证据评分
荨麻疹减轻及红斑或血管性水肿消退：有低级别证据支持苯海拉明联合雷尼替丁能改善变应性反应的治疗结果。[25]Lin RY, Curry A, Pesola GR, et al. Improved outcomes in patients with acute allergic syndromes who are treated with combined H1 and H2 antagonists. Ann Emerg Med. 2000;36:462-468.http://www.ncbi.nlm.nih.gov/pubmed/11054200?tool=bestpractice.com
系统评价或者受试者＞200名的随机对照临床试验（RCT）。
荨麻疹减轻及红斑或血管性水肿消退：有低级别证据支持苯海拉明联合雷尼替丁能改善变应性反应的治疗结果。[25]Lin RY, Curry A, Pesola GR, et al. Improved outcomes in patients with acute allergic syndromes who are treated with combined H1 and H2 antagonists. Ann Emerg Med. 2000;36:462-468.http://www.ncbi.nlm.nih.gov/pubmed/11054200?tool=bestpractice.com
血小板计数的改善：对于输血后紫癜，有低级别证据显示高剂量静注免疫球蛋白能改善血小板计数。[27]Anderson D, Ali K, Blanchette V, et al. Guideline on the use of intravenous immune globulin for hematologic conditions. Transfus Med Rev. 2007;21(suppl 1):S9-S56.http://www.ncbi.nlm.nih.gov/pubmed/17397769?tool=bestpractice.com
系统评价或者受试者＞200名的随机对照临床试验（RCT）。
血小板计数的改善：对于输血后紫癜，有低级别证据显示高剂量静注免疫球蛋白能改善血小板计数。[27]Anderson D, Ali K, Blanchette V, et al. Guideline on the use of intravenous immune globulin for hematologic conditions. Transfus Med Rev. 2007;21(suppl 1):S9-S56.http://www.ncbi.nlm.nih.gov/pubmed/17397769?tool=bestpractice.com
