Ringer's solution, like LR, contains sodium, potassium, calcium, and chloride in similar concentrations (147 mEq/L of sodium, 4 mEq/L of potassium, 4 mEq/L of calcium, and 156 mEq/L of chloride). But it doesn't contain lactate. Ringer's solution is used in a similar fashion as LR, but doesn't have the contraindications related to lactate. However, because it's not an alkalizing agent, it may not be indicated for patients with metabolic acidosis