Thaum twg feem ntau nws rov kuaj dua?
Yuav pib nrog, nws yuav tsum tau hais tias thawj zaug ib tug poj niam nyob hauv txoj kev kawm li ib lub sij hawm luv luv, 12-13 lub lis piam. Nyob rau lub sij hawm no, cov kws kho mob tswj hwm tsim kev ua txhaum hauv kev loj hlob ntawm lub cev thiab lub tshuab. Yog tias peb tham txog pes tsawg lub lis piam ua qhov kev ntsuam xyuas 2, ces lub sij hawm ua rau nws yog 16-20 lub lis piam. Feem ntau nws tau sau rau hauv lub caij nyoog ntawm 17-19 lub lim piam. Nws yog cov lus cog tseg uas cov kws kho mob hu thaum teb cov lus nug ntawm leej niam leej txiv uas muaj pes tsawg lub lis piam thaum cev xeeb tub lawv ua qhov kev kuaj thib ob.
Lub hom phiaj ntawm txoj kev tshawb no yog dab tsi thiab nws cia li tsim nyog li cas?
Kev kuaj xyuas tau tso cai rau koj los txheeb xyuas cov poj niam uas muaj feem yuav tsim kev chromosomal abnormality hauv lawv tus menyuam. Nyob rau hauv cov ntaub ntawv no, xws li ib tug txheej txheem yog ib txwm ua thiab muaj ultrasound, biochemical ntshav kuaj. Nws yog thaum lub xeem daim ntawv ntsuam xyuas uas tau tsim muaj qee cov cim khoom, xws li: alpha-fetoprotein (AFP) , dawb estriol, neeg chorionic gonadotropin (hCG). Hauv no regard, feem ntau ntawm cov kws kho mob koj tuaj yeem hnov ob lub npe - triple test.
Kev tsim kom muaj cov concentration hauv cov ntshav ntawm ib tug poj niam cev xeeb tub ntawm cov tshuaj muaj npe saum toj no ua rau nws muaj peev xwm hais tau nrog ntau dua qhov kev pheej hmoo ntawm kev tsim kom muaj cov kab mob xws li:
- Down's syndrome (lub npe thib ob yog trisomy 21);
- Edwards 'syndrome (trisomy 18);
- cov teeb meem ntawm lub hlab ntsha neural (lub hlwb txha caj qaum thiab dawb paug, tsis muaj hlwb).
Tus txhais lus ntawm cov txiaj ntsim tau los tau licas?
Nrog rau cov sijhawm ntawm 2 lub limtiam uas tau ntsuam xyuas, peb yuav piav qhia txog qhov ntsuam xyuas tau licas.
Yuav pib nrog, nws yog qhov yuav tsum tau hais tias tsuas yog ib tus kws kho mob ua tau qhov no. Tom qab tag nrho, pauv ib qho kev qhia tshwj xeeb tsis yog qhov txhaum cai ncaj qha, tab sis tsuas yog qhia tias yuav ua li cas rau nws txoj kev loj hlob.
Piv txwv, qhov kev nce ntawm qhov hCG nyob rau hauv cov ntshav ntawm leej niam lub neej yav tom ntej yuav qhia tau hais tias yuav muaj feem ntau ntawm kev chromosomal abnormalities hauv tus me nyuam yav tom ntej, qhov tseem yuav tau gestosis. Qhov kev txo qis nyob rau theem ntawm no hormone, raws li txoj cai, qhia tau hais tias kev ua txhaum ntawm kev loj hlob ntawm lub tsho me nyuam.
Qhov tsis sib haum ntawm qhov concentration of AFP nyob rau hauv ntshav ntshav ntawm ib tug niam tom ntej yog suav tias yog ib qho kev ua txhaum ntawm cov chromosomes, qhov genome ntawm tus me nyuam yav tom ntej. Cov kab mob kis tau zoo uas tsim nyob rau hauv cov ntaub ntawv no yog teev saum toj no. Nws yuav tsum tau sau tseg tias ib qho kev nce siab hauv qhov concentration ntawm alpha-fetoprotein tuaj yeem ua rau tuag plab me ntsis.
Yog li, raws li tau pom los ntawm tsab xov xwm, kev kuaj xyuas yog hais txog cov kev tshawb fawb pom tau hais tias tsuas yog qhia tau hais tias muaj peev xwm tsim tau ib qho kev tawm tsam. Yog li ntawd, ib txwm tom qab kev soj ntsuam ntawm qhov kev tshwm sim thiab kev muaj cov ntsiab lus ntawm kev pom zoo, cov tshuaj ntsuam xyuas ntxiv yuav raug sau tseg.