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PRE-RENAL AKI-INVESTIGATIONS

Nephrology

PRE-RENAL AKI-INVESTIGATIONS

1. BUN:Cr ratio is typically increased to > 20.

2. Urine is very concentrated with osmolality > 400, and often > 700.

3. Urine Na + is < 20, indicating normal tubular function (and avid reabsorption of Na + to increase glomerular pressure).

4. AKl with an FE Na < 1% and a normal urine sediment +/- few granular or hyaline casts => prerenal azotemia.

5. Urine-analysis - bland U/A; occasionally granular and/or hyaline casts.


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REFERENCES

1. Wilkinson, I. (2017). Oxford handbook of clinical medicine. Oxford: Oxford University Press.
2. Hannaman, R. A., Bullock, L., Hatchell, C. A., & Yoffe, M. (2016). Internal medicine review core curriculum, 2017-2018. CO Springs, CO: MedStudy.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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