확진이 · 확진을
confirmed diagnosis, testing positive
Example
어제 검사를 받았는데 확진 판정이 나왔어요.
I got tested yesterday, and it came back positive.
Word parts
확 certain+진 diagnose
Literally 'certain diagnosis'.
Good to know
확진자 (confirmed patient) became an everyday word during the COVID-19 pandemic.