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A few white blood cells can normally be found in the urine of healthy individuals; females tend to have slightly more than males. An increased number of WBCs is termed pyuria or leukocyturia and is associated with infection or inflammation of the urinary tract. WBCs can also appear in the urine following exercise or fever. [102]
A urine test is any medical test performed on a urine specimen. The analysis of urine is a valuable diagnostic tool because its composition reflects the functioning of many body systems, particularly the kidneys and urinary system, and specimens are easy to obtain. [1]
Assessment of the urinary tract for abnormalities such as blockage or narrowing, the presence of kidney stones, or tumours. [2] Use of duplex ultrasound to determine if there is backward flow of urine, for example in vesicoureteric reflux. Determination of how much urine is in the bladder, for example to assess for urinary retention.
It involves the use of a small catheter used to fill the bladder and record measurements. [4] What is done depends on what the presenting problem is, but some of the common tests conducted are; Post-void residual volume: Most tests begin with the insertion of a urinary catheter/transducer following complete bladder emptying by the patient.
Cystoscopy has similar indications in animals, including visualisation and biopsy of mucosa, retrieval or destruction of urinary bladder stones and diagnosis of ectopic ureters. [9] [10] [11] In turtle and tortoises, cystoscopy has additional value as it permits the visualisation of internal organs due to the thin urinary bladder wall. [12]
Through the abdominal wall, organs inside the pelvis can be seen, such as the urinary bladder or the ovaries and uterus in women. Because water is an excellent conductor for ultrasound waves, visualizing these structures often requires a well-filled urinary bladder (this means the patients has to drink plenty of water before the examination).
A systematic exam of the pelvic structures allows an assessment of the vaginal introitus (opening), pelvic floor muscles, bladder, rectum, cervix, and the area posterior to the uterus; this portion of the exam is particularly helpful for individuals with pelvic pain, as it allows an assessment of tenderness and an anatomic source of pain. [22]
Urinary casts are microscopic cylindrical structures produced by the kidney and present in the urine in certain disease states. They form in the distal convoluted tubule and collecting ducts of nephrons , then dislodge and pass into the urine, where they can be detected by microscopy .