Table 1.

CSF composition reported for human, rabbit and dog

Solute	Humana		Rabbitb		Dogb
	Plasma Conc.	CSF Conc.	Plasma Conc.	CSF Conc.	Plasma Conc.	CSF Conc.
Na+ (mM/L)	153	147	148	149	155	151
K+ (mM/L)	4.7	2.9	4.3	2.9	4.6	3.0
Ca2+ (mM/L)	1.3	1.1	5.6	2.5	5.7	2.9
Mg2+ (mM/L)	0.6	1.1	2.0	1.7	1.4	2.0
Cl− (mM/L)	110	113	106	130	121	133
HCO3− (mM/L)	24	22	25	22	26	26
pH	7.40	7.33	7.46	7.27	7.42	7.42
Osmolarity (mOsm)	290	290	298.5	305.2	299.6	305.2

^aHuman CSF values from Ransom [37]

^bRabbit and dog CSF values from Damkier et al. [38]