El uvavanyo lwaphambi kokubeleka olungangeneleli Luvavanyo apho ukwazi ukubona utshintsho lwechromosomal kwi-DNA yomntwana ngegazi likamama. Inikeza ukuthembeka kwe-99% kunye Ayibeki mngcipheko kumama okanye kwi-fetus, ukukwazi ukwenza ukusuka kwiveki ye-10 yokumitha.
Ngokutsalwa kwegazi kunina, iDNA yasimahla ejikeleza kwiplasma yoomama inokubonwa. Ke, ngolandelelwano lwetekhnoloji kunye nohlalutyo oluphambili lwe-bioinformatic, ivumela ukwazi ngesondo somntwana kwaye ukhangele izinto ezingaqhelekanga ze-chromosomal njenge-trisomy 21 (i-Down syndrome), i-trisomy 13 (i-Patau syndrome), i-trisomy 18 (ehambelana ne-Edward syndrome) kunye ne-aneuploidies ehambelana neechromosome zesini.
Ulwenziwa nini uvavanyo lwaphambi kokubeleka olungangeneleli?
Enye yeenzuzo ezinkulu zovavanyo lwaphambi kokubeleka olungahlaseliyo kukuba lunokwenziwa phakathi kweeveki ze-9 kunye ne-10 zokukhulelwa. Ngelo xesha, kufuneka kube yingcali ye-gynecology ecebisa ukusebenza kovavanyo kunye ne elona xesha lifanelekileyo kwisigulane ngasinye, ngokwembali kunye neemeko zokukhulelwa.
Ukongezelela, njengoko iluvavanyo olungachaphazeliyo umama okanye imveku engekazalwa, inokuba luncedo olukhulu kulo naliphi na ibhinqa elilindele usana, kungakhathaliseki ukuba ngumntwana omnye okanye ongekazalwa. Nangona kunjalo, yi- uvavanyo olucetyiswa ngokukodwa kubasetyhini abaneminyaka yobudala engama-35 okanye ngaphezulu, ekubeni, okukhona umama emdala, kokukhona usengozini enkulu yokuba umntwana abe nengxaki yemfuza. Kukwacetyiswa kakhulu ukuba i-ultrasound ibonisa ukurhanelwa kweengxaki zemfuza kumntwana ongekazalwa, ukuba umama sele enengxaki yotshintsho lwechromosomal kwabanye abakhulelweyo okanye ukuba umama sele eneenguqu zemfuza ezinokuchaphazela umntwana ongekazalwa.
Utolikwa njani iziphumo zovavanyo lwaphambi kokubeleka olungelulo?
Uvavanyo lwaphambi kokubeleka olungangeneleliyo ivumela ukuhlolwa kunye nokufunyanwa kwezinto ezinokuthi zenzeke kwi-chromosomal yomntwana ngexesha lokukhulelwa. Luvavanyo olungenelelayo oluncinci oza kuqinisekisa ngalo ukuba akukho didi lwe-chromosomal engaqhelekanga, kodwa indlela yokutolika idatha kolu vavanyo lwaphambi kokubeleka?
Emva kokuba uvavanyo lwenziwe, iziphumo zikholisa ukuba 7-10 iintsuku. Kungoko ke kunokuthi kwenziwe izigqibo ngokusekelwe kwidatha efunyenweyo. Gcina ukhumbula ukuba iziphumo zovavanyo zingamanani kwaye iziphumo ziya kusekelwa kwipesenti:
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- Umngcipheko ophantsi okanye ongalunganga: xa uvavanyo lunegative okanye lusemngciphekweni ophantsi, oko kuthetha ukuba akukho nokwenzeka kotshintsho lwechromosomal.
- Umngcipheko ophezulu okanye okulungileyo: Ukuba uvavanyo lunayo, kuya kufuneka kwenziwe ezinye iimvavanyo zokuxilonga ukuze kuqinisekiswe ukuguqulwa kwechromosomal ngokuqinisekileyo.
- Ayigqibekanga: kumathuba ambalwa uvavanyo lwaphambi kokubeleka olungangeneleli alugqibeki. Kwimeko apho oku kusenzeka, kuyacetyiswa ukuba uluphinde uvavanyo emva kwexesha elithile.