Questions
2 questions per paper
Difficulty
Easy
Importance
High yield for B.Sc Nursing and MBBS University exams
Overview
Vital signs are the primary physiological indicators used to assess the core functions of the human body. Mastering these values and their clinical significance is essential for both theory exams and clinical viva voce assessments in medical and nursing curricula.
Body Temperature
Body temperature reflects the balance between heat production and heat loss by the body, controlled primarily by the hypothalamus. It is a critical indicator of metabolic state, infection, or environmental stress.
- Normal range: 36.5°C to 37.5°C (97.7°F to 99.5°F)
- Pyrexia (Fever): Temperature above 38°C (100.4°F)
- Hypothermia: Temperature below 35°C (95°F)
- Formula: °F = (°C × 9/5) + 32
- Sites of measurement: Oral, Axillary, Rectal, Tympanic
Pulse Rate
The pulse is the rhythmic expansion of an artery resulting from the contraction of the left ventricle of the heart. Assessment includes rate, rhythm, and volume to detect cardiovascular abnormalities.
- Normal adult resting range: 60–100 beats per minute
- Tachycardia: >100 beats per minute
- Bradycardia: <60 beats per minute
- Common sites: Radial, Carotid, Brachial, Apical
- Assessment criteria: Rate, Rhythm, Strength (Amplitude)
Respiration
Respiration involves the exchange of gases between the atmosphere and the body cells, measured by counting breaths per minute. It is vital for evaluating pulmonary function and metabolic acid-base balance.
- Normal adult rate: 12–20 breaths per minute
- Tachypnea: >20 breaths per minute
- Bradypnea: <12 breaths per minute
- Apnea: Temporary cessation of breathing
- Assessment: Rate, Depth, and Pattern
Blood Pressure Measurement
Blood pressure is the force exerted by the blood against the vessel walls during the cardiac cycle. Accurate measurement using a sphygmomanometer is a fundamental clinical skill required for diagnosing hypertension and circulatory shock.
- Normal range: <120/80 mmHg
- Hypertension (Stage 1): 130–139/80–89 mmHg
- Korotkoff sounds: The sounds heard during auscultatory BP measurement
- Pulse Pressure: Systolic minus Diastolic
- Mean Arterial Pressure (MAP) = Diastolic + 1/3(Pulse Pressure)
Exam Tip
Always state the normal reference range first when defining any vital sign, as examiners prioritize precise baseline knowledge over descriptive theory.
Common Mistakes
- Confusing the physiological definitions of tachycardia versus tachypnea
- Failing to account for the 'auscultatory gap' during blood pressure measurement
- Reporting units incorrectly, such as mixing up Fahrenheit and Celsius thresholds
More Revision Notes
Ready to test yourself?
Play topic-wise Vital Signs questions in Aspirant Arcade — gamified MCQ practice.
Download Free