To get diagnosed with CIDP, you need to see a physician. This should be done when you notice tingling or numbness in your body or any motor function problems. The doctor will perform an exam and discuss your symptoms with you.  Start keeping track of your symptoms as soon as you notice them. CIDP is only diagnosed after eight weeks of symptoms. Be as honest and detailed with your symptoms as possible. CIDP is similar in some ways to several other disorders. The more your doctor knows about your symptoms, the easier it will be to distinguish one disorder from another. Be prepared to tell your doctor what symptoms you have, where in the body you feel them, what makes them worse, and what makes them better. Your doctor may perform a neurological examination to rule out related conditions or gather additional information to confirm CIDP. During a neurological examination, your doctor will probably check your reflexes since a lack of reflexes is a common symptom of CIDP.  Your doctor may also test different parts of your body to check for numbness or your ability to feel pressure or touch sensation. You may also have to do a coordination test. The doctor may check your muscle strength, muscle tone, and posture. Your doctor may order several tests to confirm CIDP — there is no one test that can confirm the diagnosis.You may need to get a nerve conduction test or  electromyography (EMG). These tests look for slow nerve function or abnormal electrical activity that signals nerve damage.  The nerves are stimulated and checked to see if they are damaged. Then, the muscles are tested to see if the muscle or nerve is the cause of the problem. These tests can help the doctor find damaged or missing myelin along the nerves. Myelin is a sheath around nerves that helps control electrical impulses. An MRI may be done to look for enlargement of the nerve roots or inflammation. Your doctor may perform additional tests to make sure there is nothing else causing your symptoms. A spinal fluid analysis will show if you have elevated protein levels or an elevated cell count, which both point to CIDP. Blood and urine tests may also be conducted to rule out other conditions.

Summary:
Go to the doctor. Undergo a neurological examination. Get tests to check your nerve function. Go through other tests to rule out other conditions.