CALCULATIONS

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  • Adjusted Calcium (mg/dL), only to Albumins <4.0 g/dL

    Calculation

    Total Calcium+0.8x[4.0-Albumin]

    Included In

    Adjusted Calcium Phosphorus Product

    Comprehensive Metabolic Panel

    Comprehensive Metabolic Panel w/Phosphorus

    Note

    Calculation provided only when Albumin is<4.0g/dL


    Adjusted Calcium Phosphorus Product (mg2/dL2), only to Albumins <4.0g/dL

    Calculation

    [Total Calcium (mg/dL)+0.8x{4.0-Albumin(g/dL)}]xPhosphorus

    Included In

    Adjusted Calcium Phosphorus Product

    Comprehensive Metabolic Panel 24 hours

    Note

    Calculation provided only when Albumin is<4.0g/dL


    A/G Ratio

    Calculation

    Albumin/Globulin

    Included In

    Comprehensive Metabolic Panel

    Comprehensive Metabolic Panel w/Phosphorus


    Anion GAP (mEq/L)
    Calculation Sodium – Chloride – CO2
    Included In

    Basic Metabolic Panel

    Comprehensive Metabolic Panel

    Comprehensive Metabolic Panel w/ Phosphorus

    Electrolytes

    Renal Function Panel


    Body Surface Area (m2)

    Calculation

    Adult (>= 16 years) uses DuBois and DuBois formula
    BSA (m2) = 0.007184 x Wt 0.425 x Ht 0.725

    Pediatric (< 16 years) uses Haycock formula
    BSA (m2) = 0.024265 x Wt 0.5378x Ht 0.3964

    where weight (Wt) is in kilograms and height (Ht) is in centimeters
    Included In Urine Creatinine Clearance

    Calcium Phosphorus Product (mg2/dL2)

    Calculation

    Total Calcium x Phosphorus

    Included In

    Calcium Phosphorus Product

    Adjusted Calcium Phosphorus Product

    Comprehensive Metabolic Panel w/Phosphorus


    Cholesterol/HDL Ratio

    Calculation

    Cholesterol/HDL

    Included In

    Lipid Panel (Coronary Risk Profile)


    Corrected Creatinine, 0 Hour, 2 Hour, 4 Hour (mg/dL)

    Calculation

    Creatinine at 0 or 2 or 4 Hour Dwell–(Glucose at 0 or 2 or 4 Hour Dwellx0.00010386)

    Included In

    PET, Standard

    PET, Fast – 4 Hour only


    Corrected Creatinine, 24 Hour (mg/dL)

    Calculation

    Creatinine at 24 Hour Dwell–(Glucose at 24 Hour Dwellx0.00010386)

    Included In

    PD Adequacy

    Fluid, 24 Hour Dwell


    Corrected Creatinine, Overnight (mg/dL)

    Calculation

    Creatinine Overnight Dwell–(Glucose Overnight Dwellx0.00010386)

    Included In

    Fluid, Overnight Dwell


    Corrected Creatinine D/P, 0 Hour

    Calculation

    Corrected Creatinine at 0 Hour Dwell/Plasma Creatinine at 2 Hour Dwell

    Included In

    PET, Standard


    Corrected Creatinine D/P, 2 Hour

    Calculation

    Corrected Creatinine at 2 Hour Dwell/Plasma Creatinine at 2 Hour Dwell

    Included In

    PET, Standard

    Corrected Creatinine D/P, 4Hour

    Calculation

    Corrected Creatinine at 4 Hour Dwell/Plasma Creatinine at 2 Hour Dwell

    Included In

    PET, Standard

    PET, Fast


    Creatinine Clearance, Urine (Residual Renal Creatinine Clearance)

    Calculation

    Included Urine Creatinine Clearance
    Note Where Wt is Dry Weight in kg and Ht is Height in cm.

    Creatinine Reduction Ratio

    Calculation

    [1– (Post Creatinine/Pre Creatinine)]x100

    Included In

    Post BUN w/URR, CRR

    Post BUN w/URR, Kt/V


    GFR (mL/min/1.73 m2) (IDMS-Traceable Modification of Diet in Renal Disease (MDRD)

    Calculation

    175x(Scr)-1.154x (age)-0.203x(0.742 if female)x(1.210 if African American)

    Included In

    GFR (CKD, Non Dialysis)

    Globulin (g/dL)

    Calculation

    Total Protein–Albumin

    Included In

    Comprehensive Metabolic Panel

    Comprehensive Metabolic Panel w/Phosphorus


    Glucose D/DO, 2 Hour

    Calculation

    Glucose at 2 Hour Dwell/Glucose at 0 Hour Dwell

    Included In

    PET, Standard

    Glucose D/DO, 4 Hour

    Calculation

    Glucose at 4 Hour Dwell/Glucose at 0 Hour Dwell

    Included In

    PET, Standard

    Hemoglobinx3 (g/dL)

    Calculation

    Hemoglobinx3

    Included In

    Complete Blood Count (CBC) & Differential

    Complete Blood Count (CBC) & Differential w/Reticulocytes

    Hemoglobin

    Hemoglobin & Hematocrit

    Hemogram (Complete Blood Count w/o Differential)


    Residual Urea Clearance, KrU (mL/min) - for Hemodialysis only

    Calculation

    Included In

    Residual Urea Clearance (KrU)

    Kt/V Equilibrated

    Calculation

    (0.924 x lnKt/V) – ((0.395 x lnKt/V) / (Min / 60)) + 0.056

    (Leypoldt Formula)

    Included In

    Kt/V Standard, Equilibrated, URR
    Note

    For patient dialyzing 2 or 4-6 times per week


    Kt/V Natural Log

    Calculation

    (Daugirdas II Formula)

    Included In

    Kt/V Natural Log, URR
    Kt/V Standard, Equilibrated, URR
    Note

    The K/DOQI recommendations are: Prescribed dose of hemodialysis: Kt/V of 1.3

    Delivered dose of hemodialysis: Kt/V >1.2


    Kt/V Standard

    Calculation

    (168*(1-exp(-eqKt/V))/(Min/60))/((1-exp(-eqKt/V))/eqKt/V+(168/N/(Min/60))-1)

    (Leypoldt Formula)

    Included In

    Kt/V Standard, Equilibrated, URR
    Note

    For patient dialyzing 2 or 4-6 times per week


    Low Density Lipoprotein (mg/dL)

    Calculation

    Cholesterol–(Very Low Density Lipoprotein + HDL)

    Included In

    Lipid Panel (Coronary Risk Profile)
     
    PD ADEQUACY CALCULATIONS
     
    Weekly Total Kt/V

    Calculation

    Weekly Residual Kt/V + Weekly Dialysate Kt/V
     
    Weekly Residual Kt/V

    Calculation

    ((Urine Urea Nitrogen/BUN) * (Urine Volume in mL/Urine Collection Time in minutes) * 10.08) / VSA
     
    Weekly Dialysate Kt/V 

    Calculation

    ((Dialysate Urea Nitrogen/BUN) * (24 hour Dialysate Drain Volume in mL/1000) * 7) / VSA
     
    Weekly Total Creatinine Clearance (Liters/week/1.73 m2) 

    Calculation

    Weekly Residual GFR + Weekly Dialysate Creatinine Clearance
     
    Weekly Residual GFR (Liters/week/1.73 m2) 

    Calculation

    Arithmetic Mean of Weekly Urea Clearance and Weekly Creatinine Clearance
      ((Urine Urea Nitrogen/BUN) * (Urine Volume in mL/Urine Collection Time in minutes) * 10.08) + (Urine Creatinine/Plasma Creatinine * Urine Volume in mL/Urine Collection Time in minutes * 10.08))/2*1.73/BSA

    Weekly Dialysate Creatinine Clearance (Liters/week/1.73 m2) 

    Calculation

    (Dialysate Corrected Creatinine/Plasma Creatinine) * (24 hour Dialysate Drain Volume in mL/1000) * 7 * 1.73/BSA

    Volume from Surface Area (Liters)

    Calculation

    Adult (>= 16 years) uses Hume and Wyers formula
    Male: V= -14.012934 + 0.296785 x Wt + 0.194786 x Ht
    Female: V = -35.270121 + 0.183809 x Wt + 0.344547 x Ht


    Pediatric (< 16 years) uses Friis-Hansen formula
    V = 0.135 x Wt0.666 x Ht0.535


    where weight (Wt) is in kilograms and height (Ht) is in centimeters

    Protein Nitrogen Appearance (PNA)

    Calculation


    PET FAST

    Refer to chart at the end of this Appendix.

    PET STANDARD
    Refer to chart at the end of this Appendix.

    Included In

    PD Adequacy

    Prothrombin Time (Protime): INR

    Calculation

    (PT Ratio)ISI

    PT Ratio = (Patient PT/Mean Normal PT)ISI

    Mean Normal PT = Geometric Mean

    ISI = International Sensitivity Index

    Included In

    Prothrombin Time (PT)

    % Recirculation

    Calculation

    Included In

    Recirculation Study

    Total Iron Binding Capacity (TIBC) (µg/dL)

    Calculation

    Transferrin x 1.4

    Included In

    Iron Status w/ Iron & Transferrin

    Iron Status w/ Iron, Transferrin & Ferritin


    % Transferrin Saturation

    Calculation

    (Iron/(Transferrin x 1.4)) x 100

    Included In

    Iron Status w/ Iron & Transferrin

    Iron Status w/ Iron, Transferrin & Ferritin


    Urea D/P, 0 Hour

    Calculation

    Urea at 0 Hour Dwell/Urea at 2 Hour Dwell

    Included In

    PET, Standard

    Urea D/P, 2 Hour
    Calculation Urea at 2 Hour Dwell/Urea at 2 Hour Dwell
    Included In PET, Standard

    Urea D/P, 4 Hour
    Calculation Urea at 4 Hour Dwell/Urea at 2 Hour Dwell
    Included In PET, Standard

    Urea Reduction Ratio (%)

    Calculation

    [1 – (Post BUN/Pre BUN)] x 100

    Included In

    Kt/V Jindal (Not K/DOQI Recommended
    Kt/V Natural Log, URR
    Kt/V Standard, Equilibrated, URR


    Urine Creatinine, 24 Hour (mg/24 hour)

    Calculation

    (Urine Creatinine/100) xTotal Urine Volume in mL

    Included In

    24 Hour Urine Creatinine

    Urine Urea Nitrogen, 24 Hour (g/24 hour)

    Calculation

    [(Urine Urea Nitrogen in mg/dL/100) x Total Urine Volume in mL] / 1000

    Included In

    24 Hour Urine Urea Nitrogen

    Very Low Density Lipoprotein (mg/dL)

    Calculation

    Triglycerides/5*

    Included In

    Lipid Panel(Coronary Risk Profile)

    *  Only provided if Triglycerides are<400 mg/dL

    Calculation
  • Last Updated on Tuesday, 18 December 2012 17:33