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Medical Equations |

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 (FePO
_{4}) - 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 O
_{2}(FiO_{2}) 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 by 2022 race-neutral GLI equations, ages 3 to 95
- 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, Dasgupta, 1991)
- 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 (H
_{2}FPEF 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 |

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 |

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