What is the Normal Blood Pressure of an adult person?

Appeared in: Raj. CHO -2020

Explanation

According to the American Heart Association (AHA) guidelines, normal blood pressure for an adult is defined as a systolic pressure of less than 120 mm Hg AND a diastolic pressure of less than 80 mm Hg.
The value of 120/80 mm Hg represents the upper limit of this normal range and is the most commonly cited benchmark for a healthy blood pressure.
Among the given choices, 120/80 mm Hg is the standard reference for normal blood pressure.

Option B: A blood pressure of 130–139 systolic or 80–89 diastolic is classified as Stage 1 Hypertension, not normal.
Option C: A blood pressure of 140–159 systolic or 90–99 diastolic is classified as Stage 2 Hypertension.
Option D: While a reading of 100/70 mm Hg is considered healthy and falls within the normal range, it is not the standard reference value for 'normal blood pressure'. The question asks for 'the' normal blood pressure, implying the benchmark value.

Visual 1: Chart - A color-coded chart illustrating the different blood pressure categories (Normal, Elevated, Stage 1, Stage 2, Hypertensive Crisis) with their corresponding systolic and diastolic values. This helps in quick recall and comparison.

Clinical Relevance

Nursing practice connection: Knowing Blood pressure classification in adults helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Hypertension is often called the 'silent killer' because it typically has no symptoms until significant damage has occurred to the heart, arteries, or other organs. Regular monitoring is crucial for early detection and management.
Accurate blood pressure measurement is a fundamental nursing skill. Errors in technique (e.g., wrong cuff size, incorrect arm position) can lead to inaccurate readings and inappropriate clinical decisions.
What if? If a patient's blood pressure is consistently high in the clinic but normal at home (known as 'white coat hypertension'), the diagnosis should be confirmed with ambulatory or home blood pressure monitoring to avoid unnecessary treatment.

How to Approach the Question

First, identify the core of the question: it asks for the standard 'normal' blood pressure in an adult.
Recall the established medical guidelines for blood pressure classification (e.g., from the AHA/ACC).
Mentally review the categories: Normal, Elevated, Hypertension Stage 1, and Hypertension Stage 2.
Compare each option to these standard categories.
Eliminate options that fall into hypertensive categories (130-139/80-89 and 140-159/90-99).
Choose the option that represents the most widely accepted benchmark for normal blood pressure, which is 120/80 mm Hg, the upper limit of the normal range.

Concept Tested & Keywords

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Practise the full Raj. CHO -2020

Attempt every question from this paper in a timed mock, then review the full solution for each one.