The anion gap is a calculated value based on the concentrations of cations (positively charged ions) and anions (negatively charged ions) in the blood, used to identify the causes of metabolic acidosis.
Normal and Abnormal Values:
Normal Anion Gap:Typically ranges from 8-12 mEq/L, though some sources consider 6-12 mEq/L as normal.
High Anion Gap (> 12):Indicates metabolic acidosis, often due to conditions like ketoacidosis, lactic acidosis, or ingestion of toxins.
Low Anion Gap (< 8):Not typically associated with metabolic alkalosis; other conditions like hypoalbuminemia may cause it.
Clinical Relevance:
Anion gap helps clinicians determine the underlying cause of acid-base imbalances and guide appropriate treatment.
References:
American Association for Clinical Chemistry (AACC)
Mayo Clinic on Anion Gap
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