What is the normal RBC to platelet ratio?

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Multiple Choice

What is the normal RBC to platelet ratio?

In a healthy person, red blood cells are far more numerous than platelets. Using typical counts—about 4.5–6.0 million red cells per microliter and about 150,000–450,000 platelets per microliter—the ratio rounds to roughly 15:1 (for example, 5,000,000 red cells divided by ~300,000 platelets ≈ 16–17:1, which sits around 15:1). The other options would require platelet counts outside the normal range (for instance, 5:1 would imply about 1,000,000 platelets per microliter, which is not normal; 50:1 or 100:1 would imply platelets far below the normal range), making them less representative of normal physiology. So the typical, exam-consistent normal RBC to platelet ratio is about 15:1.

In a healthy person, red blood cells are far more numerous than platelets. Using typical counts—about 4.5–6.0 million red cells per microliter and about 150,000–450,000 platelets per microliter—the ratio rounds to roughly 15:1 (for example, 5,000,000 red cells divided by ~300,000 platelets ≈ 16–17:1, which sits around 15:1). The other options would require platelet counts outside the normal range (for instance, 5:1 would imply about 1,000,000 platelets per microliter, which is not normal; 50:1 or 100:1 would imply platelets far below the normal range), making them less representative of normal physiology. So the typical, exam-consistent normal RBC to platelet ratio is about 15:1.

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