Observation:SpGrav:Pt:Synv fld:Qn:Refractometry
observation:spgrav:pt:synv fld:qn:refractometry
Observation:SpGrav:To identify measures at a point in time:Synovial fluid (Joint fluid):Quantitative:Refractometry
observation:spgrav:to identify measures at a point in time:synovial fluid (joint fluid):quantitative:refractometry