Hello,
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There are many causes for dark coloured urine.
Some foodstuffs and medicines also cause dark coloured urine.
Kidney stone , Infections and cancers lead to blood in urine which may appear dark in colour.
Confirm whether you are taking any drugs recently.
You need following investigations to rule out any diseases.
1.
Urinalysis for red blood cells and protein
High or low protein indicates infection.
2. Urine culture to rule out infection
3. Blood urea, nitrogen and creatinine
4.
ultrasound abdomen and pelvis.
Consult your physician with these reports.
If you have doubt, kindly reply.
Hope this helps.
Take care.