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Published on: 5/21/2025

How Is Pus in the Urine Diagnosed?

Pus in the urine, known as pyuria, is diagnosed by examining a urine sample under a microscope to look for white blood cells.

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Explanation

Pyuria is the presence of pus in the urine, which indicates white blood cells are present. This condition is often diagnosed by taking a urine sample and examining it under a microscope. The presence of white blood cells, or leukocytes, in the urine is a key indicator of pyuria.

Diagnosis Steps:

  1. Urine Sample Collection: A clean-catch urine sample is typically collected to avoid contamination.
  2. Microscopic Examination: The urine is examined under a microscope to look for white blood cells. A high number of these cells suggests pyuria.
  3. Chemical Tests: Sometimes, chemical tests are also used to detect leukocyte esterase, an enzyme found in white blood cells, which further confirms pyuria.

Pyuria can be a sign of a urinary tract infection (UTI) or other medical conditions. It's important to follow up with a healthcare provider for further evaluation and treatment if needed.

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