3 yr German laboratory study of 71,597 laboratory tests, found 238 positive tests for 13 myositis autoAbs in 209 patients. Pos. results due to Idiopathic inflammatory myopathy in 37(18%), other inflammatory rheum Dz 90 (43%) or NO Rheum Dx 82 (39%) https://t.co/1cQ4LmPEhL https://t.co/1UjuIMdF0M