | About 97.8-99.1°F (36.5-37.3°C); the textbook average is 98.6°F |
| Pulse (P) | 60-100 beats per minute |
| Respirations (R) | 12-20 breaths per minute |
| Blood pressure (BP) | Roughly 90-130 systolic / 60-89 diastolic mmHg; 120/80 is ideal |
| Oxygen saturation (SpO2) | Follow facility range and nurse direction (commonly 95% or higher) |
One respiration equals one full inhalation plus one exhalation. Temperature varies by route: rectal runs roughly 1°F higher than oral, axillary (armpit) roughly 1°F lower, and tympanic (ear) and temporal (forehead) approximate core temperature.
When to Measure
Measure on admission, at the start of a shift, before and after activity or certain procedures, after a fall, when the resident feels unwell or changes condition, and whenever the nurse or care plan directs. Wash your hands before and after, and clean shared equipment between residents.
Correct Technique by Vital Sign
Temperature
Match the route to the resident and the device. Do not take an oral temperature within 15-30 minutes of hot or cold fluids, eating, or smoking, and never orally on residents who are unconscious, confused, uncooperative, or receiving oxygen by mask. Use axillary or tympanic routes when oral is unsafe. Report a fever (about 100.4°F / 38°C or higher), an abnormally low temperature, or any sudden change, along with chills, sweating, flushing, or new confusion.
Pulse
Use the radial site (thumb side of the wrist): place two or three fingers on the artery — never the thumb, which has its own pulse you could mistake for the resident's. Count 30 seconds × 2 for a regular pulse, but a full 60 seconds for an irregular pulse or whenever the skills test directs. Note rate, rhythm, and force (strong, weak, bounding). The apical pulse (heard with a stethoscope over the heart's apex) is counted a full minute and used when the pulse is irregular or before certain medications.
Respirations
Count respirations without telling the resident — keep your fingers on the wrist as if still taking the pulse, because breathing is partly voluntary and an aware resident may speed up, slow down, or breathe more deeply. Count the rise and fall of the chest (one rise + one fall = one respiration) for a full 60 seconds on the skills test. Note depth, rhythm, and effort. Report labored, noisy, shallow, or very rapid breathing, bluish (cyanotic) color, or inability to speak in full sentences.
Blood Pressure
Place the cuff snugly on the bare upper arm about one inch above the elbow, arm supported at heart level. Never use an arm with an IV line, dialysis access (fistula or graft), injury, cast, paralysis, or on the side of a mastectomy. Use the correct cuff size — a too-small cuff reads falsely high. Deflate slowly at about 2-3 mmHg per second; the first clear tapping sound is systolic and the point the sound disappears is diastolic.
The Clinical Skills Test: Accuracy Tolerances
On the NNAAP/Prometric clinical skills exam, the measure-and-record vital-sign skills are scored partly on accuracy against the evaluator's own reading. Memorize these tolerances — being outside them fails the skill:
| Measure-and-Record Skill | Counting / Method | Accuracy Tolerance |
|---|---|---|
| Radial pulse | Count a full 60 seconds | Within ±4 beats of the evaluator |
| Respirations | Count a full 60 seconds | Within ±2 breaths of the evaluator |
| Manual blood pressure | Inflate ~160-180 mmHg, deflate slowly | Within ±8 mmHg (systolic and diastolic) of the evaluator |
The skills test also requires handwashing/hand hygiene as a graded skill that pairs with the others, and rewards keeping the resident comfortable, informed, and safe (call light in reach, bed low) throughout.
Report Immediately When
| Vital Sign | Report If |
|---|---|
| Temperature | Above ~101°F or below ~97°F, or sudden change |
| Pulse | Above 100 or below 60 (unless that is the resident's baseline) |
| Respirations | Above 24 or below 12, or labored/noisy |
| Blood pressure | Systolic above ~160 or below ~90; diastolic above ~100 or below ~60 |
| Oxygen saturation | Below the facility threshold or the resident's baseline |
A value that is technically normal-range but a large change from the resident's baseline is still reportable; some residents have a stable baseline outside the textbook range.
Exam Tip
Vital-sign questions usually pair a measurement with a judgment. The correct CNA action is almost always measure accurately, record it, and report the abnormal finding to the nurse — not treat it, not recheck endlessly, and not decide it is unimportant.
On the Prometric/NNAAP clinical skills test, how close must your recorded radial pulse be to the evaluator's reading to pass?
Why should the CNA count respirations without telling the resident?
A resident has a dialysis fistula in the left arm and an IV in the right forearm. Where should the CNA take the blood pressure?
Which adult oral temperature should the CNA report to the nurse as a likely fever?