Standard for calibrating and/or verifying instrument accuracy

摘要

A device for use in checking and/or calibrating the accuracy with which a blood constituent concentration measuring instrument is operating. The device includes a capillary tube size member having annular bands marked on its outer surface. The bands are of predetermined axial extent and simulate centrifuged blood cell or other constituent layers. The axial dimension of each band is measured on the instrument which provides a visual indication of corresponding blood cell count. The blood cell count indicated by the instrument is then compared to the known blood count corresponding to the predetermined axial extent of the particular band measured. This device may be used to calibrate the instrument or determine the accuracy with which the instrument is operating.