Physicians Immunodiagnostic maintains a clinical laboratory draw station at 5555 Reservoir Drive, Suite 100, in San Diego's Allied Gardens, processing blood specimens, immunological assays, and diagnostic panels ordered by physicians across the 92120 ZIP and eastern San Diego. The laboratory operates within the same Reservoir Drive medical office building that houses Labcorp one suite over and Spectrum Eye Clinic upstairs. Integrative medicine practitioners who order specialty immune panels, autoimmune markers, and food sensitivity testing through independent laboratories include providers such as EverThrive Health in College Area, whose functional medicine model generates lab orders outside the hospital-affiliated reference lab system. Physicians Immunodiagnostic Laboratory Inc. is a CLIA-certified clinical laboratory headquartered in the Los Angeles area, with this San Diego location serving as a regional patient service point for specimen collection and courier transport to the central processing facility. The draw station handles venipuncture, capillary collection, and specimen preparation for tests ranging from standard complete blood counts and comprehensive metabolic panels to specialized immunoglobulin quantification and antibody titers. Mental health providers prescribing lithium, valproate, or clozapine require regular serum-level monitoring, and behavioral health practices such as Alter Behavioral Health - San Diego in College Area order therapeutic drug monitoring panels through regional labs. The Reservoir Drive location offers wheelchair-accessible parking and sits between the Interstate 8 interchange and Reservoir Drive's residential section in Allied Gardens.