Blood in the urine, a condition known as hematuria, may indicate a serious underlying disease process. Familial hematuria (a condition in which blood in the urine runs in certain families of animals) is usually implicated in young cats, while cancer is the usual cause in older cats. Females are at greater risk for urinary tract infections that lead to blood in the urine than are males.
Symptoms of hematuria include blood in the urine, a sign in itself. Red-tinged urine, with or without abnormal frequent passage of urine will be evident. In patients with cancer, a mass may be palpated during physical examination. Abdominal pain will be evident in some patients.
Patients with a blood-clotting disorder may present with subdermal skin hemorrhages, conditions known as petechiae and ecchymoses, which appear as bruises. These discolored spots will be indicated by round, purplish, non-raised patches on the skin.
You will need to give a thorough history of your cat's health, including a background history of symptoms, and possible incidents that might have precipitated this condition. The history you provide may give your veterinarian clues as to which organs are causing secondary symptoms. Your veterinarian will perform a thorough physical exam on your cat, with a complete blood profile, including a chemical blood profile, a complete blood count, and a urinalysis. In male cats, examination of an ejaculate sample will help to identify prostatic disease.
Differential diagnoses for blood-tinged urine will include other causes for discolored urine. The common urine reagent strip tests for blood are designed to detect red blood cells, hemoglobin, or protein. Diet will also be considered. If you are supplementing your cat's diet with vitamins or anything different from a regular kibble diet, you will need to share this with your veterinarian, since substantial doses of vitamin C (ascorbic aid) may cause false-negative reagent test strip results.
Ultrasonography, radiography, and contrast radiography may be useful in obtaining a diagnosis. If any mass lesions are indicated, a biopsy may be necessary for a definitive diagnosis. A vaginoscopy in female cats, or a cystoscopy in male cats will rule out neoplasia and lower urinary tract issues.
Treatment of the hematuria will be dependent on the primary or associated diseases that are the underlying cause for the condition. Urinary tract infection may be associated with another disease involving the urinary tract, such as cancer, or urinary tract stones (urolithiasis). Or, hematuria may be caused by a condition that involves the body in general, such as with an excessive production of steroids by the adrenal glands, or diabetes. A systemic generalized condition will need to be treated before the hematuria can be resolved.
Surgery may be indicated for cases with urinary tract stones, neoplasia, and traumatic injuries to the urinary tract. Blood transfusions may be necessary if your cat has a severely low red blood cell count. Fluids will be used to treat dehydration, and antibiotics can be used to treat urinary tract infection and generalized diseases due to bacteria in the blood (bacteremia). Urolithiasis and kidney failure may require diet modification top prevent relapse.
If your cat is suffering from a clotting disorder, the blood thinner Heparin may be used to bring it under control.
Because hematuria may indicate a serious underlying disease process, ongoing treatment for your cat will be dependent on the primary or associated diseases that are related to it.
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