Coloured urine

Key Information

Appropriate Tests

 

Nature of substance may be clear from clinical assessment, including diet and drug history.

Urinalysis is positive (for blood) in Haematuria, Haemoglobinuria and Myoglobinuria, although not routinely available, consider serum Creatine kinase.

Food, food dyes, drugs, including

History of ingestion of relevant foods, drugs. Colour change with addition of acid/alkali to urine.

  • Beetroot

 

  • Riboflavin

 

  • Rifampicin

 

  • Phenolphthalein (purgatives)

 

Haematuria

Urine microscopy (MCS urine).

Haemoglobinuria

Exclude haematuria by urine microscopy (MCS urine). Haemoglobin urine, Haemosiderin urine.

Myoglobinuria

Myoglobin urine. Creatine kinase serum. Not routinely available, consider serum creatine kinase.

Porphyria

Red colour may appear only if urine is left standing.

Melanoma (advanced)

Urine may darken only if left standing.

Alkaptonuria

Urine darkens if left standing. Homogenistic acid urine.