No specific test is diagnostic for SLE. SLE is marked by the presence of ANA in 97% of persons with the disease. Other antibodies include: antiDNA, antineuronal, anticoagulant, antiWBC, antiRBC, antiplatelet,antiphospholipid, antibasement membrane, antidouble-stranded DNA, antiSmith antibodies in 30% to 40% of ppl. the LE cell prep test. The ESR and CRP is not diagnostic for SLE, but may be used to monitor activity and effectiveness of therapy