17 results
Polyuria - Differential Diagnosis Algorithm
Polyuria = >3L Urine output / 24 hours
Urine osmolality = 2 (Na
Diagnosis Algorithm ... Polyuria = >3L ... nutrition), Azotemia LOW ... #Differential #Diagnosis ... #Algorithm #nephrology
Fractional Excretion of Sodium - FENa
Fractional Excretion of Sodium (FENa) = (Urine Na+ x Serum Cr)
Sodium (FENa) = (Urine ... / (Serum Na+ x Urine ... - Strong Medicine ... #Sodium #nephrology ... #calculation #diagnosis
Causes of Polyuria - Differential Diagnosis
Excess Intake of Water:
 • Primary polydipsia (a.k.a. "psychogenic polydipsia")
 •
- Differential Diagnosis ... • Central Dl (Low ... Mimics (↑ urine ... - Strong Medicine ... #Causes #nephrology
Hyponatremia Differential Diagnosis Algorithm - Utilizing Uric Acid 
ADH promotes Urea/uric acid excretion along with water
Urea/uric acid excretion ... Osmolarity 2) Urine ... Osmolarity 3) Urine ... Uric Acid - Low ... #Algorithm #nephrology
Approach to Hypomagnesemia 

Fractional excretion of magnesium = (urine magnesium x serum creatinine)/ [0.7 (serum magnesium
Fractional excretion ... of magnesium = (urine ... #differential #diagnosis ... #causes #nephrology ... #magnesium #low
Causes of Hypernatremia - Differential Diagnosis Algorithm
Hypernatremia - Excess free water loss, Serum Sodium >145 mmol/L
High
- Differential Diagnosis ... diuresis (see Polyuria ... mannitol, glucosuria Low ... Urine Osmolality ... Hypernatremia #Nephrology
Metabolic Alkalosis - Urinary Chloride Algorithm
Cl- responsive metabolic alkalosis
 • Kidney loss of Cl-
alkalosis • Normal/low ... result of increased excretion ... in the proximal tubule ... #Algorithm #nephrology ... #differential #diagnosis
Normal Anion-Gap Acidosis (NAGMA) - Differential Diagnosis Framework and Workup

NAGMA
- Chem, ABG or VBG
- Calculate Anion
- Differential Diagnosis ... • Impaired H+ secretion ... • Serum K: low ... #Differential #Diagnosis ... #Workup #nephrology
Fractional Excretion of Urea - FEurea
Fractional Excretion of Urea (FEurea) = (Urine Urea x Serum Cr)
Urea (FEurea) = (Urine ... (Serum Urea x Urine ... - Strong Medicine ... #Urea #FEUrea #nephrology ... #calculation #diagnosis
Workup for Hypophosphatemia - Differential Diagnosis Framework
Rule out spurious hypophosphatemia: paraproteinemia, acute leukemia
Measure Urine Fractional Excretion
- Differential Diagnosis ... leukemia Measure Urine ... Fractional Excretion ... • Normal or Low ... Workup #phosphate #nephrology