The diagnostic tests for SS include unstimulated salivary secretion test and Schirmer test to assess glandular hypofunction, serological tests to detect antibodies (such as anti-Ro/SSA and anti-La/SSB antibodies), and labial salivary gland biopsy (LSGB) for evaluating autoimmunity. The gene discussed is CALR; the disease is Autoimmunity.