There is no simple test for lupus. It is one of the most difficult diseases to diagnose and it can often take even experienced doctors months or even years to confirm a diagnosis. Diagnosis is usually done with clinical symptoms and labs but labs do not always confirm the disease.
I had labs that indicated something was wrong for 15 years before I became clinical sick. All that time I was healthy and felt fine. Lupus is the disease with a 1000 faces...or more.
MCTD (SLE Lupus, polymyositis, scleroderma). Diagnosed 2005. Kidney, liver, GI tract, dysphagia, raynauds, barretts esophagus, quadriplegic in 2005. Recovered and now active in downhill skiing, golf, hiking. Meds: amlodipine, benezapril, omeprazole, potassium, folic acid, vitamins, maxide.
Remain Optimistic and you can overcome.