Table 1.
Formulae available for calculated osmolality (units for all analytes are mmol/L).*
| Number | Formula |
|---|---|
| 1 | 1.75(Na) + Glu + 0.5(Urea) + 10.1 |
| 2 | 2.63(Na) − 65.4 |
| 3 | 1.86(Na) + Glu + 0.5(Urea) |
| 4 | 2(Na + K) + Glu + 0.5(Urea) |
| 5 | 1.85(Na) + 1.84(K) + 1.15(iCa) + 1.17(Mg) + Glu + 0.5(Urea) |
| 6 | 2(Na) |
| 7 | 2(Na) + Glu + 0.5(Urea) |
| 8 | 2(Na) + 7 |
| 9 | 2(Na) + 10 |
| 10 | 2(Na) + Glu |
| 11 | 2.1(Na) |
| 12 | 2(Na) + Glu + 0.93 × 0.5(Urea) |
| 13 | 0.985[2(Na + K) + Glu + 0.5(Urea)] |
| 14 | 1.86(Na) + Glu + 0.5(Urea) + 5 |
| 15 | 2(Na) + 0.9(Glu) + 0.93(Urea) × 0.5 |
| 16 | 2(Na) + 0.5(Urea) |
| 17 | [1.86(Na) + Glu + 0.5(Urea)] / 0.93 |
| 18 | 1.9(Na + K) + Glu + 0.5(Urea) |
| 19 | 1.8(Na + K + iCa) + Glu + 0.47 × 0.5(Urea) |
| 20 | 1.85(Na) + Glu + 0.5(Urea) + 8.55 |
| 21 | 1.86(Na) + Glu + 0.5(Urea) + 9 |
| 22 | 1.86(Na) + Glu + Urea + 9 |
| 23 | 2(Na + K) + Glu + 0.93 × 0.5(Urea) |
| 24 | 1.89(Na) + 1.38(K) + 1.08(Glu) + 1.03(Urea) + 7.47 |
| 25 | 1.86(Na + K) + Glu + Urea + 10 |
| 26 | 2(Na) + 0.9(Glu) + 0.93 × 0.5(Urea) + 8 |
| 27 | 0.985[1.86(Na) + 1.03(Glu) + 1.28 × 0.5(Urea)] |
| 28 | 1.36(Na) + 1.6(Glu) + 0.45(Urea) + 91.75 |
| 29 | 0.985[2(Na) + Glu + Urea + 35.2)] |
| 30 | 1.897(Na) + Glu + 0.5(Urea) + 13.5 |
| 31 | 1.9(Na + K) + Glu + 0.5(Urea) + 5 |
| 32 | 1.86(Na + K) + Glu + Urea |
| 33 | 2(Na) + 1.15(Glu) + Urea |
| 34 | 1.86(Na + K) + 1.15(Glu) + Urea + 14 |
| 35 | 1.09 × 1.86(Na) + Glu + Urea |
| 36 | 0.985(Na + K + Cl + HCO3+ Lactate + Glu + Urea + 6.5) |
| 37 | 2(Na) + Glu + Urea |