ANC is typically expressed in which unit?

• A. x10^12/L
• B. x10^8/L
• C. cells per microliter
• D. x10^9/L

Answer: (D)

The key idea is that ANC is a count of neutrophils expressed per volume of blood. In clinical labs, these cell counts are usually reported in terms of how many billions of cells are present in one liter of blood, written as x10^9/L. This makes the numbers easy to compare across patients and aligns with how other white blood cell measures are reported. For reference, 1 x10^9/L corresponds to about 1,000 neutrophils per microliter, so the typical ANC range translates to roughly 1,500–8,000 neutrophils per microliter in many healthy and near-healthy individuals. The other options don’t match the standard reporting scale for neutrophil counts: x10^12/L would be the scale more typical for red blood cells, and x10^8/L is too small for neutrophil counts. Some labs do report per microliter, but the conventional unit used here is x10^9/L.