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Difference in osmolality between serum and CSF.
The osmolality (mOsm/kg) was significantly higher in CSF than in serum (P < 0.0001; n = 179, paired t-test). Almost all of the subjects showed positive values for Δ-osmolality. CSF: Cerebrospinal fluid; Δ-Osm: difference in osmolality between serum and CSF.
