Our expert says:
I hope your doctors are still working on the problem: the next step will be to take a kidney biopsy as this can also be signs of interstitial nephritis - the fever makes me suspect infection or inflammation.
Urinary TB must be excluded by doing a IVU or intravenous urography studies as the blood tests or urine tests may not pick it up. I think you should be referred to a nephrologist if you are not yet with one.
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