Ch04-9781975113285
Useful Formulae 1 1
ANION GAP (URINE)
) − U
UAG = (U
+ U
[Na + ]
[K + ]
[Cl − ]
( all in mmol/L )
• Normal = slightly positive • UAG is negative in diarrhea-induced nongap metabolic acidosis ( enhanced urinary NH 4 + excretion). • UAG is positive in distal RTA-induced nongap metabolic acidosis ( impaired urinary NH 4 + excretion). • See Chapter 15, Acid-Base Disorders, for differential diagnosis. BODY MASS INDEX
BMI = wt/(ht) 2 ( wt in kg, ht in m )
• <18.5 = underweight • 18.5-24.9 = normal weight • 25-29.9 = overweight • >30 = obese • >40 = morbidly obese CREATININE CLEARANCE/GLOMERULAR FILTRATION RATE
Estimated (Cockcroft-Gault Formula) CrCl = [(140 − age) × weight]/[serum Cr × 72] × 0.85 ( if female ) ( weight in kg, Cr in mg/dL) Estimated (MDRD) eGFR = 175 × (SCr) − 1.54 × age −0.203 × 0.742 ( if female ) × 1.21 ( if black ) ( eGFR in mL/min per 1.73m 2 , Cr in mg/dL )
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