The clinical site(s) will recruit subjects and test their fingerstick blood directly on the Blood Glucose Monitor Systems. Tubes of fingerstick blood will also be collected from the same subjects, centrifuged and the plasma collected and frozen for shipment to a Clinical Laboratory Improvement Amendments (CLIA)/College of American Pathologists (CAP) certified, accredited clinical chemistry laboratory for measurement on a comparative glucose analyzer. In addition, National Institute of Standards and Technology (NIST) glucose standards (965b) will be assayed on the comparative glucose analyzers to determine any bias from the true glucose values established by the reference mass spectrometry method.