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Anion Gap Master4/5/25 8h:24min
MediCalc® | Equations | Renal | Acid-Base | AG mstr Quick Help
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Inputs
Sodium (Na<sup>+</sup>) (S) normal values: 136 - 145 mEq/L Na+ (S)
Potassium (K<sup>+</sup>) (S) normal values: 3.5 - 5.5 mEq/L K+ (S)
Chloride (Cl<sup>-</sup>) (S) normal values: 98 - 106 mEq/L Cl- (S)
Bicarbonate (HCO<sub>3</sub><sup>-</sup>) (S) normal values: 21 - 29 mEq/L HCO3- (S)
      
    
Outputs
AG (S)
Anion Gap (Serum)
AG4_S (S)
Anion Gap 4 (Serum)






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Anion Gap (serum) is expressed in mEq/L (mmol/L) and is the indirect measurement of serum anions (proteins, phosphate, sulphate and organic anions) not measured by routine lab tests.

* Increased AG acidosis: Renal insufficiency, ketoacidosis (diabetic or ETOH), lactic acidosis and drug intoxications (methanol, ethylene glycol,salicylates, paraldehide, etc). Sometimes, the AG_S may decrease as a result of accumulation of cationic proteins (myeloma) then an increase in the AG equivalent to the decrease in HCO3 strongly suggests the presence of a high AG metabolic acidosis.



Equation Parameters (Anion Gap Master)Links to Conversion
PARAMETER 1 Abbrev spcmn Normal Low Normal High Lower Limit Higher Limit C UNITS CF SI UNITS
  Inputs
Sodium Na+ S 136 145 80 200 mEq/L 1 mmol/L
Potassium K+ S 3.5 5.5 0 20 mEq/L 1 mmol/L
Chloride Cl- S 98 106 50 150 mEq/L 1 mmol/L
Bicarbonate HCO3- S 21 29 0 200 mEq/L 1 mmol/L
  Outputs
Anion Gap (Serum) AG S 8 16 -100 300 mEq/L 1 mmol/L
Anion Gap 4 (Serum) AG4_S S 8 16 -100 300 mEq/L 1 mmol/L
About the Parameters: Normal values (and limits) are expressed in C Units. Spcmn = specimen. Abbrev = abbreviation.
CF= conversion factor. Units (c) x CF = Units (si) (unless otherwise specified). Inputs in yellow background, Outputs in blue.
1 Click on the links above to go to Parameter Unit Conversion Pages.


Related Equations
Equations
Renal
Acid-Base
Anion Gap Master (AG mstr)
Anion Gap (Serum) (AG)
Anion Gap 4 (Serum) (AG4_S)
Delta Delta (DD)
Urine Anion Gap (UAG)
Acid Deficit (H_def)
Bicarbonate Deficit (HCO3_def)
Bicarbonate Excess (HCO3_xs)
Chloride Deficit (Cl_def)
Henderson - Hasselbalch Equation (HHE)
Hydrogen ion concentration (from pH) ([H+])
Hydrogen / Potassium Exchange Index (HK_ei)
Hydrogen ion (Acid Base Equation) (H+ ion)
Kassirer-Bleich Equation (KBE)
Lactate Excess (L_xs)
Metabolic Acidosis (Winter) (MetAcid)
Metabolic Alkalosis (MetAlk)
Respiratory Acidosis, acute (RespAcidA)
Respiratory Acidosis, chronic (RespAcidC)
Respiratory Alkalosis, acute (RespAlkA)
Respiratory Alkalosis, chronic (RespALkC)


Programming & Design: The ScyMed Team


MediCalc® | Equations | Renal | Acid-Base | AG mstr Quick Help
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  Warning: Physicians and Healthcare Professionals are responsible to employ good clinical judgement in selecting and interpreting Clinical data (inputs, outputs), and to verify all processing (data/knowledge) obtained through the use of Synt®, MediCalc®, iDox®, eH&P™, or any of ScyMed's systems and/or applications. Always double CHECK inputs and computer-generated outputs, data processing and original sources manually.
Normal values presented here are only a general guide. It is essential to check the values established by the specific Laboratory and/or Hospital performing the tests. 		 

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