A pledget containing an anticoagulant for use with a blood sample is provided. The pledget includes a filler material, such as dextran, to increase the volume anticoagulant to minimize interference with free ion measurements in the blood....http://www.google.com/patents/US5093263?utm_source=gb-gplus-sharePatent US5093263 - Method of making and using a pledget composition to minimize interferences in measuring calcium ion concentration of blood
