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A medical diagnosis is when a doctor finds out what is making someone sick. Sometimes doctors can diagnose a sickness by asking the person questions and looking at the person's body. Sometimes doctors do tests. Tests can mean taking a small bit of blood, urine, or tissue which is sent to a hospital laboratory where it is tested. X-rays are another form of test. Tests are ways to see how the body is working.
When a diagnosis has been made, the doctor may recommend treatment.