Ubungakanani buntwanyana buxhomekeke ekuhambeni kweenkonzo, ngoko ke ukubala ubunzima bomntwana kubantwana abaninzi baya kuba yinto ephambili. Abagqirha-abanezifo zengqondo basebenzisa iifomula ezininzi ezivumela ukuba ubale ubunzima obuqikelelwayo bomntwana obususela kwiiveki ezingama-32 . Kufuneka kuqatshelwe ukuba idatha yezo zibalo zihambelana, kuba zixhomekeka kwiinkalo ezahlukeneyo, kubandakanywa nesakhiwo se-anatomiki, umlinganiselo we-amniotic fluid, isikhundla se-fetus kwisibeletho, njalonjalo.
Iifomula zokuzimisela umlinganiselo:
- OZH x VDM
Kule fomyula, ixabiso eliphambili lijikeleze isisu kunye nokuphakama kokuma kwe-uterine fundus. Umzekelo, ukuba iiveki ezingama-32 isisu esiswini sisingu-84 cm kwaye isibalo sesibini sibingama-32 cm, ngoko ubunzima bomntwana obunomntwana buyi-2688. Kubalulekile ukuphindaphinda kwakhona ukuba iziphumo zoloo zibalo zihambelana, kwaye impazamo ingaba i-200-300 g.
- (OZH + VDM) / 4 x 100
Le fomula ikuvumela ukuba ubale ubunzima bomntwana ngexesha lokukhulelwa. Kule nto, izibonakaliso ezimbini (umda wesisu kunye nokuphakama kokuma kwesibindi esezantsi) kufuneka zifakwe, zihlulwe ngamane kwaye ziphindwe ngekhulu. Ngaloo ndlela, ngenxa yamaparitha anikeziweyo, ubunzima bomntwana buza kuba yi-2900 g.
- (VDM - 12 okanye 11) x 155
Ifomula yesithathu ibonisa indlela yokubala ubunzima be-fetus, ngokuqwalasela iimpawu zesimo somfazi. Ngokwefomula ye-Solovyov, isalathisi esithile sithatyathwa kwisalathisi sokuphakama kokuma kwesibeleko esingaphantsi (12 - ukuba umgca wesandla somfazi ungaphezu kwe-12 cm, 11-ukuba ungaphantsi), kwaye ngoko inani landa ngo-155. Ngenxa yoko, kulo mzekelo ubunzima bomntwana buza kuba ngama-3100 okanye ngo-3255 igram ngokuxhomekeke kwisakhiwo somzimba womama ozayo.
Ukumiselwa kwesisindo se-fetus nge-ultrasound
Idatha echanekileyo inokufumaneka xa sibalwa ubunzima be-fetus nge-ultrasound. Ukuhlolwa kwe-ultrasound kukuvumela ukuba ungaboni kuphela ubunzima bomntwana, kodwa unxibelelwano lobukhulu bomntu ngamnye kwixesha lokukhulelwa. Ukuze ubale ubunzima be-fetus kwiiveki , kukho i-calculator ekhethekileyo. Ukuba ufaka yonke idatha ye-ultrasound, unokufumana umphumo osondele ngakumbi.
Emva kokubala ngamafomula ahlukeneyo kunye nokuqwalasela iziphumo ze-ultrasound, unako ukubala ubunzima obuchanekileyo bomntwana ekuzalweni. Kufanelekile ukukhumbula ukuba umzimba ngamnye uyedwa, ngoko ke ukuba iziphumo ziphezulu okanye ziphantsi kunezinto eziqhelekileyo, kusenokwenzeka ukuba kusasa kakhulu. Njengomthetho, imimiselo ingasetyenziswa kuphela kwisigamu sokuqala sokukhulelwa, xa umntwana sele esincinci kakhulu, kanti kwi-trimester yesithathu loo mpazamo ingafikelela kwi-500 g.