Eight Ways to Get a Number That Is Not True

Strip 1 · Cuff size A cuff too narrow for the arm reads falsely high. A cuff too wide reads falsely low. Correct: size the bladder to the arm circumference before the first reading, and record which cuff was used.

Strip 2 · Arm position An arm below heart level or left unsupported reads falsely high. An arm above heart level reads falsely low. Correct: arm supported at heart level, back supported, feet flat, legs uncrossed, patient silent for the measurement.

Strip 3 · Deflation and the gap Releasing the valve too quickly underestimates systolic and overestimates diastolic. An auscultatory gap can hide the true systolic entirely. Correct: palpate an estimated systolic first, inflate above it, then deflate slowly.

Strip 4 · Orthostatics Standing values taken too late miss the drop. Correct: measure supine, then again within the first three minutes of standing. Report a fall of roughly twenty points systolic or ten points diastolic, or any symptoms, rather than repeating the measurement until it improves.

Strip 5 · Respirations A patient who knows they are being counted changes the rate. Correct: count without announcing it, for a full minute when the pattern is irregular, and describe depth and effort rather than the rate alone.

Strip 6 · Pulse and apical A radial pulse counted for fifteen seconds hides an irregular rhythm. Correct: apical at the fifth intercostal space, midclavicular line, for a full minute when the rhythm is irregular or before a rate-controlling drug. Take an apical-radial deficit with a second nurse.

Strip 7 · Temperature route Routes are not interchangeable, and a route change invents a trend that never happened. Oral is unreliable soon after hot or cold intake or smoking. Rectal is avoided in neutropenia, thrombocytopenia, and after rectal surgery. Correct: keep the route consistent and document which one was used.

Strip 8 · Pulse oximetry Cold extremities, motion, poor perfusion, and nail coverings degrade the signal. Carbon monoxide exposure can produce a reassuring reading during real hypoxia. Occult hypoxemia may be missed more often in patients with darker skin pigmentation, which is a limitation of the device rather than a characteristic of the patient. Correct: treat work of breathing and color as the finding, and confirm a suspect reading rather than charting it.

Pain strip · the tool follows the patient

Self-report is the standard whenever the patient can give one. Use a numeric rating or a FACES scale for the patient who can report. Use FLACC for the preverbal child, CRIES for the neonate, PAINAD for advanced dementia, and CPOT for the critically ill nonverbal adult. When self-report is impossible, work the hierarchy: search for likely causes, observe behavior, seek proxy report from someone who knows the patient, then evaluate a trial of comfort measures or analgesia and reassess.

Margin notea number is a claim about technique.

Watch outnever chart a value you do not trust. Repeat it correctly, or document that the measurement could not be obtained and why.

TakeawayCharting a value produced by bad technique is worse than having no value, because the next nurse will trust it.

Every reference value → BOOK 07 · P3. Analgesic pharmacology → BOOK 05 · P9.