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Medical Equations

 

 
Click a letter to jump to that section. Click on a link below to use a formula or criteria.
 
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

 
  A
A-a Gradient
a/A Ratio
AaPO2 Correction for FIO2
Absolute Lymphocyte Count
Absolute Neutrophil Count
Absolute Reticulocyte Count
Acute Heart Failure Prediction Based on NT-proBNP and Clinical Features
Allowable Blood Loss
Amikacin Dosing q24hr (also Kanamycin and Streptomycin)
Amikacin Dosing to Produce Desired Peak and Trough Levels
Amikacin Level Prediction from Maintenance Dosing
Amikacin Steady State Dosage Adjustment
Aminoglycoside Clearance Estimate
Amortization of Student Loans
Anion Gap Delta Delta Gradient Multicalc
Anion Gap Delta Delta Ratio Multicalc®
Anion Gap in Hypoalbumin States
Anion Gap
Ascites Albumin Gradient

 
  B
Basal Energy Expenditure (Harris-Benedict estimation)
Base Excess Determination
Bayesian Statistics I MultiCalc
Bayesian Statistics II MultiCalc
Benefit Increase / Number Needed to Treat Multicalc
Bicarbonate Deficit
Blood Ethanol Concentration Estimation
Blood Pressure Percentiles for Boys (2 - 17 years)
Blood Pressure Percentiles for Girls (2 - 17 years)
Body Mass Index (Quetelet's index)
Body Mass Index Percentiles for Boys (2 - 20 years)
Body Mass Index Percentiles for Girls (2 - 20 years)
Body Surface Area (Du Bois Method)
Body Surface Area (Gehan & George Method)
Body Surface Area (Mosteller, square root method)
Burn Injury Fluid Resuscitation (Brooke estimate)
Burn Injury Fluid Resuscitation (Demling dextran estimate)
Burn Injury Fluid Resuscitation (Evans estimate)
Burn Injury Fluid Resuscitation (Modified Brooke crystalloid estimate)
Burn Injury Fluid Resuscitation (Slater estimate)
Burn Injury Fluid Resuscitation, Adult (Parkland crystalloid estimate)

 
  C
Calcium Correction in Hypoalbuminemia (SI units)
Calcium Correction in Hypoalbuminemia
Calorie Requirements for Weight Maintenance and Weight Loss in Men (Patient information)
Calorie Requirements for Weight Maintenance and Weight Loss in Women (Patient information)
Carbon Dioxide Production
Carboplatin AUC Dose Calculation (Calvert formula)
Cardiac Output MultiCalc
Cardiac Output
CDC Height for Age Percentiles for Boys (2 - 20 years)
CDC Height for Age Percentiles for Girls (2 - 20 years)
CDC Weight for Age Percentiles for Boys (2-20 years)
CDC Weight for Age Percentiles for Girls (2-20 years)
CDC Weight for Height Percentiles for Boys (77-121 cm tall)
CDC Weight for Height Percentiles for Girls (77-121 cm tall)
CDC/NCHS Infant Growth Percentiles (<36 months)
CDC/NCHS Infant Head Circumference for Age Percentiles (<36 months)
CDC/NCHS Infant Length for Age Percentiles (<36 months)
CDC/NCHS Infant Weight for Age Percentiles (<36 months)
CDC/NCHS Infant Weight for Length Percentiles (<36 months)
Chi Square Analysis
Closing Capacity to Total Lung Volume Capacity
Closing Capacity
Closing Volume to Vital Capacity Ratio
Confidence Interval of a Binomial Proportion
Confidence Interval of a Difference Between Proportions
Confidence Interval of a Ratio of Proportions
Confidence Interval of a Ratio of Ratios
Confidence Interval of a Survey
COPE Statistic Adding Cost to Number Needed to Treat
Creatinine Clearance (measured)
Creatinine Clearance (measured, SI units)
Creatinine Clearance by Mass
Creatinine Clearance Estimate by Cockcroft-Gault Equation (SI units)
Creatinine Clearance Estimate by Cockcroft-Gault Equation with Ideal Body Weight (SI units)
Creatinine Clearance Estimate by Cockcroft-Gault Equation with Ideal Body Weight
Creatinine Clearance Estimate by Cockcroft-Gault Equation
Creatinine Clearance Estimate by Jelliffe Formula
Creatinine Clearance Estimate by Sanaka Formula (for older subjects with low muscle mass)
Creatinine Clearance Estimate for Changing Serum Creatinine
Creatinine Kinetics MultiCalc
CSF IgG Index
CSF Protein Concentration Correction in Blood Contaminated CSF
CSF WBC Correction in Blood Contaminated CSF

 
  D
Diffusing capacity for carbon monoxide (DLCO) corrected for anemia
Digitalis Body Load
Dose Adjustment for Body Surface Area
Dose Driven IV-Drip Rate Calculator

 
  E
Energy Loss Index and the Severity of Asymptomatic Aortic Setnosis
England Fraser Index for Differentiating Beta-thalassemia Trait from Iron-deficiency
Epidural Formulation Compounding Calculator
Epoprostenol (Flolan) Infusion Rate Calculator
Estimated Blood Volume
Estimated Date of Delivery (EDD) Pregnancy Calculator
Estimated Delivery Date (Patient information)

 
  F
False Negative Rate from Sensitivity and Prevalence
False Negative Ratio from Sensitivity and Prevalence
False Positive Rate from Specificity and Prevalence
False Positive Ratio from Specificity and Prevalence
Fractional Excretion of Amylase (Amylase to creatinine clearance ratio)
Fractional Excretion of Magnesium (SI units)
Fractional Excretion of Magnesium
Fractional Excretion of Sodium (SI units)
Fractional Excretion of Sodium
Fractional Excretion of Urate
Friedewald Equation for Low Density Lipoprotein (LDL-C)
Friedewald Equation for Low Density Lipoprotein (LDL-C, SI units)
Functional Residual Capacity

 
  G
Gentamicin and Tobramycin Dosing to Produce Desired Peak and Trough Levels
Gentamicin and Tobramycin Level Prediction from Maintenance Dosing
Gentamicin and Tobramycin Steady State Dosage Adjustment
Gentamicin Dosing q24hr
Gestational Age from Estimated Date of Delivery (EDD)
Glomerular Filtration Rate Estimate by CKD-EPI Equation
Glomerular Filtration Rate Estimate by Quadratic Equation
Glomerular Filtration Rate Estimate by Schwartz Formula
Glomerular Filtration Rate Estimate by the Abbreviated MDRD Study Equation (SI units)
Glomerular Filtration Rate Estimate by the Abbreviated MDRD Study Equation
Glomerular Filtration Rate Estimate by the IDMS-Traceable MDRD Study Equation
Glomerular Filtration Rate Estimate by the MDRD Equation (SI units)
Glomerular Filtration Rate Estimate by the MDRD Equation
Glycemic Assessment
Gorlin Formula for Valve Area
Green King Index for Differentiating Beta-thalassemia Trait from Iron-deficiency

 
  H
Height Potential Prediction by Mid-parental Height
Hemoglobin A1C Estimation from Mean Plasma Glucose
Hemoglobin A1C to Mean Plasma Glucose Estimation
Henderson-Hasselbach Equation
Hepatitis C Fibrosis Prediction Score
HOMA Formula: Homeostasis Model Assessment of Insulin Resistance
Housestaff Activity Index
Hyponatremia Correction Infusate Rate

 
  I
Ideal Body Weight (method of Devine) and Dosing Weight
Ideal Body Weight Percentage
Ideal Body Weight
IME Adjusted Ratio for Medical Education Medicare Payments to Teaching Hospitals
In-Flight PaO2 Estimation (using PFT's)
In-Flight PaO2 Estimation
Injury Severity Score (ISS)
Inspiratory Capacity
International Normalized Ratio of Prothrombin Time (INR)
Iron Replacement (parenteral dosing) for Iron Deficiency
IV Drip Maintenance Rate Calculator

 
  K
Kappa Measurement of Inter-observer Agreement MultiCalc
Kappa Measurement of Inter-observer Agreement: Bennett's Kappa
Kappa Measurement of Inter-observer Agreement: Cohen's Kappa
Kappa Measurement of Inter-observer Agreement: Scott's Kappa
Kt/V Dialysis Dose Barth Formula
Kt/V Dialysis Dose Basile Formula
Kt/V Dialysis Dose Daugirdas Formula
Kt/V Dialysis Dose Formulae MultiCalc
Kt/V Dialysis Dose Jindal Formula
Kt/V Dialysis Dose Kerr Formula
Kt/V Dialysis Dose Keshaviah Formula
Kt/V Dialysis Dose Lowrie Formula

 
  L
Lean Body Weight (Female)
Lean Body Weight (Male)
Lean Body Weight Based on Creatinine Production
Likelihood Ratio MultiCalc
Likelihood Ratio of Negative from Raw Data
Likelihood Ratio of Positive from Raw Data
Lung Age Estimation for Smoking Cessation Counseling
Lung Volume Multicalc

 
  M
Maintenance Fluid Calculation for Children
Mantle Cell Lymphoma International Prognostic Index (MIPI)
Mean Corpuscular Hemoglobin Concentration
Mean Corpuscular Hemoglobin
Mean Corpuscular Volume
Mean Vascular Pressure (systemic or pulmonary)
MELD score for end-stage liver disease (not appropriate for patients under the age of 12) (SI units)
MELD Score for End-Stage Liver Disease (NOT appropriate for patients under the age of 12)
MELDNa score for end-stage liver disease (not appropriate for patients under the age of 12) (SI units)
MELDNa Score for End-Stage Liver Disease (NOT appropriate for patients under the age of 12)
Mortality risk in post-operative patients with cirrhosis (SI units)
Mortality risk in post-operative patients with cirrhosis

 
  N
Nasal Canula Oxygen Fractional Inspired O2 (FIO2) Estimate
Negative Predictive Value from Raw Data
Negative Predictive Value of a Test
NIH Chronic Prostatitis Symptom Index
Normal Range for Body Weight
Number Needed to Harm (NNH) from Odds Ratio (OR) and Patient Expected Event Rate (PEER)
Number Needed to Treat (NNT) from Odds Ratio (OR) and Patient Expected Event Rate (PEER)

 
  O
Odds from Probability
Odds Ratio and Relative Risk
Osmolal Gap Calculator (SI units)
Osmolal Gap Calculator
Osmolality Estimator (serum)
Osmolar Clearance
Overall Accuracy of a Test from Raw Data
Overall Accuracy of a Test from Sensitivity, Specificity and Prevalence
Oxygen Consumption
Oxygen Content of Arterial Blood
Oxygen Content of Venous Blood
Oxygen Saturation Estimate from PO2
Oxygenation Index (OI)

 
  P
paO2 / FIO2 Ratio (for MODS Calculation)
PaO2 Correction for FIO2
PASI Psoriasis Area and Severity Index
Peak Expiratory Flow Prediction
Peak Expiratory Flow Variability in Asthma
PELD Score for End-Stage Liver Disease (patients less than 12 years old)
PFT Adjusted Predicted Values for Men MultiCalc
PFT Adjusted Predicted Values for Women MultiCalc
PFT Predicted Values for Boys MultiCalc
PFT Predicted Values for Girls MultiCalc
PFT Predicted Values for Men MultiCalc
PFT Predicted Values for Women MultiCalc
Phenytoin Free (Unbound) Drug Level (Adjusted for Hypoalbuminemia)
Phenytoin Total Drug Level (Adjusted for Hypoalbuminemia and Renal Function)
Pneumothorax Degree of Collapse
Positive Predictive Value from Raw Data
Positive Predictive Value of a Test
Post Test Odds from Pre Test Odds and Likelihood Ratio MultiCalc
Post Test Odds of a Negative from Raw Data
Post Test Odds of a Negative Result from Sensitivity Specificity and Prevalence
Post Test Odds of a Positive from Raw Data
Post Test Odds of a Positive Result from Sensitivity Specificity and Prevalence
Post Test Probability from Pre Test Probability, Sensitivity and Specificity
Post-Test Probability from Likelihood Ratios and Multiple Test Results
Pre Test Odds from Prevalence
Pre Test Odds from Raw Data
Pregnancy Gestation by LMP and Ultrasound Biometry
Pressure Adjusted Heart Rate (For MODS calculation)
Prevalence of a Finding or Disease from Test Data
Probability from Odds
Protein Bound Calcium
Protein Catabolic Rate (normalized PCR)
Protein Catabolic Rate
Pulmonary Vascular Resistance
Pulse Pressure Variation (percentage)

 
  Q
QT Interval Correction (EKG)
QUICKI Formula for Insulin Resistance

 
  R
Red Blood Cell Volume by Radionucleotide Dilution
Renal Failure Index
Residual Renal Function in Hemodialysis Patients (Kru)
Residual Volume to Total Lung Capacity Ratio
Respiratory Quotient
Reticulocyte Production Index
Right to Left Shunt Fraction Qs/Qt
Risk Increase / Number Needed to Harm Multicalc
Risk Reduction / Number Needed to Treat Multicalc

 
  S
Sensitivity of a Test
Serum Sodium Concentration Change Considering Infused and Excreted Cations
Sodium Change in Hyperproteinemia
Sodium Change in Hypertriglyceridemia
Sodium Correction in Hyperglycemia
Sodium Deficit in Hyponatremia
Specificity of a Test
Stool Osmolal Gap
Survey Sample Size with Population Correction
Survey Sample Size
Systemic Vascular Resistance
Systolic Pressure Variation (percentage)

 
  T
Time Averaged Concentration of Urea in Hemodialysis
TIPS Risk predictor / Survival predictor (Transjugular Intrahepatic Portosystemic Shunt)
Total Body Water (BIA formula)
Total Body Water Estimation Based on Weight Alone
Total Body Water in Men (Humes-Weyer formula)
Total Body Water in Men (Johansson formula)
Total Body Water in Men (Lee formula)
Total Body Water in Men (Watson formula)
Total Body Water in Women (Humes-Weyer formula)
Total Body Water in Women (Johansson formula)
Total Body Water in Women (Lee formula)
Total Body Water in Women (Watson formula)
Total Daily Energy Requirement Estimate
Total Lung Capacity
Transferrin Receptor-Ferritin Index for Diagnosis of Iron deficiency Anemia
Transferrin Saturation
Transtubular Potassium Gradient at CCD
True Negative Ratio from Specificity and Prevalence
True Positive Ratio from Sensitivity and Prevalence

 
  U
Urea Reduction Percentage in Hemodialysis (PRU)
Urea Reduction Ratio in Hemodialysis (URR)
Urinary Protein Excretion Estimation
Urine anion gap

 
  V
Vancomycin Dosing to Produce Desired Peak and Trough Levels
Vancomycin Level Prediction from Maintenance Dosing
Vancomycin Steady State Dosage Adjustment
Ventilation Index
Very Low Density Lipoprotein (VLDL)
Vital Capacity
Volume of Distribution of Urea

 
  W
Waist to Hip Ratio
Water Deficit in Hypernatremia
Weight Based Divided Dose Calculator
Weight Based Dosage Calculator
WHO Assessment of Malnutrition in Boys 0 to 2 Years Old
WHO Assessment of Malnutrition in Boys 2 to 5 years Old
WHO Assessment of Malnutrition in Girls 0 to 2 Years Old
WHO Assessment of Malnutrition in Girls 2 to 5 years Old
WHO Infant Head Circumference for Age Percentiles (<24 months)
WHO Infant Length for Age Percentiles (<24 months)
WHO Infant Weight for Age Percentiles (<24 months)
WHO Infant Weight for Length Percentiles (<24 months)
Winter's Formula for Expected PCO2

 
  Z
Z Score to Percentile Estimation

 
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All information contained in and produced by the MedCalc 3000 system is provided for educational purposes only. This information should not be used for the diagnosis or treatment of any health problem or disease. THIS INFORMATION IS NOT INTENDED TO REPLACE CLINICAL JUDGMENT OR GUIDE INDIVIDUAL PATIENT CARE IN ANY MANNER. Click here for full notice and disclaimer.
 
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