G Ab:PrThr:Pt:Ser/Plas^BPU:Ord
g ab:prthr:pt:ser/plas^bpu:ord
G Antibody:Presence or Threshold:To identify measures at a point in time:Serum/Plasma^BPU:Ordinal
g antibody:presence or threshold:to identify measures at a point in time:serum/plasma^bpu:ordinal