▁e os in oph il ▁blood ▁count ▁greater ▁than ▁ 5 0 0 / mic rol iter , ▁or ▁hyp ere os in oph ilia , ▁i . e . ▁e os in oph il ▁blood ▁count ▁greater ▁than ▁ 1 , 5 0 0 / mic rol iter ▁Pres ence ▁of ▁mon one urop ath y ▁or ▁poly ne urop ath y ▁Un fixed ▁pul mon ary ▁in fil tr ates ▁Pres ence ▁of ▁par anas al ▁sin us ▁ab normal ities ▁Hist ological ▁evidence ▁of ▁extra vas cular ▁e os in oph ils ▁ ▁For ▁classification ▁purposes , ▁a ▁patient ▁shall ▁be ▁said ▁to ▁have ▁E G PA ▁if ▁at ▁least ▁four ▁of ▁these ▁six ▁criteria ▁are ▁positive . ▁The ▁presence ▁of ▁any ▁four ▁or ▁more ▁of ▁the ▁six ▁criteria ▁yields ▁a ▁sens itivity ▁of ▁ 8 5 % ▁and ▁a ▁specific ity ▁of ▁ 9 9 . 7 %. ▁ ▁R isk ▁strat ification ▁The ▁French ▁Vas cul itis ▁Study ▁Group ▁has ▁developed ▁a ▁five - point ▁system ▁(" five - factor ▁score ") ▁that ▁predict s ▁the ▁risk ▁of ▁death ▁in ▁Ch urg – St ra uss ▁synd rome ▁using ▁clin ical ▁present ations . ▁These ▁factors ▁are : ▁Red u ced ▁ren al ▁function ▁( cre atin ine ▁> 1 . 5 8   m g / dl ▁or ▁ 1 4 0 ▁ µ m ol / l ) ▁Prote in uria ▁( > 1 ▁g / 2 4 h ) ▁Gast ro int est inal ▁hem