Observation:SpGrav:Pt:Periton fld:Qn:Refractometry
observation:spgrav:pt:periton fld:qn:refractometry
Observation:SpGrav:To identify measures at a point in time:Peritoneal fluid /ascites:Quantitative:Refractometry
observation:spgrav:to identify measures at a point in time:peritoneal fluid /ascites:quantitative:refractometry