How often do you monitor the eosinophil count after initiating anti-IL5 therapy for HES?

After initiating anti-IL5 therapy, I monitor the peripheral blood eosinophil count on a monthly basis until the peripheral blood eosinophil count decreases to less than 1,500. After the peripheral blood eosinophil count decreases to less than 1,500, I then monitor every 3 months for the first year a...