Table 2 shows other saline solutions available for specific purposes.

Fluid	% NaCl	NaCl (g/L)	Na+ (mmol/L)	Cl- (mmol/L)	Tonicity (relative to plasma)
Fifth-normal saline	0.18	1.8	31	31	1/5; hypotonic
Half-normal saline	0.45	4.5	77	77	1/2; hypotonic
Twice-normal saline	1.8	18	308	308	2; hypertonic

Table 2 Composition of other saline solutions

These fluids should not be used in adult patients for maintenence therapy.