What is the normal Hb level in an adult?

Appeared in: AIIMS Delhi NO - 2018

Explanation

The normal hemoglobin (Hb) level for an adult female is 12–16 g/dL, and for an adult male, it is 14–18 g/dL.
The option 12-15 gm% is the most appropriate answer as it encompasses the normal range for adult females and the lower limit for adult males.
The unit 'gm%' is equivalent to g/dL (grams per deciliter), which is the standard unit for measuring hemoglobin concentration.

Option A: This option is incorrect due to both the value and the unit. A level of 7-8 indicates severe anemia, and the unit 'mg%' is incorrect; it should be 'gm%'.
Option B: This range is above the normal hemoglobin level for most adults. Such high levels may indicate polycythemia, a condition where the body produces too many red blood cells.
Option D: This range is below the normal threshold for adults and is indicative of mild to moderate anemia.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Normal Hemoglobin (Hb) Levels in Adults as background academic context rather than a clinical decision trigger.
Nurses frequently monitor hemoglobin levels to assess a patient's oxygen-carrying capacity and to screen for, diagnose, and monitor conditions like anemia and polycythemia.
A low Hb level can cause symptoms like fatigue, shortness of breath, and pallor, requiring nursing interventions such as administering blood products, iron supplements, or oxygen therapy as ordered.
A high Hb level can increase blood viscosity, raising the risk of thrombosis. Nurses should monitor for signs of clotting, such as pain or swelling in the extremities.

How to Approach the Question

First, identify the core of the question, which asks for a specific normal laboratory value: hemoglobin (Hb) in an adult.
Recall the standard reference ranges for Hb. Remember that these values differ between males and females.
Evaluate each option against the known normal ranges. Note the units used (gm% or g/dL vs. mg%).
Eliminate options that are clearly incorrect due to wrong units (mg%) or values that fall into anemic (<12 g/dL) or polycythemic (>18 g/dL) ranges.
Select the option that best represents a general or combined normal range for adults. The range 12-15 gm% is the most inclusive and accurate choice among the given options.

Concept Tested & Keywords

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E6 Pathology-Vandana Puri & Kavita Gaur Textbook of Pathology and Genetics p. 396-398

E6 Pharmacology Nursing Lilley 11e Part 3 p. 89-91

E6 Parks TextBook of Preventive & Social Medicine part 2 — Subpart A (pp 1-232 of 464) p. 158-160

Practise the full AIIMS Delhi NO - 2018

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