Which of the following is a calculated value in a CBC?

In a complete blood count (CBC), the RDW, or red cell distribution width, is indeed a calculated value. It reflects the variability in the size of red blood cells (erythrocytes) and is derived from the mean corpuscular volume (MCV) and the red blood cell count. The RDW is useful for differentiating between various types of anemias and can help provide insight into underlying health conditions.

Hemoglobin is a direct measurement of the amount of hemoglobin in the blood, while the RBC count measures the actual number of red blood cells present. The MCV measures the average volume of individual red blood cells and is based on the total volume of red blood cells and the count of those cells.

In summary, while RDW is a calculated value that offers important information about blood cell size variation, hemoglobin, the RBC count, and MCV are directly measured during the CBC.