The erythrocyte sedimentation rate (ESR) correlates directly with residual HES and may be used to estimate the circulating levels in donors with initial ESR below 5 mm/hr as follows:


serum HES level =

= (1.797 + (0.396 * (postinfusion ESR))) mg/mL


The optimal level for component preparation is about 7.0 mg/mL.


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