Can a blood test determine urinary tract infection?

A blood test alone cannot definitively diagnose a urinary tract infection (UTI). While certain abnormalities in blood test results may suggest the presence of an infection, they cannot pinpoint the specific location or type of infection, including a UTI. Blood tests typically evaluate overall systemic inflammation or specific markers related to kidney function.

The standard diagnostic test for a UTI is a urine analysis and urine culture. A urine sample is collected and analyzed for the presence of bacteria, white blood cells, and other indicators of infection. A urine culture is also performed to identify the specific bacteria causing the infection, which helps guide appropriate treatment.

Blood tests may be ordered alongside urine analysis and urine culture to assess overall health and rule out other potential causes of symptoms, such as dehydration, electrolyte imbalances, or kidney dysfunction. However, the diagnosis of a UTI primarily relies on urine analysis and urine culture.