Azotemia (High Blood Nitrogen Levels) - Frequently Asked Questions

Dr. Lakshmi Venkataraman
Medically Reviewed by Dr. Lakshmi Venkataraman, MD
Last Updated on Jun 28, 2018
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Frequently Asked Questions

1. Which doctor should I consult for azotemia?

You should consult a urologist or nephrologist.

2. What is the average life expectancy of patients on dialysis?

5-10 years.

3. Which substances accumulate in the blood in azotemia?

These include nitrogen waste products such as urea and creatinine.

4. Can azotemia be caused by dehydration?

Yes.

5. At what blood creatinine level should dialysis be started?

For adults it should be ≥10 mg/dL and for children ≥2 mg/dL.

6. What is FENa?

Fractional excretion of sodium (FENa) is the amount of salt (sodium) excreted through urine relative to the amount filtered and reabsorbed by the kidney. It is not a test but a calculation based on sodium and creatinine levels in the blood and urine. FENa values less than 1% indicate decreased blood flow to the kidney, which can happen with kidney damage during dehydration or heart failure. FENa values greater than 1% suggests damage intrinsic to the kidney itself.

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