The U.S. FDA has allowed marketing of the first zinc transporter 8 autoantibody (ZnT8Ab) test that can help determine if a person has type 1 diabetes and not another type of diabetes. When used with other tests and patient clinical information, the test may help some people with type 1 diabetes receive timely diagnosis and treatment for their disease. Early treatment of type 1 diabetes is important in helping to prevent further deterioration of insulin producing cells.
The immune system of many people with type 1 diabetes produces ZnT8Ab, but patients with other types of diabetes (type 2 and gestational) do not. The KRONUS Zinc Transporter 8 Autoantibody (ZnT8Ab) ELISA Assay detects the presence of the ZnT8 autoantibody in a patient’s blood.
The KRONUS ZnT8Ab ELISA Assay was reviewed through the de novo premarket review pathway, a regulatory pathway for some low- to moderate-risk medical devices that are not substantially equivalent to an already legally marketed device.
The FDA reviewed data from a clinical study of 569 blood samples — 323 from patients with diagnosed type 1 diabetes and 246 samples from patients diagnosed with other kinds of diabetes, other autoimmune diseases, and other clinical conditions. The test was able to detect the ZnT8 autoantibody in 65 percent of the samples from patients with diagnosed type 1 diabetes and incorrectly gave a positive result in less than two percent of the samples from patients diagnosed with other disease.
A negative result from the test does not rule out a diagnosis of type 1 diabetes. The test should not be used to monitor the stage of disease or the response to treatment.
KRONUS Zinc Transporter 8 Autoantibody (ZnT8Ab) ELISA Assay is manufactured by KRONUS Market Development Associates, Inc. in Star, Idaho.