If you go to a hospital, there is the possibility that you may be required to do PCV(packed cell volume) count before medication is administered especially for pregnant mothers. What instrument is used for this PCV count? How is the procedure conducted? The heamatocrit centrifuge is an important device in a hopital that is use din a PCV count for patients. This article explains more on how to use this device http://gulpmatrix.com/measure-pcv-using-microhaematocrit-centrifuge/