▁Anal y zer ▁( Ro che ▁Di agnostics ▁International ▁Ltd ) ▁has ▁ 5 ▁channels ▁for ▁simultane ous ▁measurement ▁of ▁several ▁samples ▁or ▁ag on ists . ▁The ▁instrument ▁detect s ▁change ▁in ▁elect rical ▁imped ance ▁when ▁plate lets ▁aggregate ▁on ▁metal ▁electro des ▁in ▁the ▁test ▁cu v ette . ▁Each ▁cu v ette ▁contains ▁two ▁pairs ▁of ▁sensor ▁electro des , ▁each ▁of ▁which ▁measures ▁the ▁change ▁in ▁imped ance . ▁The ▁duplicate ▁sens ors ▁serve ▁as ▁an ▁integrated ▁quality ▁control , ▁and ▁the ▁analysis ▁is ▁accepted ▁if ▁the ▁correlation ▁coefficient ▁of ▁the ▁measurements ▁is ▁greater ▁than ▁ 0 . 9 8 . ▁The ▁difference ▁of ▁each ▁curve ▁from ▁the ▁mean ▁curve ▁is ▁also ▁calculated , ▁and ▁a ▁difference ▁of ▁less ▁than ▁ 2 0 % ▁is ▁accepted . ▁The ▁test ▁cu v ettes ▁also ▁contain ▁a ▁te fl on ▁co ated ▁magnetic ▁stir ring ▁bar . ▁The ▁increase ▁in ▁imped ance ▁as ▁aggreg ation ▁occurs ▁is ▁transformed ▁into ▁aggreg ation ▁units ▁( AU ) ▁and ▁pl otted ▁against ▁time ▁on ▁the ▁computer ▁screen . ▁ ▁Sample ▁The ▁manufact urer ▁recomm ends ▁the ▁use ▁of ▁h ir ud in ▁as ▁ant ico ag ul ant ▁for ▁samples ▁to ▁be ▁tested , ▁but ▁studies ▁have ▁shown ▁that ▁he par in ▁is ▁a ▁good ▁alternative . ▁ 3 0 0 ▁ µ L ▁of ▁blood ▁is ▁needed ▁for ▁each ▁analysis , ▁and ▁is ▁dil uted ▁with ▁the ▁same ▁amount ▁of ▁sal ine . ▁After ▁pip et ting ▁blood ▁and ▁sal ine ▁into