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Table 1 Ion concentrations and pH in choroid plexus, CSF and plasma of adult rats

From: Fluid and ion transfer across the blood–brain and blood–cerebrospinal fluid barriers; a comparative account of mechanisms and roles

  Ion concentrations (mmol per litre of H2O)
LV 4th V CSF Plasma
Na+ 49–53
46*
55–58
56*
152–156 148–155
K+ 95–97 87–89 2.99–3 3.9–4.6
Cl 62–64
67*
63–64
67*
126–129 113–114
HCO3 (11) (11) 22–24 21
pH 7.06 7.04 7.33 7.44
  1. LV lateral ventricle; 4th V 4th ventricle
  2. Data from [171] except values marked * from [170]. Values of [HCO3 ] in parentheses were calculated from pH and pCO2