plasma-lyte plasma-lyte plasma-lyte is a crystalloid solution for intravenous infusion, with varying electrolyte formulation depending on market. generally the solution has a composition that mimics human physiological plasma electrolyte concentrations, osmolality and ph. it is available as a generic medication. plasma-lyte 148 (ph7.4) plasma-lyte 148 is a market-specific solution available in the united kingdom and australia, among others and has the following composition: sodium 140 mmol/l potassium 5 mmol/l magnesium 1.5 mmol/l chloride 98 mmol/l acetate 27 mmol/l gluconate 23 mmol/l this solution is manufactured and marketed by baxter international inc.