Nefrología : publicación oficial de la Sociedad Española Nefrologia
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Nefrologia
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The serum anion gap (AG) is a calculated value defined as the difference between the sum of sodium and potassium and the sum of chloride and bicarbonate concentrations. Thus, the anion gap is equal to the unmeasured cations minus the unmeasured anions (UA). To evaluate the AG changes during HDF-on line, we studied 20 patients treated with this technique. ⋯ The increase in serum albumin and pH can mask an decreased concentration of unmeasured anions in patients treated with HDF on-line. An adjusted anion gap without effect of CAA and CAP can be obtained. With the help of this adjustments the changes in some undetermined anions organic and inorganic (sulphate and others in renal failure) can be calculated.