Vital Signs, Pain, Intake, Output, and Weight

Data collection within CNA scope

Vital signs and measurements are part of data collection, not independent diagnosis. A CNA may measure temperature, pulse, respirations, blood pressure, oxygen saturation, pain level, intake, output, and weight when trained and delegated. The nurse interprets the data and decides the response. On the Kansas CNA exam, an answer is unsafe if it asks the aide to ignore an abnormal value, change an oxygen flow setting, decide a resident is stable without reporting, or state a medical cause as fact.

Accuracy starts with preparation. Identify the resident, explain the measurement, provide privacy, use correct equipment, and follow facility policy. Compare each result to the resident's usual baseline; a reading that is normal for one resident may be unusual for another. If a result seems inconsistent, repeat it when appropriate and report the concern rather than guessing.

Normal adult ranges to memorize

The exam expects firm recall of the normal adult ranges below. Memorize both the numbers and the abnormal findings that trigger a report.

Temperature routes and counting respirations

Temperature reads differently by route. A rectal temperature runs about 1 degree Fahrenheit higher than oral and is the most accurate; an axillary (armpit) temperature runs about 1 degree lower than oral and is the least accurate; tympanic (ear) reads slightly higher than oral. So an oral 98.6 F corresponds roughly to a rectal 99.6 F and an axillary 97.6 F. Always chart the route used. Never take a rectal or oral temperature when it is contraindicated by the resident's condition.

Respirations need a quiet trick: if residents know their breathing is being counted, they may change the pattern. Count one full minute while appearing to still hold the wrist for the pulse, so the count stays natural. Report noisy breathing, wheezing, bluish (cyanotic) lips or nailbeds, shortness of breath, or use of neck and shoulder (accessory) muscles. Count an irregular pulse for a full minute as well.

Reporting abnormal values

Facilities set specific reporting parameters, and residents may have individualized limits. Report fever, a very low temperature, an irregular or very fast or slow pulse, labored breathing, oxygen saturation outside the ordered range, a blood pressure far from baseline, dizziness, fainting, chest pain, sudden weakness, or new confusion. Never withhold a report because the resident says they do not want to bother the nurse, and never adjust an oxygen flow rate, which is outside CNA scope.

Equipment and technique pitfalls

Small technique errors produce false readings the exam loves to test. Use the correct blood-pressure cuff size: a cuff too small reads falsely high, and one too large reads falsely low; the arm should rest at heart level. Do not take a blood pressure on an arm with an IV, a dialysis shunt, a cast, or on the side of a mastectomy. For oxygen saturation, cold fingers, dark nail polish, or poor circulation give a false low reading, so warm the hand or try another site. When the radial pulse is irregular or hard to feel, take an apical pulse at the heart with a stethoscope for a full minute.

Pain is subjective

Pain is not proven or disproven by how the resident looks. The CNA asks about pain using the facility's 0-to-10 scale (or a faces scale for residents who cannot use numbers), records the resident's words or number and the location, observes nonverbal cues such as grimacing, guarding, restlessness, sweating, or moaning, and reports new, severe, or worsening pain. Do not promise medication, give medication, or massage a painful area without direction.

If pain occurs with chest pressure, shortness of breath, a fall, a suspected fracture, a sudden severe headache, or a rigid abdomen, get the nurse immediately, because these may signal a heart attack, stroke, or internal injury.

Intake, output, and weight

Intake and output (I&O) must be measured carefully, because small errors can hide dehydration, fluid overload, urinary problems, or bleeding. Intake includes oral fluids, ice chips (recorded as half their volume per policy), tube feedings, and other ordered fluids. Output includes urine, emesis, liquid stool, and wound drainage measured under policy. Record in milliliters, not vague words like "good" or "normal." Convert ounces to milliliters using about 30 mL per ounce.

Weigh the resident with the same scale, similar clothing, and the same time of day (usually before breakfast, after voiding) for valid trends. A sudden gain of several pounds in a short period can signal fluid retention; a sudden loss can signal dehydration or poor intake. The CNA reports the change and never diagnoses heart failure, kidney disease, or malnutrition.

Exam traps

Reject choices that estimate output without measuring, chart values before taking them, count respirations after telling the resident to breathe normally, dismiss pain because the resident is smiling, adjust oxygen, or fail to report abnormal findings. The safest answer is usually: measure correctly, document accurately in proper units, compare with baseline, and report changes promptly.