5. Over a period of time, you should use all the fingers of both hands. There is no reason to prefer one finger over the others. Once you have pricked your finger, squeeze it (use a rhythmic action rather than steady pressure) with the opposite hand until the drop of blood is about ¹/16 inch (2 mm) in diameter. If flow is inadequate (see items 7 and 8 below), perform a deeper finger stick.