What is the likelihood of a false negative herpes type specific blood test with background of lupus (sle)?

About 0% to 9% Quest diagnostics' website states that their herpes type-specific IgG antibody test is 91-100% sensitive, so there are a few false negative results. A repeat test can be done 4-6 weeks later, if worried about a false negative. Lupus should not affect the result, but if a person is on strong immuno-suppressive therapy, his antibody production may be blocked, which may make test results unreliable.
SLE. There is always the possibility. The simplest way to rule out an error is to simply ask to have the test repeated. If you do not have symptoms and the test is same as first, it confirms the accuracy of the first test.