5.3 Data Collection, Observation & Reporting

Objective vs. Subjective Data

The CNA's job is to observe, measure, and report — the nurse turns that information into clinical decisions. Data Collection is 4 of the 70 knowledge questions, and the distinction between two kinds of data is heavily tested.

• Objective data (signs): things you can measure or directly observe. Examples: a temperature of 101.4°F, a 4-pound weight gain, a reddened heel, vomiting, a swollen ankle, a respiratory rate of 24.
• Subjective data (symptoms): things only the resident can feel and report. Examples: 'My chest hurts,' 'I feel dizzy,' 'I'm nauseous.'

Quick Answer: Objective = measured or observed by you. Subjective = the resident says it. Chart subjective data in the resident's own words inside quotation marks, and never add your opinion or interpretation.

The exam will also separate a CNA's role from the nurse's: a CNA observes and collects data; the nurse performs the assessment. Saying a wound 'looks infected' is interpretation (assessment) — instead report exactly what you see: redness, warmth, drainage, odor.

Good observation uses all your senses. Sight: skin color, swelling, a rash, an unsteady gait. Touch: warm or cool skin, a fast or weak pulse. Hearing: wheezing, a moan, a complaint. Smell: fruity breath (possible high blood sugar), a foul wound odor, the smell of urine signaling incontinence. Report what you sense factually and let the nurse interpret it — that division of labor is exactly what the Data Collection questions test.

Measuring and Recording Vitals

Vital signs include temperature, pulse, respirations, blood pressure, and often pain and oxygen saturation. Measure exactly as trained and report any reading outside the normal range to the nurse.

Minnesota measurement accuracy (skills test tolerances): when you count and record a resident's vitals, the RN Test Observer compares your number to theirs. Your radial pulse must be within 4 beats, and your respirations within 2 breaths, of the observer's count. Count each for a full minute and tell the observer when you start and stop. Notable distractors: count respirations without telling the resident (awareness changes the rate), and locate the radial pulse on the thumb side of the wrist using your fingertips, not your thumb.

Intake & Output and Recognizing Changes

Intake and Output (I&O) tracks all fluids in (drinks, IV, tube feeding) and out (urine, emesis, drainage), measured in milliliters (mL). Memorize the conversion 1 ounce = 30 mL, so an 8-ounce cup = 240 mL and a 4-ounce juice = 120 mL. On the Minnesota skills test, when you measure urine output your recorded amount must be within 25 mL of the observer's reading, measured with the graduate at eye level on a flat surface. Report a major imbalance — especially little or no urine output — to the nurse.

A change in condition is anything different from the resident's baseline, and the CNA usually notices it first. Report these immediately:

• Chest pain, trouble breathing, or bluish (cyanotic) lips/nails
• A fall, injury, or new bruise
• Bleeding, or vomit that looks like coffee grounds
• Sudden confusion, slurred speech, facial droop, or one-sided weakness (possible stroke)
• New skin breakdown, fever, or a sharp change in behavior, appetite, or alertness

Use SBAR to give a clear report: Situation, Background, Assessment/observation (you observe; the nurse assesses), Recommendation/request. Urgent items are reported verbally and immediately; written documentation follows.

Know the difference between reporting and recording. Reporting is the spoken hand-off to the nurse — immediate for anything urgent, and at the end of shift for routine items. Recording (charting) is the written legal entry. Some changes need both: you verbally tell the nurse about a fall right away, then document the facts. A handy rule for what to report now versus later: anything affecting airway, breathing, circulation, bleeding, level of consciousness, or safety is reported immediately.

Documentation Rules

Documentation is a legal record, and Minnesota expects you to chart correctly:

• Be factual and objective — record what you saw, did, or measured, not opinions.
• Chart only after care is given. Never document ahead of time.
• Be timely: record promptly so values are accurate; include the date and time.
• Write legibly in ink; never erase, scribble out, or use white-out.
• Correct an error by drawing a single line through it, writing the correction, and adding your initials and the date.
• Use only approved abbreviations and chart only your own care — never document for a coworker.
• Protect privacy: records are confidential under HIPAA (Health Insurance Portability and Accountability Act).

Trap: A CNA who pre-charts an 8 a.m. bath at 7:45 a.m. has falsified the record even if she intends to do it — charting ahead is never allowed. Likewise, white-out or erasing destroys the legal trail; the single-line correction keeps the original entry readable, which is what graders and surveyors expect.