6.15 Measuring & Recording Vital Signs
Key Takeaways
- Obtain facility-requested vitals before or after draws using correct technique; document route for temperature and which arm for blood pressure.
- Count a regular radial pulse for 30 seconds and multiply by 2; count respirations unobtrusively so the patient does not alter breathing.
- Correct cuff size is essential—too-small cuffs falsely elevate BP and too-large cuffs falsely lower BP.
- Use adult study anchors (pulse ~60–100, respirations ~12–20, oral temp near 98.6°F) and follow facility critical-value lists for escalation.
- If vitals indicate instability, notify the nurse/provider before an invasive procedure and remain within phlebotomy scope.
6.15 Measuring & Recording Vital Signs
AMCA PTC Task 5.17 addresses measuring and recording vital signs when the facility or protocol requires them in association with specimen collection. Phlebotomy technicians are not primary diagnosticians, but many outpatient labs, mobile draws, and pre-procedure pathways ask collectors to obtain temperature, pulse, respirations, blood pressure, and sometimes a pain score before or after a draw. Accuracy, correct technique, and knowing when to escalate abnormal values are the exam focus.
When Vitals Are Requested Around a Draw
Facilities may require vitals:
- Before invasive collection if the patient reports feeling faint, has a history of syncope with needles, or the order is tied to a procedure clearance.
- After collection when the patient experienced near-syncope, prolonged bleeding, or a complication.
- Per standing protocol for certain clinics (e.g., anticoagulation clinics, infusion centers, employee health).
If vitals are not part of your assigned role or you lack validated competency, do not improvise—notify nursing or the supervising clinician. Stay inside scope: obtain and record assigned vitals; do not independently diagnose or prescribe treatment based on the numbers.
Temperature Routes
| Route | Typical Use | Key Technique Notes |
|---|---|---|
| Oral | Cooperative adults/older children | Wait after hot/cold drinks; probe under tongue; lips sealed |
| Tympanic (ear) | Rapid screening | Correct ear tug/seal; follow device instructions |
| Temporal artery | Noninvasive screening | Sweep per manufacturer path; avoid wet/diaphoretic forehead errors |
| Axillary | Less precise alternative | Dry axilla; arm adducted; generally reads lower than oral |
| Rectal | Rare for routine phlebotomy | Usually nursing/provider task; highest infection-control burden |
Document the route with the value (e.g., “98.6°F oral”). Comparing an axillary reading to an oral reference range without noting route misleads clinicians.
Adult oral temperature study anchor: about 97.8°F–99.1°F (36.5°C–37.3°C) with ~98.6°F (37°C) as the classic mean. Fever thresholds and unit (°F vs °C) follow facility policy.
Pulse (Heart Rate)
For routine adult assessment, the radial pulse at the wrist is standard.
- Place the patient at rest with the arm supported.
- Use the pads of the index and middle fingers (not the thumb—your own pulse can confuse the count).
- Count beats for 30 seconds and multiply by 2 for beats per minute when the rhythm is regular.
- If the rhythm is irregular, count a full 60 seconds and note irregularity.
Adult study anchor: resting pulse roughly 60–100 beats/minute. Bradycardia (<60) or tachycardia (>100) in a symptomatic patient (dizziness, chest pain, syncope) warrants immediate nurse/provider notification—especially before continuing an invasive stick.
Respirations
Count respirations unobtrusively. Many patients alter their breathing if they know they are being watched.
- Observe chest or abdomen rise/fall after finishing the pulse count while fingers still appear to be on the radial site.
- One rise + one fall = one respiration.
- Count 30 seconds × 2 (or full minute if irregular/labored).
- Note depth, effort, and use of accessory muscles if obvious.
Adult study anchor: about 12–20 breaths/minute at rest. Marked tachypnea, bradypnea, or distress is a stop-and-notify finding.
Blood Pressure Basics
Blood pressure (BP) requires correct cuff size more than any other single technique factor.
| Cuff Fit Concept | Rule of Thumb | Error If Wrong |
|---|---|---|
| Bladder width | ~40% of arm circumference | Wrong size → false high or low readings |
| Bladder length | ~80% of arm circumference | Incomplete compression |
| Too small cuff | Common outpatient error | Falsely elevated BP |
| Too large cuff | Loose wrap on thin arm | Falsely low BP |
Technique essentials:
- Patient seated, feet flat, arm supported at heart level; no talking during measurement when possible.
- Avoid arms with AV fistula, mastectomy/lymph node dissection side restrictions, or active IV infusion when an alternate arm is available—follow clinical orders.
- Apply cuff to bare upper arm; locate brachial pulse; inflate/deflate per device type (manual aneroid vs validated automated).
- Record systolic/diastolic (e.g., 118/76 mmHg) and which arm was used.
Adult study anchors (resting): often summarized near <120/<80 mmHg as a desirable range in health education materials, with elevated and hypertensive categories defined by current clinical guidelines used by the facility. For the PTC exam, prioritize technique, cuff size, and escalation—not memorizing every guideline subtype.
Pain Scale (When Used)
If protocol includes pain assessment, use the facility tool (commonly 0–10 numeric rating: 0 = no pain, 10 = worst imaginable). Record the number and any brief patient description (e.g., “needle site burning 3/10”). Pain reporting does not authorize independent medication decisions—communicate significant pain to nursing/provider.
Normal Adult Ranges as Study Anchors
| Vital Sign | Typical Adult Resting Anchor | Escalate When |
|---|---|---|
| Temperature | ~97.8–99.1°F oral (route-dependent) | High fever or hypothermia with symptoms |
| Pulse | ~60–100 /min | Symptomatic brady/tachycardia; irregularity with distress |
| Respirations | ~12–20 /min | Labored breathing, cyanosis, extreme rates |
| Blood pressure | Roughly <120/<80 desirable educational anchor | Severe elevation/hypotension with symptoms; instability |
| Pain | Patient-reported 0–10 | Sudden severe pain, chest pain, or neurologic symptoms |
These anchors help exam recognition; facilities publish exact critical-value call lists—follow local critical notification policy.
Abnormal Values, Scope, and Holding Procedures
If vital signs suggest the patient is unstable (severe hypotension, unmarked tachycardia with chest pain, respiratory distress, syncope, or critical fever per policy), notify the nurse or provider before proceeding with an invasive draw. Do not “get the tubes first” when the patient is crashing. Document the values, time, who was notified, and any orders to delay or cancel collection.
Stay in scope:
- Measure and record assigned vitals accurately.
- Report abnormalities promptly.
- Do not interpret complex differentials, start treatments, or ignore nursing direction.
Vital signs around phlebotomy exist to protect patients—treat them as safety data, not busywork.
When counting a regular adult radial pulse for routine documentation, which technique is correct?
A blood pressure cuff that is too small for the patient’s arm is most likely to produce which error?
A patient scheduled for venipuncture has a pulse of 142/min, is diaphoretic, and reports chest pressure. What should the phlebotomist do first?