How does renal disappointment affect blood osmolarity?

I answered on the test that it influences urine osmolarity and I be wrong. Why?

Thank you very much for your help out

Answer:
The kidneys are responsible for filtering toxins out of the blood, not out of urine. So kidney damp squib would affect blood osmolarity, not urine osmolarity. Urine is what is excreted by the kidneys as a result of the toxins that were taken out of your blood. That is why culture that are on kidney dialysis, dont have much urinary output, dialysis mechanism is removing toxins and there isnt anything to output.
increases blood osmolarity
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