Can drinking too much water give a negative result for infection?

No, excessive fluid intake does not lead to negative results in urine diagnostic test.

Urine tests are typically used to detect various molecules, cells, or bacteria in a urine sample. The concentration of these substances in urine can provide information about the health status of the individual. Drinking excessive amounts of water leads to dilution of the urine, which may result in lower concentrations of the molecules or cells of interest.

However, this does not necessarily affect the test result or make it negative.