https://avisetest.com/patient/ctd/
Tests for 23 biomarkers and looks like it tests for 8 autoimmune disorders. From the site:

Patented CB‑CAPs biomarkers
AVISE Lupus, a component of AVISE CTD, is the only validated test that uses patented biomarkers called CB-CAPs that have been proven to outperform standard diagnosis laboratory testing in the detection of SLE.

CB-CAPs identifies significantly more lupus patients that would otherwise appear negative with conventional markers. CB-CAPs are an innovative way to measure abnormality in your immune system that is unique to lupus.

Using CB-CAPs and other lupus-associated markers, AVISE CTD employs an advanced two-tier algorithm and proprietary Index Value to help turn isolated data points into actionable information. The index result is plotted on a spectrum associated with the likelihood of the presence of lupus.