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Urine anion gap

 

Input
 

Urine Na		mEq/L mmol/L
Urine K		mEq/L mmol/L
Urine Cl		mEq/L mmol/L

 
Result
 
Important: Inputs must be complete to perform calculation.

 

Urine AG		mEq/L
Decimal Precision   0 1 2 3

 

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
 

UrineAG = (UrineNa + UrineK) - UrineCl

 

 

References

1. LaGow B, et al. PDR lab advisor. 1st edition, Montvale, Thompson PDR, 2001. NLMN ID: 101305336
2. Pagana, KD. Mosby's manual of diagnostic and laboratory tests. 6th edition, St. Louis, Elsevier, 2018. NLMN ID: 101720784
3. Kee JL, Paulanka BJ, Polek C. Handbook of fluid, electrolyte, and acid-base imbalances. 3rd edition, Albany, Delmar, 2000. NLMN ID: 100883303
4. 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 Na	2955-3 : mEq/L      35678-2 : mEq/L      2955-3 : mmol/L      35678-2 : mmol/L
Urine K	2828-2 : mEq/L
Urine Cl	2078-4 : mEq/L      35676-6 : mEq/L
Urine AG	47561-6 : mEq/L

 
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