Felis ISSN 2398-2950

Discolored urine

Introduction

  • Normal urine is yellow to amber in color.
  • Depth and nature of color is related to urine volume and presence of pigments.
  • Cause: most common are hematuria, hemoglobinuria and bilirubinuria.
  • Signs: discoloration of urine.
  • Diagnosis: visual inspection, dipstick, urine sediment examination, blood biochemistry and hematology.
  • Treatment: depends on etiology.
  • Prognosis: depends on etiology.
Print off the owner factsheet Collecting a urine sample Collecting a urine sample to give to your client.

Pathogenesis

Etiology

  • Related to color of urine.

Deep yellow

  • Quinacrine.

Yellow-orange

  • Bilirubin.
  • Fluorescein.
  • Concentrated urine.
  • Sulfasalazine Sulfasalazine.

Yellow-green or yellow-brown

  • Bilirubin.
  • Biliverdin.

Brown-black

Brown or rust-yellow

Red-brown

  • Methemoglobin.
  • Myoglobin.
  • Erythrocytes.
  • Hemoglobin.
  • Dilantin.
  • Dinitrophenol.
  • Chronic lead Lead toxicity or mercury poisoning.

Red-purple

  • Porphyrins.
  • Phenolphthalein.

Red-orange

  • Rifampin.
  • Phenazopyridine.

Red

Blue

  • Methylene blue.

Blue-green

Dark green

  • Phenols.

Milky

  • Pyuria.
  • Lipiduria.

Pathophysiology

Timecourse

  • Days to months before presentation, depending on cause.

Diagnosis

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Treatment

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Outcomes

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Barlough J E, Osborne C A, Stevens J B (1981) Canine and feline urinalysis - value of macroscopic and microscopic examinations. JAVMA 178 (1), 61-63 PubMed.


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