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Formulas

alculated Chemistry Values

ValueCalculationNormal RangeClinical significance
BUN:Creatinine ratio BUN/Creatinine 12-20 ↑ in pre or postrenal azotemia
Creatinine clearance UxVx1.73/PxSx1440 U-urine creatinine; P-plasma creatinine; V-urine volume in ml per 24hr; S-body surface ♂ 97-137 ml/min; ♀ 88-128 ml/min ↑ in renal disease
Friedewald formula LDL=Total cholesterol -HDL-(tryglicerides/5) <130 mg/dL ↑ in coronary artery disease; not valid if tryglicerides >400 mg/dL
Calculated Osmolality 1.86xNa + (glucose/18) + (BUN/2.8) + 9 275 - 295 mOsm/kg ↑ in dehydration; uremia; diabetes; alcohol intoxication ↓ in excessive H2O intake
mg/dL into mmol/L mmol/L =(mg/dL)x 10 x valence / MW
A:G ratio albumin/(total protein -albumin) 1-2.5 Reversed ratio - multiple myeloma, liver disease
Anion Gap (Na+K)-(Cl+CO2) 10-20 mEq/L ↑ in renal failure, diabetic and lactic acidosis, drugs, toxins, lab. error
Created by: Teresa_indigo