What causes dark yellow urine?

Here are some... Discerning urine color can be very subjective; so, get a formal urinalysis with a properly collected fresh urine specimen to confirm your concern about dark yellow urine which may related with dehydration or certain disorders in liver or red blood cells or certain drugs like pyridium, (phenazopyridine) etc. If related with dehydration, in fact, dark yellow urine indicates you have good kidneys to concentrate urine.

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