Internal Medicine Formulas

Formulas that you need to know and will get pimped on

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Anion Gap
Na - (Cl + HCO) Normal = 8-16
Calculated Osmolality
2(Na) + glucose/18 + BUN/2.8 Tip use 20 and 3 for quicker rough answer
Fractional Excretion of Sodium
FENa) = (UNa x PCr) / (PNa x UCr) x 100
Estimated true serum sodium
Measured sodium + (((Serum glucose - 100)/100) x 1.6)
Creatinine Clearance
(140 - Age)(kg) / (72 x Creatinine) multiply by 0.85 if female