Methods: AKA was detected by IIF (indirect immunofluorescence) and RF was detected by rate nephelometry in 53 RA patients and 62 other internal disease controls.

• 方法：研究对象分RA组、非RA组，采用间接免疫荧光法检测血清AKA，速率散射比浊法检测类风湿因子(RF)；