Observation:SpGrav:Pt:CSF:Qn:Refractometry
observation:spgrav:pt:csf:qn:refractometry
Observation:SpGrav:To identify measures at a point in time:Cerebral spinal fluid:Quantitative:Refractometry
observation:spgrav:to identify measures at a point in time:cerebral spinal fluid:quantitative:refractometry