D little o super little a Ag:PrThr:Pt:RBC^BPU:Ord
d little o super little a ag:prthr:pt:rbc^bpu:ord
Do^a Antigen:Presence or Threshold:To identify measures at a point in time:Erythrocytes^BPU:Ordinal
do^a antigen:presence or threshold:to identify measures at a point in time:erythrocytes^bpu:ordinal