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Which of the following is correct expression for RDW index?(a) [(20^th – 80^th) Percentile Volume / (20^th – 80^th) Percentile Volume] X 100 X K(b) [(20^th – 80^th) Percentile Volume / (20^th + 80^th) Percentile Volume] X 100 X K(c) [(20^th + 80^th) Percentile Volume / (20^th – 80^th) Percentile Volume] X 100 X K(d) [(20^th + 80^th) Percentile Volume / (20^th + 80^th) Percentile Volume] X 100 X KThe question was asked in my homework.My query is from Biotelemetry topic in portion Biomedical Telemetry of Biomedical Instrumentation

Answer»

Correct answer is (b) [(20^th – 80^th) PERCENTILE Volume / (20^th + 80^th) Percentile Volume] X 100 X K

The best I can explain: The total erythrocyte count is SCANNED by a continuously variable thresholding circuit. The RDW index is expressed by the following equation [(20^th – 80^th) Percentile Volume / (20^th + 80^th) Percentile Volume ] X 100 X K. It is a numerical expression of the width of the size distribution of red cells. It is DERIVED by analog computation. The upper threshold is MOVED progressively lower from a level equivalent to 360 femolitres until 20 per cent of all erythrocytes present have a size above a certain value.


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