This is the 15009th most frequent Russian word.
подтвердился
"Подтвердился" means "was confirmed" in English.
In this sentence, 'подтвердился' is used in the past tense and refers to information (a diagnosis) being shown as true through examination.
Вчера его диагноз подтвердился после дополнительного анализа.
Yesterday, his diagnosis was confirmed after an additional analysis.
Here, 'подтвердился' relates to confirming a disputed or uncertain concept (a rumor) through observed actions.
Слух об их переезде подтвердился, когда они начали паковать вещи.
The rumor about their move was confirmed when they started packing things.
This usage of 'подтвердился' indicates validating scientific results through repetition and evidence.