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What is the ratio of a sample of red blood cells in dilute blood?

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What is the ratio of a sample of red blood cells in dilute blood?

(a) 500:1

(b) 50000:1

(c) 1:500

(d) 1:50000

I had been asked this question in unit test.

My doubt is from Intravascular Oximeters topic in chapter Oximeters of Biomedical Instrumentation

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The correct option is (d) 1:50000

Easiest explanation: The method is based on collecting scattered light from the blood cells and converting them into electrical pulses for counting. A sample of dilute blood (1:500 for white cells and 1:50,000 for red cells) is taken in a glass container. It is drawn through a counting chamber in which the blood stream is reduced in cross-section by a concentric high velocity liquid sheath.

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