Capillary Blood Levels Of Hydroxychloroquine And Methotrexate Are Stable For Up To 5 Years When Collected On Volumetric Absorptive Microsamplers

Background: Hydroxychloroquine (HCQ) and methotrexate (MTX) are common antirheumatic drugs used chronically by patients with systemic lupus erythematosus (SLE) and rheumatoid arthritis (RA) (1, 2). Therapeutic drug monitoring (TDM) of HCQ and MTX provides critical compliance information, but typically requires venipuncture and shipment of refrigerated blood samples to the clinical laboratory. Capillary blood collection by finger prick offers a convenient alternative to venipuncture. The long-term stability of capillary blood HCQ and MTX collected using volumetric absorptive microsamplers (VAMS) has not previously been evaluated. In this study, we evaluated the stability of capillary MTX and HCQ levels when stored on VAMS for up to 5 years.Methods: Samples of patients with RA and SLE were collected for HCQ or MTX monitoring as part of 2 clinical studies in 2015 (HCQ: n =24 vertical bar MTX: n =61) and 2017 (HCQ: n126). Venous and capillary blood samples were shipped to Exagen Inc.'s clinical laboratory. HCQ and MTXPG(3) were measured using separate LC-MS/MS methodologies. Baseline venous blood levels of HCQ and MTXPG(3) were determined within 1 week of draw and compared to capillary blood levels determined following 3 or 5 years of storage.Results: Venous blood HCQ and capillary blood MTXPG 3 determinations made at baseline were significantly different from capillary blood determinations performed following 5 years of storage at -80 degrees C. However, these differences were within the specified limits of agreement [HCQ: Avg % change after storage (CI 95%) = -7.1% (-12.6, -1.6%), p(t-test) = 0.0205, interclass correlation coefficient (ICC)- 0.96 vertical bar MTXPG(3) : Avg % change after storage (CI 95%) =13.3% (7.1, 19.4%), Pt-test = 0.0001, ICC = 0.90].Conclusion: Dried capillary blood HCQ and MTXPG(3) levels collected on VAMS are stable for up to 5 years.