How you prepare

By Mayo Clinic Staff

If your urine is being tested only for urinalysis, you can eat and drink normally before the test. If you're having other tests at the same time, you may need to fast for a certain amount of time before the test. Your doctor will give you specific instructions.

Many drugs, including nonprescription medications and supplements, can affect the results of a urinalysis. Before a urinalysis, tell your doctor about any medications, vitamins or other supplements you're taking.

Feb. 15, 2014