Equations
From FamMedRef
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Body Surface Area
- BSA (m²) = ( [Height(cm) x Weight(kg) ]/ 3600 )½ e.g. BSA = SQRT( (cm*kg)/3600
Endocrinology
- Corrected Calcium = (40 - albumin)x0.02 + total Calcium
Respiratory
ABG
- Total O2 blood content = Bound to Hb + Dissolved
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- PAO2
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- No pathology, at sea level: FiO2 = 0.21, Pressure = ATM (760) - Vapor (47), PaCO2 = 40
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- AaDO2
- AaDO2 = PAO2 − PaO2
- If this is greater than 15 on room air, or greater than 100 on 100% O2, suggests intrinsic lung disease
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- where VT = tidal volume, RR = respiratory rate, VE = minute ventilation
- Calculation for minute ventilation, which must be constant to maintain adequate gas exchange