Ib fetal doppler yog tes-tuav ultrasound hloov siv los kuaj cov me nyuam lub plawv dhia rau kev saib xyuas ua ntej. Nws siv Cov nyhuv doppler los muab kev sim ua kom pom kev ntawm lub plawv dhia. Qee cov qauv kuj tau muab tso rau lub plawv dhia hauv kev ntaus ib feeb (BPM).

Fetal saib kuj tau hu ua niam thiab cov menyuam mos thiab lub mos mos, nws yog lub sensor siv los saib xyuas cov ntaub ntawv ntawm lub cev thiab cov menyuam yaus. Nws tuaj yeem paub ntau yam kev hloov pauv ntawm lub cev, ua kom nrov dua thiab ntxiv rau cov ntaub ntawv hluav taws xob, thiab tom qab ntawd xam thiab kho cov ntaub ntawv. Yog tias qhov ntsuas tau teev tseg tau dhau lawm, nws yuav ua rau lub tswb ceeb toom.