Sandbox/equations

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Revision as of 23:22, 23 March 2014 by Amr Marawan (talk | contribs) (Created page with "__NOTOC__ ==Equations== ====Nephrology==== *'''Anion gap''' = ([Na+] + [K+]) − ([Cl−] + [HCO3−]) we can simplify it to: Na-(Cl+HCO3) (Typically= 12±2mEq) *'''Delta-...")
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Equations

Nephrology

  • Anion gap = ([Na+] + [K+]) − ([Cl−] + [HCO3−])

we can simplify it to: Na-(Cl+HCO3) (Typically= 12±2mEq)

  • Delta-delta(ΔΔ) = Δanion gap(calculated anion gap-expected)/ΔHCO3(24-measured HCO3)
  • Urine anion gap = Urine anion gap is calculated by subtracting the urine concentration of chloride (anions) from the concentrations of sodium plus potassium (cations)= Na+ + K+ − Cl−
  • Calculated osmoles = 2[Na+] + [Glucose]/18 + [ BUN ]/2.8 ,where [Glucose] and [BUN] are measured in mg/dL.
  • Calculated osmolarity= 2 Na + Glucose + Urea (all in mmol/L)
  • Osmolal gap= measured osmoles - calculated osmoles
  • Estimated creatinine clearance =
  • Glomerular filtration rate (GFR) = Urine concentration×Urine flow/Plasma concentration
  • Fractional Excretion of sodium =
  • Corrected sodium in hyperglycemia = measured Na + 2.4[(measured glucose-100)/100]
  • Total body water = 0.60 × IBW(ideal body weight) (× 0.85 if female and × 0.85 if elderly)
  • Free water deficit = 0.6 x weight (kg) x [(Current Na/140) - 1]
  • Trans-tubular potassium gradient (TTKG) =
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