Urine colour and appearance are among the simplest yet most informative initial indicators of urinary tract health. Normal urine ranges from pale yellow (well-hydrated) to deep amber (concentrated). Unusual colours or cloudiness can indicate a range of conditions.
Dark brown or cola-coloured urine may indicate myoglobinuria, hepatitis, or severe dehydration. Red or pink urine suggests blood (haematuria), certain foods (beetroot), or medications. Cloudy urine may indicate infection, high protein, or crystals. Foam in the urine can suggest proteinuria. Colour and appearance assessments are performed as the first step in urinalysis and guide further testing.
FAQs
Why is urine dark yellow when dehydrated?
Dehydration concentrates urine as the kidneys conserve water. Less fluid dilutes the same amount of urobilinogen and waste products, producing deeper colour. Pale colourless urine indicates excellent hydration.
What causes cloudy urine?
Infection (bacteria and white cells), protein, crystals (uric acid, calcium oxalate), and vaginal secretion contamination are common causes. Persistent cloudiness warrants dipstick and microscopy.
Can food change urine colour?
Yes. Beetroot causes pink-red urine. B vitamins cause bright yellow. Asparagus causes a distinctive odour. These are benign dietary effects.
What causes foamy urine?
Persistent foam in urine suggests proteinuria — protein reduces surface tension, creating stable bubbles. Occasional foam from rapid urinary flow is normal.
