Обстеження підтвердило діагноз.

Because Ukrainian past tense agrees with the subject in gender and number.

Here the subject is обстеження, which is:

• singular
• neuter

So the verb in the past tense must also be neuter singular:

• masculine: підтвердив
• feminine: підтвердила
• neuter: підтвердило
• plural: підтвердили

So Обстеження підтвердило діагноз literally has the grammar of The examination confirmed the diagnosis.

It is in the accusative singular, because it is the direct object of підтвердило.

The tricky part is that for many inanimate masculine nouns, the accusative has the same form as the nominative. So:

• nominative: діагноз
• accusative: діагноз

That is why the form does not change, even though its role in the sentence is object, not subject.

You know this from a combination of meaning, word order, and verb agreement.

1. Verb agreement
   The verb підтвердило is neuter singular, which matches обстеження.

2. Meaning
   An examination confirms a diagnosis, not the other way around.

3. Word order
   The most neutral Ukrainian order is often subject + verb + object, which is exactly what you have here.

Also, if діагноз were the subject, the verb would probably be masculine singular: підтвердив.

In this context, обстеження means something like:

• examination
• medical examination
• check-up
• workup
• sometimes testing or assessment, depending on context

It is a fairly broad medical word. It does not have to mean one single test. It can refer to the overall examination process.

So in a medical context, обстеження підтвердило діагноз can mean that the examination, tests, or workup confirmed what doctors suspected.

It is a noun.

More specifically, it is a verbal noun formed from the verb обстежити / обстежувати, meaning to examine or to inspect.

So:

• обстежити = to examine
• обстеження = examination

English does the same kind of thing:

• to examine
• examination

That is why the sentence uses обстеження as the subject.

Because Ukrainian has no articles like English a and the.

So діагноз can mean:

• a diagnosis
• the diagnosis

and обстеження can mean:

• an examination
• the examination

The exact meaning depends on context.

In a real medical context, this sentence would usually be understood as The examination confirmed the diagnosis, but Ukrainian does not need separate words for that.

Yes. Ukrainian word order is more flexible than English word order.

The neutral version is:

• Обстеження підтвердило діагноз.

But you could also say:

• Діагноз підтвердило обстеження.

This still means basically the same thing, but the emphasis changes. That version puts more focus on діагноз.

So:

• Обстеження підтвердило діагноз = neutral, straightforward
• Діагноз підтвердило обстеження = stronger focus on the diagnosis

Because the verb form and context help, Ukrainian can move words around more freely than English.

Підтвердило is perfective.

It comes from підтвердити, which means to confirm in the sense of reaching a completed result.

That fits this sentence well, because the idea is that the examination did confirm the diagnosis successfully.

If you used an imperfective form, it would suggest something more ongoing, repeated, or process-oriented, which is usually not what you want here.

So the perfective verb gives the sense:

• the examination was done
• the result became clear
• the diagnosis was confirmed

Because after підтвердити, the thing being confirmed is normally the direct object, so it goes in the accusative, not the dative or genitive.

That is why you get:

• підтвердити діагноз = to confirm a/the diagnosis

not:

• підтвердити діагнозу

The form діагнозу can appear in other grammatical situations, but not as the normal direct object here.

Yes. A passive-style version is possible, for example:

• Діагноз було підтверджено обстеженням.

That means The diagnosis was confirmed by the examination.

But the original active sentence:

• Обстеження підтвердило діагноз

is very natural and direct. In Ukrainian, active sentences are often preferred when the subject is clear and natural.

Yes, it does. It sounds normal and idiomatic.

It is concise, formal enough for medical use, and easy to understand. This kind of wording is common in:

• doctor-patient communication
• medical notes
• reports
• summaries of test results

Depending on the exact context, a doctor might also use a more specific noun such as аналіз, МРТ, КТ, or дослідження, but обстеження is a very standard general term.