Which erythrocyte index provides an indication of the average size of a red blood cell?

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Study for the VTNE Laboratory Procedures Test. Use flashcards and multiple choice questions, each question offers hints and explanations, enabling increased understanding and retention. Prepare effectively for your exam!

Multiple Choice

Which erythrocyte index provides an indication of the average size of a red blood cell?

Explanation:
The main idea being tested is how we assess the size of red blood cells. The mean corpuscular volume, or MCV, is the index that expresses the average volume (size) of an individual erythrocyte, usually given in femtoliters. When red blood cells are larger than normal, the MCV rises (macrocytosis); when they are smaller, the MCV falls (microcytosis). This makes MCV the best single indicator of the average RBC size. Other indices describe different properties. MCHC measures how much hemoglobin is packed into each cell, reflecting color or concentration of hemoglobin, not the cell’s size. MCH indicates the amount of hemoglobin per cell, again focusing on content rather than size. The M/E ratio is a bone marrow assessment comparing precursor cell types, not a measure of red cell size. The reticulocyte count shows how many immature red cells are circulating, informing on bone marrow activity rather than average cell size. So, MCV directly provides information about the average size of red blood cells, making it the correct choice.

The main idea being tested is how we assess the size of red blood cells. The mean corpuscular volume, or MCV, is the index that expresses the average volume (size) of an individual erythrocyte, usually given in femtoliters. When red blood cells are larger than normal, the MCV rises (macrocytosis); when they are smaller, the MCV falls (microcytosis). This makes MCV the best single indicator of the average RBC size.

Other indices describe different properties. MCHC measures how much hemoglobin is packed into each cell, reflecting color or concentration of hemoglobin, not the cell’s size. MCH indicates the amount of hemoglobin per cell, again focusing on content rather than size. The M/E ratio is a bone marrow assessment comparing precursor cell types, not a measure of red cell size. The reticulocyte count shows how many immature red cells are circulating, informing on bone marrow activity rather than average cell size.

So, MCV directly provides information about the average size of red blood cells, making it the correct choice.

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