12 results
Atlas of Urine Microscopy Findings
 • Epithelial cells - Normal
 • Renal tubular cells - Acute
• Red cell casts ... • White cell casts ... infection • Hyaline casts ... • Granular casts ... #casts
Hematuria Workup and Diagnosis Algorithm
 • Confirm hematuria → Urinalysis >3 RBCs/HPF, exclude mimics, repeat testing
Hematuria Workup ... • Evidence of glomerular ... proteinuria, RBC casts ... if cause not identified ... by UW IM Residency
Hematuria - Differential Diagnosis Framework

Gross Hematuria: Red/Dark urine
 • 1ml blood/liter urine can induce color change
basement membrane disease ... hematuria: - RBC casts ... disease Renal ... microscopic and ... #urology #nephrology
Urine Microscopy - Casts
Acellular Casts
 • Hyaline Casts - Consists of only precipitated Tamm-Horsfell protein without
Urine Microscopy ... acute and chronic kidney ... diseases • Fatty ... #Urine #Microscopy ... #nephrology #interpretation
Causes of Chronic Kidney Disease - Differential Diagnosis Algorithm
Decreased kidney function (eGFR < 60 ml/min/1.73 m2)
Causes of Chronic ... Kidney Disease ... Atherosclerosis Glomerular ... Sterile pyuria, WBC casts ... KidneyDisease #Nephrology
Simplified Approach to Acute Kidney Injury (AKI)
1) IS THIS AN EMERGENCY? 
Is there a dialysis indication
Approach to Acute Kidney ... PROBLEM ~80% of AKI cases ... Assess UA w/ microscopy ... for WBCs, RBCs, casts ... KidneyInjury #simplified #workup
Algorithm and Differential Diagnosis of Macroscopic Hematuria
Important Historical Elements:
- Painless: suggests malignancy
- Painful: suggests calculi/infection
- Urinalysis:
RBC’s, RBC/WBC casts ... intrinsic renal disease ... Diagnosis #EM #IM ... #Urology #Hematuria ... Differential #Algorithm #Ddxof
Urinary Casts and Disease Associations
Hyaline - May be nonspecific; seen in normal individuals or during severe
Urinary Casts and ... breakdown of cellular casts ... heme-granular casts ... broad - Advanced kidney ... 34t5DgJ #Urinary #Casts
Causes of Proteinuria - Differential Diagnosis Algorithm
Persistent Proteinuria >150mg/d protein present on repeat testing including overnight
Causes of Proteinuria ... • Drugs Glomerular ... sediment - WBC/RBC casts ... polyangiitis (GPA) / microscopic ... Minimal change disease
Causes of Hematuria - Differential Diagnosis
Renal:
 - Glomerular - IgA Nephropathy, Thin basement membrane, Alport syndrome,
Causes of Hematuria ... Diagnosis Renal: - Glomerular ... Medullary sponge kidney ... necrosis, Sickle cell disease ... #urology