Abstract: THE EVALUATION OF THYROTROPIN IMMUNORADIOMETRIC ASSAY KIT（MAGNETIC SEPARATION）IN CLINICAL APPLICATION Fu Benqi Chen Mingxi Tang Zhenlin（Department of Nuclear medieine, Sichaum promicial people' s Hospital,Chengdu 610072）ABSTRACT The average recovery of the thyrotropin immunoradiometric assay（TSH IRMA ） iS（104.8±4.1）％. The coefficients of variation in intra- and interassay are 9.0％and l 5.4％， respectively.The average batch coefficient of variation is 0.0077─0.02l 6.The 95％confidence interval of serumTSH IRMA was 0.41─4.28 mIU／l in 4 5 bIood donors.The levels of TSH in l l 3 cases with hyper-thyoidism are below 0.41mIU/l in IRMA，but normal inRIA.The lecels of TSH IRMA in57 caseswith hypothyroidism are higher than normal, and have more significant positive correlation with thatof TSH RIA（r=0.9566，P＜0.01）.The resuIts show that the TSH IRMA with magnetic separationis a sensitive method for thyroid function test.Key words thyrotropin immunoradiometric assay magnetic separation