What is the formula used to calculate the Absolute Neutrophil Count (ANC)?

The formula used to calculate the Absolute Neutrophil Count (ANC) is based on determining the number of neutrophils in the blood and their percentage relative to the total white blood cell (WBC) count. The correct formula takes the percentage of neutrophils and bands (immature forms of neutrophils) from a differential count, adds them together, and then multiplies by the total WBC count divided by 100. This gives the absolute number of neutrophils per microliter of blood, which is essential for assessing a patient's immune status, especially in those undergoing chemotherapy where the risk of infection is heightened.

Understanding this formula is crucial in clinical practice, as it helps healthcare providers monitor patients for neutropenia, which can lead to serious complications such as infections. The other options presented do not accurately reflect the proper calculation of ANC, either misunderstanding the components needed or misapplying them in the formula. For an accurate assessment of neutrophil levels, it is essential to use the correct approach as outlined in the appropriate formula for ANC calculation.