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Equations

A-a O₂ Gradient
Abs Neutrophil Count
Abs Retic Count (Retic Index)
Age
Anion Gap (w/Delta Gap)
Basal Energy Expenditure
Bayes Sensitivty & Specificity
Bicarb Deficit
BMI/Surface Area
Calcium Correction in Hypoalbuminemia
Cockcroft-Gault GFR
Cardiac Output (Fick)
Corrected QT (QTc)
Corrected Sodium
CSF WBC Correction for RBCs
Endotracheal Tube Size for Children
FENa
FEUrea
Ideal Body Weight by Height
LDL (Calculated)
Maddrey's Discriminant Function
Maintenance Fluids
MDRD GFR
Mean Arterial Pressure (MAP)
Oxygenation Index
Parkland Burns
Pedi Ins & Outs
Sodium Deficit
Serum Osmolality
Stool Osmolal Gap
Transtubular Potassium Gradient
Water Deficit
Winter's Formula

Scores

APACHE II Score for ICU Mortality
APGAR Score
Cardiac Risk (Framingham)
CHADS2 Score for Afib
PORT Score / CAP Risk
Glasgow Coma Score
MELD Score
Ottawa Ankle and Pittsburgh Knee Rules
Ranson's Pancreatitis Mortality
San Francisco Syncope Rule
Strep Probability Score
TIMI Score for UA/NSTEMI
TIMI Score for STEMI
Well's Criteria for PE

Stool Osmolal Gap

Stool Osmolal Gap = Stool Osm - (2 * (Na + K) )

Causes of osmotic diarrhea include:

Bile salt deficiency
Pancreatic insufficiency
Celiac/Tropical Sprue
Whipple's Dz
Intestinal Lymphoma
Medications
Lactose Intolerance

Causes of secretory diarrhea include:

Laxative abuse
Hormonal, Endocrine Tumors

	Units: US SI
Stool Na	mEq/L
Stool K	mEq/L
Stool Osm	mOsm/kg

Stool Osmotic Gap	mOsm/kg
>100 suggests osmotic diarrhea, < 100 suggests secretory diarrhea