**Question:** What is the scale of measurement used in the case of classifying a person as 'hypeensive', 'normotensive', or 'hypotensive'?

**Core Concept:** Blood pressure classification is based on the measurement of systolic and diastolic blood pressure values. A normal blood pressure is considered within a certain range, which is crucial for determining the health status of an individual.

**Why the Correct Answer is Right:** The scale used for blood pressure classification is based on the definitions of systolic and diastolic blood pressure values. The classification ranges are as follows:

1. Hypeensive (Hypertensive): Systolic BP ≥ 180 mmHg or Diastolic BP ≥ 120 mmHg
2. Normotensive (Normal): Systolic BP between 90-120 mmHg and Diastolic BP between 60-90 mmHg
3. Hypotensive (Hypotensive): Systolic BP < 90 mmHg or Diastolic BP < 60 mmHg **Why Each Wrong Option is Incorrect:** A. 90-109 mmHg for systolic or 60-89 mmHg for diastolic: These values are within the normotensive range (90-120 systolic and 60-90 diastolic) and not considered as either hypotensive or hypertensive. B. 110-139 mmHg for systolic or 70-89 mmHg for diastolic: These values are within the hypertensive range (140 systolic and 100 diastolic) and not considered as normotensive. C. Over 140 mmHg for systolic or over 100 mmHg for diastolic: These values indicate a hypertensive state and are not considered normotensive. D. Below 90 mmHg for systolic or below 60 mmHg for diastolic: These values are within the hypotensive range and not considered normotensive. **Clinical Pearl:** Blood pressure classification is essential for identifying individuals at risk of cardiovascular diseases and initiating appropriate management strategies. A comprehensive blood pressure assessment should include both systolic and diastolic readings to accurately determine the hypertension or hypotension status. **Correct Answer:** D. Below 90 mmHg for systolic or below 60 mmHg for diastolic: These values are within the hypotensive range and not considered normotensive. Blood pressure is classified based on the measurement of systolic and diastolic blood pressure values. A normal or normotensive range is defined as systolic BP being between 90-119 mmHg and diastolic BP being 60-89 mmHg. Any value outside this range is considered abnormal and further assessment is required. It is essential to consider both systolic and diastolic readings when determining the hypertension or hypotension status. **Clinical Pearls:** 1. Systolic blood pressure values below 90 mmHg indicate hypotension, which can lead to inadequate perfusion of