Lots of people get Lupus without the butterfly rash.
There is no single blood test for diagnosing lupus. Systemic Lupus Erythematosis (SLE) is diagnosed using 11 criteria. IF you have 4 out of 11 it is likely you have lupus.
-- Face rash, which doctors call a malar rash, that is butterfly shaped and covers the bridge of the nose and spreads across the cheeks
-- Scaly rash, called a discoid rash, which appears as raised, scaly patches
-- Sun-related rash, which appears after exposure to sunlight
-- Mouth sores, which are usually painless
-- Joint pain and swelling that occurs in two or more joints
-- Swelling of the linings around the lungs or the heart
-- Kidney disease
-- A neurological disorder, such as seizures or psychosis
-- Low blood counts, such as low red blood count, low platelet count (thrombocyt
openia), or a low white cell count (leuk
-- Positive antinuclear antibody tests, which indicate that you may have an autoimmune disease
-- Other positive blood tests that may indicate an autoimmune disease, such as a positive double-stranded anti-DNA test, positive anti-Sm test, positive anti-phospholipid antibody test or false-positive syphilis test
Lynnwood, Lupus & Sjogren's Moderator, Dx: 2002DIAGNOSING LUPUS & HW's LUPUS 101
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