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  Medical Equations

 

 
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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 Eosinophil Count
Absolute Lymphocyte Count
Absolute Neutrophil Count
Absolute Phagocyte Count
Absolute Reticulocyte Count
Acute Heart Failure Prediction Based on NT-proBNP and Clinical Features
Adjusted Cerebrospinal Fluid White Blood Cell Count in the Presence of Red Blood Cells
Albumin-bilirubin (ALBI) grade estimate of survival of adults with hepatocellular carcinoma (conventional and SI units)
Allowable Blood Loss
Aminoglycoside Clearance Estimate
Anion Gap Delta Delta Gradient Multicalc
Anion Gap Delta Delta Ratio Multicalc
Anion Gap in Hypoalbumin States
Anion Gap
Aris birth weight-for-gestational age percentiles, singletons, 22 to 42 weeks gestation
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, 0 to 17 years (2017 standard)
Body mass index (BMI) percentiles and Z-scores, females 2 to 20 years (CDC)
Body mass index (BMI) percentiles and Z-scores, males 2 to 20 years (CDC)
Body Mass Index for Adults (BMI Quetelet's Index)
Body Mass Index for Adults (BMI Quetelet's Index, Metric)
Body Surface Area (BSA, Du Bois Method)
Body Surface Area (BSA, Gehan and George Method)
Body Surface Area (BSA, Mosteller, square root method)
Body Surface Area Based Dosing
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 Adult Females (Patient information)
Calorie Requirements for Weight Maintenance and Weight Loss in Adult Males (Patient information)
Carbon Dioxide Production
Cardiac Output MultiCalc
Cardiac Output Using Oxygen Saturation Data Only
Cardiac Output
CDC height-for-age percentiles for females, 2 to 20 years
CDC height-for-age percentiles for males, 2 to 20 years
CDC infant growth percentiles, 0 to 36 months
CDC infant head circumference-for-age percentiles, 0 to 36 months
CDC infant length-for-age percentiles, 0 to 36 months
CDC infant weight-for-age percentiles, 0 to 36 months
CDC infant weight-for-length percentiles, 0 to 36 months
CDC weight-for-age percentiles for females, 2 to 20 years
CDC weight-for-age percentiles for males, 2 to 20 years
CDC weight-for-height percentiles for females, 77 to 121 cm
CDC weight-for-height percentiles for males, 77 to 121 cm
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
Corrected/Adjusted Age of Preterm Infants
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
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 Kinetics MultiCalc
CSF IgG Index
CSF Protein Concentration Correction in Blood Contaminated CSF

 
  D
Diffusing capacity for carbon monoxide (DLCO) corrected for anemia
Diffusing capacity for carbon monoxide (DLCO) correction of predicted value for anemia (SI units)
Digitalis Body Load
Dose Adjustment for Body Surface Area
Dose Driven IV-Drip Rate Calculator
Dynamic International Prognostic Scoring System-Plus (DIPSS-Plus) for Primary Myelofibrosis (PMF) in Adults and Adolescents

 
  E
Endotracheal tube size for children (Age 1 to 8 years)
Energy Loss Index and the Severity of Asymptomatic Aortic Stenosis
England Fraser Index for Differentiating Beta-thalassemia Trait from Iron-deficiency
Epidural Formulation Compounding Calculator
Estimated Blood Volume
Estimated Date of Delivery (EDD) by LMP and Ultrasound
Estimated Delivery Date (Patient information)
EUTOS long-term survival (ELTS) score in adults with chronic myeloid leukemia (conventional and SI units)

 
  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
Fat Free Mass, a Measure of Lean Body Weight
Fenton weight-for-gestational age percentiles, 22 to 50 weeks gestation (2007, not sex-specific)
Fractional Excretion of Amylase (Amylase to creatinine clearance ratio)
Fractional Excretion of Calcium (FECa)
Fractional Excretion of Magnesium (SI units)
Fractional Excretion of Magnesium
Fractional excretion of phosphate (FePO4)
Fractional Excretion of Sodium (FENa)
Fractional Excretion of Sodium (FENa, SI units)
Fractional Excretion of Urate
Fractional Excretion of Urea (FEUrea)
Friedewald Equation for Low Density Lipoprotein (LDL-C)
Friedewald Equation for Low Density Lipoprotein (LDL-C, SI units)
Functional Residual Capacity

 
  G
Gestational Age from Estimated Date of Delivery (EDD)
Glomerular Filtration Rate Estimation (eGFR) by AASK Equation
Glomerular Filtration Rate Estimation (eGFR) by CKD-EPI Equation (2009)
Glomerular Filtration Rate Estimation (eGFR) by CKD-EPI Equation with Creatinine and Cystatin C, without Race (2021)
Glomerular Filtration Rate Estimation (eGFR) by CKD-EPI Equation with Creatinine, without Race (2021)
Glomerular Filtration Rate Estimation (eGFR) by CKD-EPI Equation with Cystatin C, without Race (2012)
Glomerular Filtration Rate Estimation (eGFR) by CKiD U25 Equations with Creatinine and/or Cystatin C in Children and Adults ≤25 Years Old (2021)
Glomerular Filtration Rate Estimation (eGFR) by Quadratic Equation
Glomerular Filtration Rate Estimation (eGFR) by Schwartz Formula
Glomerular Filtration Rate Estimation (eGFR) by the Abbreviated MDRD Study Equation (SI units)
Glomerular Filtration Rate Estimation (eGFR) by the Abbreviated MDRD Study Equation
Glomerular Filtration Rate Estimation (eGFR) by the IDMS-Traceable MDRD Study Equation
Glomerular Filtration Rate Estimation (eGFR) by the MDRD Equation (SI units)
Glomerular Filtration Rate Estimation (eGFR) by the MDRD Equation
Glomerular Filtration Rate Estimation (eGFR) by Updated Schwartz Formula
Glycemic Assessment: A1C to Average Glucose Conversions
Gorlin Formula for Valve Area
Gravity Flow Rate Calculator
Green King Index for Differentiating Beta-thalassemia Trait from Iron-deficiency

 
  H
Height Potential: A Child's Target Height Based on Midparental Height
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 adjusted body weight for adults
Ideal Body Weight Percentage
Ideal Body Weight
In-Flight PaO2 Estimation (using PFT's)
In-Flight PaO2 Estimation
Injury Severity Score (ISS)
Inspiratory Capacity
International Normalized Ratio of Prothrombin Time (INR)
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
Lipoprotein Insulin Resistance Index (LPIR Index)
Lung Age Estimation for Smoking Cessation Counseling
Lung Volume Multicalc

 
  M
Maintenance fluid calculation for children based on daily fluid requirements
Maintenance Fluid Calculation for Children Based on Hourly Fluid Requirements
Mantle Cell Lymphoma International Prognostic Index (MIPI)
Martin Equation for Low Density Lipoprotein (LDL-C)
Mean Arterial Pressure (MAP) in Adults and Children (conventional or SI units)
Mean Corpuscular Hemoglobin Concentration
Mean Corpuscular Hemoglobin
Mean Corpuscular Volume
Mean Vascular Pressure (systemic or pulmonary)
MELD 3.0 Score EXCLUDING Serum Albumin
MELD 3.0 Score Including Serum Albumin
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 (2008) for End-Stage Liver Disease (NOT appropriate for patients under the age of 12) (SI units)
MELDNa Score (2008) for End-Stage Liver Disease (NOT appropriate for patients under the age of 12)
MELDNa Score (2016) (SI units)
MELDNa Score (2016)
Mifflin-St. Jeor Resting Energy Expenditure (REE)

 
  N
Nasal Cannula 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
Olsen infant BMI-for-gestational-age percentiles, 24 to 41 weeks gestation
Olsen infant head circumference-for-gestational-age percentiles, 23 to 41 weeks gestation
Olsen infant length-for-gestational-age percentiles, 23 to 41 weeks gestation
Olsen infant weight-for-gestational-age percentiles, 23 to 41 weeks gestation
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 in neonates, children, and adults

 
  P
paO2 / FIO2 Ratio (for MODS Calculation)
PaO2 Correction for FIO2
PASI Psoriasis Area and Severity Index
Peak Expiratory Flow Prediction in adults
Peak expiratory flow prediction in females (18 to 85 years)
Peak expiratory flow prediction in females (5 to <18 years)
Peak expiratory flow prediction in males (18 to 85 years)
Peak expiratory flow prediction in males, 5 to <18 years
Peak Expiratory Flow Variability in Asthma
PELD Score for End-Stage Liver Disease in patients less than 12 years old (original)
PELD-Cr Score for End-stage Liver Disease in patients less than 12 years old (2023 update)
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
Post-Test Probability from Sensitivity and Specificity of Multiple Test Results
Pre Test Odds from Prevalence
Pre Test Odds from Raw Data
Predicted body weight and tidal volume in adults
Predicted postoperative FEV1 following lung resection surgery (anatomic method)
Predicted postoperative FEV1 following lung resection surgery (perfusion method)
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
Probability of heart failure with preserved ejection fraction (H2FPEF score) in adults with dyspnea
Protein Bound Calcium
Protein Catabolic Rate (normalized PCR)
Protein Catabolic Rate
Pulmonary Vascular Resistance
Pulse Pressure Variation (percentage)

 
  Q
QT Interval Correction (EKG, Bazett Equation)
QT Interval Correction (EKG, Multi-Equation)
QUICKI Formula for Insulin Resistance

 
  R
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
Right Ventricular Systolic Pressure (RVSP) in Tricuspid Regurgitation
Risk Increase / Number Needed to Harm Multicalc
Risk Reduction / Number Needed to Treat Multicalc
ROX Index (Respiratory rate--oxygenation)

 
  S
Sampson Equation for Low Density Lipoprotein (LDL-C)
Sensitivity of a Test
Serum Sodium Concentration Change Considering Infused and Excreted Cations
Sodium Change in Hyperproteinemia
Sodium Change in Hypertriglyceridemia
Sodium Concentration Correction for Hyperglycemia (Emmett 2013)(conventional or SI units)
Sodium Correction in Hyperglycemia (Hillier 1999)
Sodium Correction in Hyperglycemia (Katz 1973)
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 Adult Females (Humes-Weyer formula)
Total Body Water in Adult Females (Johansson formula)
Total Body Water in Adult Females (Lee formula)
Total Body Water in Adult Females (Watson formula)
Total Body Water in Adult Males (Humes-Weyer formula)
Total Body Water in Adult Males (Johansson formula)
Total Body Water in Adult Males (Lee formula)
Total Body Water in Adult Males (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
Urine osmolal gap (UOG) (SI units)
Urine osmolal gap (UOG)

 
  V
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
Weight Loss Indices Following Bariatric Surgery in Adults
WHO assessment of malnutrition in females, 0 to 24 months
WHO assessment of malnutrition in females, 2 to 5 years
WHO assessment of malnutrition in males, 0 to 24 months
WHO assessment of malnutrition in males, 2 to 5 years
WHO infant growth percentiles, 0 to 24 months
WHO infant head circumference-for-age percentiles, 0 to 24 months
WHO infant length-for-age percentiles, 0 to 24 months
WHO infant weight-for-age percentiles, 0 to 24 months
WHO infant weight-for-length percentiles, 0 to 24 months
Winters' Formula for Expected PCO2

 
  Z
Z Score to Percentile Estimation

 

 
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