Feem ntau TF muaj nyob hauv cov ntshav, qhov nruab nrab yog li ntawm 1.20 ~ 3.25g / L. Hauv cov neeg noj qab haus huv cov quav, yuav luag tsis muaj. Thaum cov ntshav hauv txoj hnyuv, Tf hauv cov ntshav ntws mus rau hauv txoj hnyuv thiab tawm nrog cov quav, nws muaj ntau nyob rau hauv cov quav ntawm cov neeg mob ntshav hauv txoj hnyuv. Yog li ntawd, cov quav TF ua lub luag haujlwm tseem ceeb thiab tsim nyog rau kev kuaj pom cov ntshav hauv txoj hnyuv. Lub pob khoom yog qhov yooj yim, pom kev zoo uas ntes tau TF hauv cov quav tib neeg, nws muaj kev rhiab heev thiab muaj zog tshwj xeeb. Qhov kev xeem raws li kev tshwj xeeb siab ob chav tshuaj tiv thaiv sandwich reaction principle thiab kub immunochromatographic assay analysis technics, nws tuaj yeem muab cov txiaj ntsig hauv 15 feeb.