Normal platelet count is?

Appeared in: NHM MP Staff Nurse - 2015

Explanation

The standard physiological range for platelets in a healthy adult is 150,000 to 450,000 per cubic millimeter (cu.mm), which is equivalent to 1.5 to 4.5 lakhs/cu.mm.
Platelets, or thrombocytes, are essential for hemostasis, the process of stopping bleeding, through clot formation.
This specific range represents a crucial balance: it's high enough to prevent spontaneous bleeding but low enough to avoid the risk of pathological clotting (thrombosis).

Option A: This range (50,000-150,000/cu.mm) is below the normal physiological level. A count below 1.5 lakhs/cu.mm defines thrombocytopenia, a condition characterized by an increased risk of bleeding.
Option C: The upper limit of this range (7.0 lakhs or 700,000/cu.mm) is significantly above the normal threshold of 4.5 lakhs/cu.mm and falls into the category of thrombocytosis.
Option D: This range (500,000–1,000,000/cu.mm) represents moderate to severe thrombocytosis, a condition that significantly increases the risk of pathological blood clot formation (thrombosis).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Normal laboratory values for platelet count as background academic context rather than a clinical decision trigger.
Nurses critically monitor platelet counts to assess a patient's risk for bleeding or clotting. This is vital before surgeries, during chemotherapy, or in diseases like dengue fever.
A low count (thrombocytopenia) requires the nurse to implement bleeding precautions, such as using a soft toothbrush, avoiding intramuscular injections, applying pressure to venipuncture sites, and monitoring for petechiae or bruising.
What if? A patient's platelet count is 90,000/cu.mm (0.9 lakhs). The nurse's priority action changes to implementing strict bleeding precautions and notifying the physician, as the patient is at significant risk for spontaneous bleeding. Elective invasive procedures would likely be postponed.

How to Approach the Question

This is a factual recall question asking for a standard laboratory value.
First, identify the specific parameter being asked: 'Normal platelet count'.
Recall the physiological range for platelets, which is in the order of lakhs (hundreds of thousands) per cubic millimeter.
Evaluate the given options. Option A is too low (thrombocytopenia). Options C and D are too high (thrombocytosis).
Select the option that aligns with the standard accepted range of 1.5 to 4.5 lakhs/cu.mm.

Concept Tested & Keywords

QoHxyl-Rf3vVGDQSsrcdj6

E6 Pathology-Vandana Puri & Kavita Gaur Textbook of Pathology and Genetics p. 384-386

E6 Physiology Essentials Sembulingam 10e Part 1 p. 131-133

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