1. Kev soj ntsuam pom: Nyob rau hauv lub teeb ntuj, qaij lub thawv thiab saib cov phab ntsa sab hauv, hauv qab, thiab ntug seams rau tej xim residue, xim thaj ua rau thaj, los yog nplaum nplaum. Koj tuaj yeem khawb me me ntawm cov khoom ntawm phab ntsa sab hauv thiab smear rau ntawm daim ntawv dawb los xyuas seb cov xim pleev xim.
2. Kev ntsuas qhov tsw: Hauv qhov dej - qhov cua qhov chaw siab tshaj 15 degree, qhib lub thawv thiab tsis hnov tsw. Yog tias koj tuaj yeem hnov cov yam ntxwv hnyav lossis emulsion tsw ntawm cov xim, ntau dua li lub xeev tsis muaj ntxhiab ntawm lub thawv khoob, nws qhia tau tias tseem muaj cov xim seem.
3. Kev Ua Haujlwm Pabcuam: So cov phab ntsa sab hauv ntawm lub thawv nrog daim ntaub dawb huv. Yog hais tias daim ntaub yog stained los yog tawm cov nplaum nplaum, nws qhia tias muaj cov xim residue. Xwb, ncuav me me dej thiab co nws; soj ntsuam seb cov dej puas pos huab los yog xim kom paub meej tias muaj cov residue.
