Neutrophils are type of white blood cells that forms the immune system to fight against the infection. The measure of the number of the neutrophils (segmented neutrophils % + bands %) is the absolute neutrophil count (ANC). The normal range of the ANC is 1.5 to 8.0 (i.e.,) 1500 - 8000 cells/mm^3. The safe ANC is from 500 - 1500 whereas, low ANC is below 500.
Consider if your WBC count is 5.1, neutrophil % is 43 and band % is 5%.
Substituting the above values in the formula (5.1 * (43+5) )/100
The ANC is 2.448. It is of the normal range.