Lab tests
Laboratory tests check a sample of your blood, urine, or body tissues. 
A technician or your doctor analyzes the test samples to see if your results fall within the normal
range. The tests use a range because what is normal differs from person to person.
Your doctor may also compare your results to results from previous tests.
Laboratory tests are often part of a routine checkup to look for changes in your helth.
They also help doctors diagnose medical conditions, plan or evaluate treatments, and monitor diseases.
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