Measuring and Recording Vital Signs

Why Vital Signs Matter

Vital signs are measurements of the body's most basic functions. They are the earliest objective clues that a resident's condition is changing. The four classic vital signs are temperature (T), pulse (P), respirations (R), and blood pressure (BP) — often charted as TPR and BP. Oxygen saturation (SpO2) and pain are frequently added; height and weight are tracked as part of nutritional status.

Why it matters for the exam: Vital signs sit inside the Basic Nursing Skills domain (~25%) and overlap heavily with Physical Care. The Massachusetts D&S/Headmaster skills test commonly includes a manual blood pressure, radial pulse, respirations, or weight task scored to exact technique. The written exam tests the normal adult ranges and whether you know to report an abnormal value.

Normal Adult Ranges (Memorize These)

Temperature varies by route: rectal and temporal run about 1°F higher and axillary about 1°F lower than oral. Rectal is the most accurate but contraindicated after rectal surgery, with diarrhea, or in some cardiac residents.

Pulse and Respirations

The radial pulse (thumb-side of the wrist) is the routine site. Press gently with your index and middle fingers — never the thumb, which has its own pulse. Count for a full 60 seconds if irregular, or 30 seconds × 2 if regular. Note rate, rhythm (regular/irregular), and force (strong/weak/bounding/thready).

The apical pulse is taken with a stethoscope at the heart's apex — 5th intercostal space, left midclavicular line — for a full minute. It is used for irregular pulses, before certain medications, or per order. An apical-radial deficit (apical minus radial) signals weak beats not reaching the wrist and must be reported.

Respirations are special: count them right after the pulse, while still holding the wrist, without telling the resident. If a person knows they are being watched, they unconsciously change their breathing. One respiration = one inhale plus one exhale. Watch the chest rise; count for a full minute if breathing is abnormal. Report dyspnea (difficult breathing), noisy or gurgling breaths, or apnea (absence of breathing).

Blood Pressure Technique

Blood pressure is the force of blood against artery walls, written as systolic over diastolic (e.g., 118/76 mmHg). Systolic is the top number (heart contracting); diastolic is the bottom (heart resting).

Manual BP steps and traps:

• Resident seated, back supported, arm at heart level, feet flat — not legs crossed.
• Cuff snug over the brachial artery, lower edge about 1 inch above the elbow crease; bladder over the inner arm.
• Use the correct cuff size — a cuff that is too small reads falsely high, too large reads falsely low.
• Do not take BP on an arm with an IV, dialysis access (AV fistula/shunt), mastectomy side, or injury.

Classification you should recognize: a reading like 158/92 mmHg is hypertension (Stage 2) and is reported; below 90/60 with dizziness suggests hypotension. Orthostatic (postural) hypotension is checked by measuring BP and pulse lying, then sitting, then standing, watching for a drop and dizziness on position change.

Temperature Conversion and Oxygen

Know the conversion formulas:

• °F to °C: (°F − 32) × 5/9
• °C to °F: (°C × 9/5) + 32

Worked example: A resident's temperature reads 38.8°C. (38.8 × 9/5) + 32 = 69.84 + 32 = 101.8°F — a fever to report to the nurse.

Pulse oximetry (SpO2) measures the percent of hemoglobin carrying oxygen, using a finger clip. Normal is 95–100%. An 88% reading in a resident with no chronic lung disease is low and reported immediately. Remove nail polish, warm cold hands, and make sure the resident is not moving for an accurate reading.

Pain, Weight, and Height

Pain is often called the fifth vital sign. The CNA does not treat pain but observes, asks, and reports it. Believe the resident's report — pain is whatever the resident says it is. Use a 0–10 scale (0 = no pain, 10 = worst imaginable) for residents who can answer; for residents who cannot speak (advanced dementia), watch nonverbal cues: grimacing, guarding, moaning, restlessness, or refusing to move. Report new or worsening pain to the nurse promptly with the location and what makes it better or worse.

Weight is measured at the same time of day, on the same scale, in similar clothing, after the resident voids, to make day-to-day comparisons meaningful. A rapid weight gain (such as 8 pounds overnight) often signals fluid retention from heart or kidney problems and is reported, not dismissed as an error. Height is recorded on admission and tracked for nutrition and body-mass calculations the nurse uses.

Sources of Error and Reporting

Common technique errors that produce wrong readings:

• Wrong cuff size, arm not at heart level, or the resident talking during a BP.
• Using the thumb to count a pulse, or counting too short a time on an irregular pulse.
• Cold fingers, motion, or nail polish lowering an SpO2 reading.
• Taking an oral temperature within 15–20 minutes of hot/cold drinks or smoking.

Finally, recording and reporting rules: record objective numbers exactly, with the route/site and time — never estimate or 'pre-chart' a value before measuring it. CNAs measure and report; they do not interpret, diagnose, or adjust care. When a value is outside the normal range or far from the resident's baseline, tell the nurse right away.