text_1: Wells 评分 ≤ 4 分 ( 低危 ) 的 患者 如果 d - 二聚体 水平 < 1 , 000 ng / mL , 则 认为 PE 可 排除 , Wells 评分 4.5 ~ 6 分 ( 中危 ) 的 患者 如果 d - 二聚体 水平 < 500 ng / mL , 则 认为 PE 可 排除 .
  
text_2: PE was considered ruled out in patients with Wells scores ≤ 4 ( low risk ) if the D @-@ dimer level was < 1000 ng / mL , and in those with scores of 4.5 to 6 ( moderate risk ) if the D @-@ dimer level was < 500 ng / mL .
  