Observation:SpGrav:Pt:Gast fld:Qn:Refractometry
observation:spgrav:pt:gast fld:qn:refractometry
Observation:SpGrav:To identify measures at a point in time:Gastric fluid/contents:Quantitative:Refractometry
observation:spgrav:to identify measures at a point in time:gastric fluid/contents:quantitative:refractometry