Introduction
Monitoring vital signs is one of the most essential tasks in healthcare. These measurements provide key information about a patient’s health status and help detect potential medical problems early. In this article, based on Sarah from RegisteredNurseRN’s demonstration, we’ll walk through each step of taking vital signs — including pain assessment, oxygen saturation, temperature, pulse, respiration, and blood pressure — with explanations and practical tips for accurate recording.
1. Preparation and Equipment
Before beginning, gather all the necessary equipment:
- Stethoscope and blood pressure cuff
- Thermometer (digital, tympanic, or temporal)
- Pulse oximeter
- Watch or timer
- Disposable gloves
- Disinfectant wipes (for reusable equipment)
Perform hand hygiene and don appropriate PPE if required, such as in isolation or contact precaution situations.
You’ll be measuring:
- Blood pressure
- Heart rate (pulse)
- Respiratory rate
- Temperature
- Oxygen saturation
- Pain level (often referred to as the fifth vital sign)
2. Pain Assessment
Begin by introducing yourself and explaining the procedure to the patient. Use patient identifiers such as their name and date of birth to confirm identity.
Pain assessment is a vital step because pain can significantly affect other vital signs, often elevating heart rate, blood pressure, and respiratory rate.
The 0–10 numerical scale is the most common tool used:
- 0 means no pain
- 10 represents the worst pain imaginable
If a patient reports pain, follow up by asking:
- Location – Where is the pain?
- Description – Is it sharp, dull, burning, or radiating?
- Duration – When did it start?
Document both the numerical rating and description of the pain accurately.
3. Measuring Oxygen Saturation (SpO₂)
Use a pulse oximeter to measure oxygen levels in the blood.
- Place the device on a warm, pink fingertip (avoid cold hands or nail polish).
- Wait for a stable reading.
Normal oxygen saturation levels are 95%–100%.
Below 95% may indicate respiratory issues requiring attention.
Clean the probe after use with a disinfectant wipe and record both the oxygen level and pulse rate displayed on the device.
4. Measuring Body Temperature
Body temperature can be taken through several routes:
- Oral (mouth)
- Temporal (forehead)
- Tympanic (ear)
- Rectal
- Axillary (underarm)
Normal temperature in adults ranges between 97°F to 99°F (36.1°C to 37.2°C), with an average of 98.6°F (37°C).
Route variations:
- Rectal/Tympanic: 1°F higher than oral readings
- Axillary/Temporal: 1°F lower than oral readings
For a temporal reading:
- Place the probe flush against the centre of the forehead.
- Press and hold the button while sliding it to the hairline.
- If the patient is sweating, scan across the forehead and then behind the ear to ensure accuracy.
Always clean the thermometer and document both the reading and route used.
5. Checking Pulse (Heart Rate)
The radial pulse is the most common site for adults.
- Locate the radial artery on the wrist, just below the thumb.
- Use your first three fingers—never your thumb, as it has its own pulse.
- Apply light pressure and count the beats for 30 seconds (multiply by 2).
- If irregular, count for a full minute.
- If irregular, count for a full minute.
Normal adult heart rate: 60–100 beats per minute (bpm)
Assess for:
- Rate – how fast or slow
- Rhythm – regular or irregular
- Strength – graded as
- 0 = Absent
- 1+ = Weak
- 2+ = Normal
- 3+ = Bounding
- 0 = Absent
6. Measuring Respiratory Rate
To avoid influencing breathing, measure respirations while pretending to check the pulse.
Observe the rise and fall of the chest—one rise and one fall equal one breath.
If needed, place a hand gently on the patient’s back to feel movement.
Normal adult respiratory rate: 12–20 breaths per minute
Assess for:
- Depth – shallow or deep
- Effort – laboured or unlaboured
- Rhythm – regular or irregular
Count for 30 seconds and multiply by 2, or one full minute if irregular.
7. Measuring Blood Pressure (BP)
Positioning:
- The patient should be seated with their arm at heart level and legs uncrossed.
- Choose the correct cuff size to ensure accuracy.
Steps:
- Locate the brachial artery inside the bend of the arm.
- Place the cuff 2 inches above the elbow crease with the arrow pointing to the artery.
- Estimate the systolic pressure: inflate the cuff while palpating the artery until the pulse disappears. Note that number.
- Deflate the cuff completely, wait 30–60 seconds, then reinflate 30 mmHg higher than the estimated number to avoid missing the auscultatory gap (a temporary silence in some hypertensive patients).
- Place the stethoscope over the brachial artery using the bell or diaphragm.
- Slowly deflate the cuff (2 mmHg per second).
- The first sound = Systolic pressure (top number)
- The last sound = Diastolic pressure (bottom number)
- The first sound = Systolic pressure (top number)
Example reading: 104/78 mmHg
Normal blood pressure (per ACC 2017):
- Normal: <120 / <80 mmHg
- Elevated: 120–129 / <80 mmHg
- Stage 1 Hypertension: 130–139 / 80–89 mmHg
- Stage 2 Hypertension: ≥140 / ≥90 mmHg
Clean the cuff after use and document the reading, arm used, and position of the patient.
8. Documentation and Final Steps
After completing all assessments:
- Record each reading clearly in the patient’s chart.
- Include units, measurement sites, and routes (e.g., “BP 104/78 mmHg, left arm, sitting”).
- Note any abnormal findings or patient-reported symptoms.
Perform hand hygiene and ensure the patient is comfortable before leaving.
Conclusion
Taking vital signs accurately is a fundamental nursing skill that provides critical information about a patient’s overall condition. Each measurement—pain, oxygen level, temperature, pulse, respiration, and blood pressure—offers insight into different body systems. Proper technique, patient communication, and attention to detail ensure accuracy and patient safety.
By mastering this process, healthcare professionals can detect early signs of deterioration, guide treatment decisions, and deliver better-quality care every time.
