Observation:SpGrav:Pt:Pericard fld:Qn:Refractometry
observation:spgrav:pt:pericard fld:qn:refractometry
Observation:SpGrav:To identify measures at a point in time:Pericardial fluid:Quantitative:Refractometry
observation:spgrav:to identify measures at a point in time:pericardial fluid:quantitative:refractometry