An orange colored urine is usually due to the presence of a medication.
Reasons for an orange-colored urine that has an alkaline pH:
(1) phenazopyridine (red with acid urine)
(2) Congo red
Reasons for an orange to red colored urine:
(3) warfarin sodium
Porphyria may also cause an orange-colored or orange-red urine.
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Specialty: Nephrology, Clinical Laboratory