I-TWP ilinganiswe nini kwaye njani?
Olu pho nonongo luqhutyelwa kwithuba leeveki ezi-11 ukuya ku-13 ukuya kwe-13. Oku kuchazwa yinyaniso yokuba emva kweveki ezili-14 ukusetyenziswa kwamanzi okugqithiseleyo kufumaneka ngokuthe ngqo kwindlela yokusebenzisa i-lymphatic ekhulayo kwisibeleko sesisu somntwana.
Emva kokulinganisa ubungakanani be-coccygeal-parietal, ugqirha usebenzisa i-ultrasound transducer ukufumana ixabiso le-TVP ye-fetal, eyahluka ngexesha leiveki zokukhulelwa, kwaye lifanisa ixabiso elifumaneka kwitafile. Ngeli xesha, i-liquid cutter is fixed in the form of black band on the monitor of device, kunye ne-skin-in white.
Ziphumelelani iziphumo zokulinganisa?
Yonke imimiselo ye-TVP ihlelelwe iiveki, kwaye iboniswe kwitafile ekhethekileyo. Ngoko, umzekelo, kwiiveki ezili-11, ubunzima beli khola lendawo akufanele lidlule kwi-1-2 mm, kwaye kwithuba leveki ezili-13-2.8 mm. Kule meko, ukwanda kwexabiso le parameter kwenzeka ngokumalunga ngqo nokukhula komntwana.
Ukwanda kwalathisi akusoloko kubonisa ubukho bentsholongwane. Ngoko ke, ngokwemanani-manani, abantwana aba-9 kwabangu-10, abakwa-TVP abangama-2.5-3.5 mm, bazalwa bengenazo iingxaki zempilo. Ngoko ke, ukuhlolwa kweziphumo kufuneka kwenziwe kuphela ngugqirha lowo, ngaphezu kokuthelekiswa kwamanani kunye nezicatshulwayo, uqwalasela iimpawu zomntu ngamnye ozayo. Akunjalo na ukuba umama ozayo uzama ukucacisa iziphumo ngokuzimeleyo.
Nangona kunjalo, ephakamileyo isalathisi sale parameter, mhlawumbi umntwana uya kuba ne-chromosomal engafanelekanga. Ngokomzekelo, nge-TVP elilingana no-6 mm, kunokutsho ngokuqinisekileyo ukuba umntwana ozalwe njengomphumo wokukhulelwa okunjalo uya kuba nokuphulwa kwimishini ye-chromosomal. Kwaye akuthethi nje kuphela i-Down syndrome.
Ngaloo ndlela, i-TWP, eguqukayo ngeeveki zokukhulelwa kunye nokuhlaziywa ngetafile, ibhekisela kulawo mabonakaliso avumela ukuxilongwa kwangaphambili kweengxaki zentuthuko yokukhulelwa kwe-intrauterine.