Blood Pressure, Height, Weight, and Recording

Blood Pressure, Height, Weight, and Recording

Accurate numbers drive nursing and medical decisions. In Domain IV of the Delaware Prometric outline—Basic Nursing Care Provided by the Nurse Aide (~26% of the written exam)—you must understand blood pressure concepts, measure height and weight so trends are real, and document results so the licensed nurse can act. A fabricated weight or a BP taken on the wrong arm is not a small paperwork mistake; it can hide heart failure, dehydration, or vascular risk.

Blood Pressure Concepts

Blood pressure (BP) is the force of blood against the walls of the arteries. It is recorded as two numbers in millimeters of mercury (mmHg):

• Systolic (top number) — pressure when the heart contracts and pushes blood out
• Diastolic (bottom number) — pressure when the heart relaxes between beats

Example: 120/80 mmHg means systolic 120 and diastolic 80. Many teaching materials still present roughly 120/80 as a classic adult ideal and flag readings that are much higher or lower than the resident’s usual baseline. Facility and provider thresholds for “report immediately” may be individualized on the care plan—always follow those. Hypertension (high BP) and hypotension (low BP) are nursing/medical interpretations; the CNA reports numbers and associated signs (dizziness, headache, chest pain, confusion) without diagnosing.

When the Delaware CNA Measures BP

Not every facility assigns manual BP to every aide on every shift. Measure BP when:

• You are trained and competency-checked on the equipment used (manual sphygmomanometer/stethoscope or validated automatic device per policy)
• The care plan or nurse assigns the measurement
• Facility policy includes CNAs in routine or PRN BP collection

If BP is outside your assignment or training, obtain the measurement from the person authorized to take it and still report symptoms that suggest circulatory change. Never invent a BP to “complete the flow sheet.”

Site selection and contraindications

Prefer a bare upper arm at heart level, resident seated or lying as ordered, legs uncrossed, rested for a few minutes when possible. Do not routinely use an arm that has:

• An IV or infusion running
• A dialysis access (AV fistula or graft)—protect that arm as a permanent restriction unless a physician/nurse gives a rare alternate order
• A cast, trauma, burn, or surgical site that would be harmed by cuff pressure
• Side restrictions after mastectomy or lymph-node surgery when the care plan forbids that arm

If both arms are restricted, ask the nurse which alternate site or method to use. Apply the cuff snugly on bare skin—not over thick clothing. The bladder of the cuff should cover the correct portion of the arm; a cuff that is too small can read falsely high, and one that is too large can read falsely low. Support the arm; talking and recent exercise can raise readings.

Manual vs automatic devices

Automatic cuffs are common in long-term care. Still:

• Position the resident correctly and use the right cuff size
• Keep the resident still and quiet during the cycle
• If the machine errors repeatedly or the number is inconsistent with how the resident looks, report and request a recheck per policy (manual verification by trained staff)
• Clean cuffs between residents when required; follow infection-control rules

Report very high or very low readings promptly, especially with symptoms. Do not recheck endlessly while the resident remains symptomatic without calling the nurse.

Height and Weight Accuracy

Weight trends matter as much as a single number. A gain of several pounds in a day or two can signal fluid retention (for example heart or kidney problems). Steady loss may signal poor nutrition, depression, cancer, swallowing difficulty, or uncontrolled disease. The CNA’s duty is to make each measurement comparable to the last one.

Never force a fall-risk resident to stand unsupported on a scale “because the form wants a standing weight.” Use the equipment the care plan and safety rules allow. Measure height with the resident standing straight against a measuring device when able, or use the facility-approved method for bedbound residents (for example tape measure with proper alignment). Never estimate height or weight from “how they look.”

Report sudden large gains or losses, inability to obtain a weight when ordered, or resident refusal after encouragement—the nurse may need alternate strategies or medical follow-up.

Documentation on Facility Forms

Delaware facilities use electronic records, paper flow sheets, or hybrid systems. Regardless of format, documentation standards for CNAs include:

1. Record what you measured — exact numbers with units (for example lb or kg as the facility uses; °F; beats per minute; mmHg).
2. Record when — date and time matter for trends and for PRN rechecks.
3. Record method or site when required — oral vs axillary temperature; which arm for BP; chair scale vs standing.
4. Be objective — “BP 168/94, resident states headache 6/10” is better than “BP high because resident is noncompliant.”
5. Document promptly — memory fails; delayed charting invites error.
6. Correct errors per policy — single line through paper errors with initials/date, or electronic amendment process; never erase, white-out, or overwrite to hide a mistake.
7. Never pre-chart future vitals or weights you plan to do later.
8. Never copy a roommate’s numbers or “borrow” yesterday’s weight to fill a blank.

If the resident refuses a measurement, document the refusal and notify the nurse—do not invent compliance.

Skills Exam Measurement Integrity

On the Delaware clinical skills exam, assigned skills commonly include radial pulse, respirations, and measuring urinary output (pouring into a graduate and reading at eye level). Blood pressure and weight may or may not be assigned on a given test day, but the integrity standard is the same:

• Perform the skill with correct technique
• Obtain a real measurement
• Record within the evaluator’s accuracy window
• Do not round inventively or guess

Urine measurement practice reinforces Domain IV habits: flat surface, eye-level reading, gloves, no contamination of the spout, and accurate charting in mL. Those same habits apply when you empty a drainage bag on the unit or record intake.

Linking Measurements to Reporting

Measurement without communication is incomplete care. After abnormal BP, unexpected weight change, or inability to obtain a needed vital:

• Notify the licensed nurse with the number, time, symptoms, and what you already did (for example resident seated, rechecked once)
• Stay with a symptomatic resident when safe and appropriate
• Continue assigned observations (color, breathing, alertness)
• Document after reporting as policy requires

Do not call a family member with a medical interpretation before the nurse knows. Do not post numbers on social media. HIPAA and professional boundaries apply to vital signs as much as to diagnoses.

Worked Scenario

Mr. Harris has an AV fistula in the left arm for dialysis. The electronic BP cuff is sitting on his left bedside table from night shift. Correct action: use the right arm (or the site nursing designates), explain why the left arm is protected, obtain the reading with correct cuff size, and record arm used if the form requires it. Taking BP on the fistula arm to “match last night’s chart” is a serious error.

Exam Focus

Domain IV items on BP, height, weight, and recording reward aides who know systolic vs diastolic, arm restrictions, comparable serial weights, and honest, timely documentation. When options conflict, choose accuracy, protected sites, nurse notification, and never estimating or falsifying numbers.