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Relationship between plasma osmolality (Posm; mmol/kg) samples when using a 250 μL sample (X‐axis) and a 20 μL sample (Y‐axis) (A), 20 μL sample (X‐axis) and the calculated plasma osmolarity (mmol/L; Y‐axis) (B), and 250 μL sample (X‐axis) and the calculated plasma osmolarity (mmol/L; Y‐axis) (C). The dashed line represents the line of identity where Y = X. The solid line represents the line of best fit
