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The flakes in urine can be due to the excess Tamm horsefall proteins
or phoshate content.
Or it may be due to infection or excess albumin
Please get the repeat urine examination and culture this time.
In the first two possiblities you need not worry.
But infection and heavy proteinuria
needs further work up and treatment.
If you have any further query please let me know I would try to answer it for you.
Wish you a great health!