如何计算Anion Gap
learn.whatIsHeading
Anion gap measures unmeasured anions in blood, helping identify metabolic acidosis causes. It's calculated from electrolyte values.
分步指南
- 1Calculate: AG = [Na⁺] - ([Cl⁻] + [HCO3⁻])
- 2Normal is 8-16 mEq/L (or 6-12 using newer methods)
- 3High AG suggests organic acid accumulation (lactate, ketones)
例题解析
输入
Na 138, Cl 104, HCO3 14
结果
AG = 20 (elevated, high AG metabolic acidosis)
Suggests lactate or ketosis
常见错误注意事项
- ✕Interpreting AG without pH/HCO3 context
- ✕Using outdated normal ranges that don't account for albumin
常见问题
When is anion gap useful?
Differentiating causes of metabolic acidosis: high AG (lactic acid, DKA) vs normal AG (diarrheal losses).
What limits anion gap interpretation?
It's only useful when acidosis is present; anion gap is normal in metabolic alkalosis despite serious pathology.
准备好计算了吗？尝试免费的 Anion Gap 计算器
自己尝试一下 →