Nephrology

What Stones are Radiopaque? (seen on KUB)

STONES SEEN ON X-RAY [70-90% of stones] calcium oxalate, calcium phosphate:: 75-85%     struvite (magnesium ammonium phosphate): 15%  [look for…

9 years ago

When to use FeUrea over FeNa?

When trying to determine the etiology of AKI (pre-renal, renal, post-renal) FeNa is often checked. It would be expected in…

9 years ago

What is the urine anion gap?

Urine AG = Urine (Na + K – Cl) NOTE: In the setting of Bicarbonate loss, kidneys will retain Bicarbonate…

9 years ago

Why does Creatinine Clearance overestimate GFR?

Creatinine is a metabolic byproduct generated from muscle breakdown. Creatinine is filtered from blood by the kidneys and is not…

9 years ago

Why does BUN increase with Pre-renal Azotemia?

The ratio is predictive of prerenal injury when BUN:Cr exceeds 20 WHY IS IT ELEVATED? In prerenal injury, urea increases…

10 years ago

Why is it inappropriate to estimate GFR in AKI with CG or MDRD?

The eGFR estimation formulas [(such as Cockcroft-Gault or MDRD)] were derived using patients at steady states, whose renal function was…

10 years ago

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