近几年来,国外利用“阴离子隙”(Anion Gap,以下简称AG)作为体液酸硷紊乱的诊断指标,有一定的临床使用价值。根据细胞外液的“离子解剖”(“ionic anatomy”),所含阳离子的总和应与阴离子的总和相等。血清Na~+及K~+代表细胞外液中的阳离子,但实际上也只是全部阳离子的95%(145/155);氯化物及HCO_3~-等仅代表细胞外液中阴离子的85%(130/ In recent years, foreign use of “anion gap” (Anion Gap, hereinafter referred to as AG) as a diagnostic indicator of humoral disorders, have some clinical value. According to the “ionic anatomy” of the extracellular fluid, the sum of the cations contained should be equal to the sum of the anions. Serum Na ~ + and K ~ + represent cations in extracellular fluid, but in fact only 95% (145/155) of all cations; chloride and HCO 3 ~ - represent only 85% of the anions in extracellular fluid 130 /