Lu notes that 20 % of cases of congenital heart disease are not detected in preschool children, and are only found during health check ups when the children start school.
呂鴻基以先天性心臟病為例指出，有兩成的先天性心臟病童在學齡前未被檢查出來，直到入學後兒童健康檢查才發現，這時病童可能已經發生生長遲緩、運動耐力差、心肌擴大等問題。