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Table 2 Electrolyte composition of the main balanced solutions available for intravenous administration.

From: Intravenous fluid therapy in the perioperative and critical care setting: Executive summary of the International Fluid Academy (IFA)

  Crystalloids Gelatins Starches
Lactated Ringer’s Acetated Ringer’s Hartmann’s PlasmaLyte Sterofundin ISOa ELO-MEL isoton Isoplex Gelaspan Hextend Tetraspan
Na+ [mEq/L] 130 132 131 140 145 140 145 151 143 140
K+ [mEq/L] 4 4 5 5 4 5 4 4 3 4
Ca2+ [mEq/L] 3 3 4 5 5 2 5 5
Mg2+ [mEq/L] 3 3 2 3 1.8 2 0.9 2
Cl [mEq/L] 109 110 111 98 127 108 105 103 124 118
Lactate [mEq/L] 28 29 25 28
Acetate [mEq/L] 29 27 24 45 24 24
Malate [mEq/L] 5 5
Gluconate [mEq/L] 23
Dextrose [g L-1]
Gelatin [g/L] 40 40
HES [g/L] 60 60
Dextran [g/L]
In-vivo SID [mEq/L] 28 29 29 50 29 45 45.8 56 28 29b
Osmolarity [mOsm/L] 278 277 279 294 309 302 284 284 307 297
  1. In-vivo SID—all organic molecules contained in balanced solutions are strong anions. The resulting calculated SID (in vitro-SID) is equal to 0 mEq/L, due to electrical neutrality. Once infused, the organic molecules are metabolized to CO2 and water; the resulting in vivo-SID corresponds to the amount of organic anions metabolized
  2. aSterofundin-ISO or Ringerfundin
  3. bIn vivo-SID of Tetraspan reported in the Table results from the sum of organic anions; of note, there is a discrepancy as compared to the SID calculated as the difference between inorganic cations and inorganic anions (29 mEq/L vs. 33 mEq/L). No clear explanation has been reported from the seller