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Journal of the Korean Academy of Family Medicine 1991;12(4):33-37.
Published online April 1, 1991.
Observation on Usefulness of RF(Rheumatoid Factor) for Screening Test.
Kwang Seong Kim, Jae Ho Lee, Young Lae Lee, Mi Ra Chung, Sun Gyu Kim
선별검사로서의 루마티양 인자의 유용성에 대한 고찰
김선규, 정미라, 이영래, 김광성, 이재호
부천제일병원 가정의학과 부천제일병원 임상병리과
82,104 cases of general health people were obtained from Jan. 1986 to Dec. 1989 at Korea Medical Insitiute(KMI) and an immunological studies for rheumatoid arthritis have been performed by using Latex agglutination method(RA 80 'Eiken, Eiken Chemical Co., Ltd.)
The results were as follows:
1.The sera of positive rate of qualitative test were 4,921 cases(8.2%) in male (60,204), 1,569 cases(7.2%) in female (21,900)(average 7.9%)
2. Age distribution of positive rheumatoid factor showed 119 cases(5.1%) in 10~19 year old group, 1,192 cases(5.5%) in 20~29 year old group, 2,230(7.5%) in 30~39 year old group, 1,780(9.5%) in 40~49 year old group, 906(11.5%) in 50~59 year olf group, 224(14.1%) in 60~69 year old group, 39(17.5%) in over 70 year old group. The positive rate of qualitative RF test increased with age.
3. The sera of significant titer(1 : 80 or higher) by quantitative RF test were revealed only in 1.2% among the positive sera of qualitative RF test.
From the above results, we concluded that rheumatoid factor seems to be not a good index for screening test of rheumatoid arthritis.


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