EBMcalc Medical Calculator

Urine anion gap

Input

Urine Sodium

Urine Potassium

Urine Chloride

Result

Important: Inputs must be complete to perform calculation.

Urine Anion Gap

Decimal Precision

Data action

Include literature references: Yes No

Notes

The urine anion gap is calculated from the difference between the major measured urinary cations (Na and K) and urinary anions (Cl).
The normal value on a regular diet is -20 to -50 meq/L due to the appropriate presence of ammonium, which is an unmeasured cation.

Equations used

UrineAnionGap = (UrineSodium + UrinePotassium) - UrineChloride

References

LaGow B, et al. PDR lab advisor. 1st edition, Montvale, Thompson PDR, 2001. NLMN ID: 101305336
Pagana, KD. Mosby's manual of diagnostic and laboratory tests. 6th edition, St. Louis, Elsevier, 2018. NLMN ID: 101720784
Kee JL, Paulanka BJ, Polek C. Handbook of fluid, electrolyte, and acid-base imbalances. 3rd edition, Albany, Delmar, 2000. NLMN ID: 100883303
Halperin ML, Kamel KS, Goldstein MB. Fluid, electrolyte, and acid-base physiology : a problem-based approach. 4th edition, Philadelphia, Saunders/Elsevier, 2010. NLMN ID: 101472994

Associated Logical Observation Identifiers Names and Codes [LOINC]

Parameter	LOINC's and Suggested Units
Urine Sodium	2955-3 : mEq/L 35678-2 : mEq/L 2955-3 : mmol/L 35678-2 : mmol/L
Urine Potassium	2828-2 : mEq/L
Urine Chloride	2078-4 : mEq/L 35676-6 : mEq/L
Urine Anion Gap	47561-6 : mEq/L

This material contains content from LOINC (http://loinc.org). LOINC is copyright © 1995-2023, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license. LOINC® is a registered United States trademark of Regenstrief Institute, Inc.

Associated HCC ICD10-CM codes

N18.30

CKD stage 3 unspecified

CKD stage 3a

CKD stage 3b

CKD stage 4

CKD stage 5

ESRD

Associated ICD9-CM codes

276.9

Electrolyt/fluid dis nec

276.2

Acidosis

276.3

Alkalosis

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