It has been reported that some patients have been misdiagnosed with Rheumatoid Arthritis, when in fact the correct diagnosis in their specific case was Lupus.
Lupus is difficult to diagnose because signs and symptoms differ a lot between each patient. Lupus can not be diagnosed via a single test but through a combination of symptoms and signs, blood and urine tests and physical examination. The symptoms of lupus may vary over time and can be similar to many other illnesses.