What tests do I need before taking hydrochlorothiazide?

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Before taking hydrochlorothiazide (HCTZ) to treat your high blood pressure or edema, your doctor may want to run tests to check the condition of your kidneys. While taking hydrochlorothiazide, your doctor will need to routinely check your blood pressure. Depending on any other health conditions you may have, your doctor may use urine and blood tests to measure the amount of salt in your body, the health of your kidneys and to check for unwanted allergic reactions to treatment. When seeing a doctor about a thyroid condition, it's also important to tell him or her if you're taking HCTZ, because this medication can affect certain test results.