K Ag:PrThr:Pt:RBC^Fetus:Ord
k ag:prthr:pt:rbc^fetus:ord
K Antigen:Presence or Threshold:To identify measures at a point in time:Erythrocytes^Fetus:Ordinal
k antigen:presence or threshold:to identify measures at a point in time:erythrocytes^fetus:ordinal