Lekar će proveriti krvnu grupu pre transfuzije.

This is the standard Serbian future tense construction:

će + infinitive

So:

• lekar = doctor
• će = will
• proveriti = to check / will check

Together, Lekar će proveriti means The doctor will check.

A very common Serbian future pattern is:

• Ja ću uraditi = I will do
• On će doći = He will come
• Lekar će proveriti = The doctor will check

In everyday speech, Serbian also often uses ću/ćeš/će... + da + present tense, for example:

• Lekar će da proveri krvnu grupu

That is also natural in conversation, but the version with the infinitive is very standard and common.

Proveriti is the infinitive form, and after će Serbian normally uses the infinitive in this type of sentence.

So the correct structure is:

• će proveriti

not:

• proveriti će in standard word order here
• će proverava because proverava is a present-tense form, not an infinitive

Also, proveriti is a perfective verb. That means it presents the action as a single completed whole: the doctor will carry out the check.

If you used the imperfective verb proveravati, it would suggest repeated or ongoing checking, which does not fit this sentence as well.

This is a question of aspect, which is very important in Serbian.

• proveriti = perfective
• proveravati = imperfective

In this sentence, proveriti means the doctor will perform the check as a completed action before the transfusion.

Compare:

• Lekar će proveriti krvnu grupu.
  The doctor will check the blood type.
  → one completed check

• Lekar će proveravati rezultate.
  The doctor will be checking the results.
  → repeated, ongoing, or process-focused

English does not mark this contrast as strongly, so learners often need time to get used to it.

Because krvna grupa is the direct object of the verb proveriti, it has to go into the accusative case.

The base form is:

• krvna grupa = blood group / blood type

This is a feminine noun phrase. In the accusative singular, feminine adjectives ending in -a change to -u, and feminine nouns ending in -a also change to -u:

• krvna → krvnu
• grupa → grupu

So:

• krvna grupa = nominative
• krvnu grupu = accusative

That is why the sentence uses krvnu grupu.

Because in Serbian, adjectives must agree with the noun they modify.

krvna is an adjective meaning blood-related / blood grupa is the noun meaning group

Since grupa is:

• feminine
• singular
• accusative

the adjective must match those same features.

So both words change together:

• nominative: krvna grupa
• accusative: krvnu grupu
• genitive: krvne grupe

This agreement is normal in Serbian and happens with adjectives, pronouns, and some numerals.

Because the preposition pre requires the genitive case.

The basic form is:

• transfuzija = transfusion

After pre meaning before, Serbian uses the genitive:

• pre transfuzije = before the transfusion

So:

• nominative: transfuzija
• genitive: transfuzije

This is a very common pattern. For example:

• pre ručka = before lunch
• pre operacije = before the operation
• pre transfuzije = before the transfusion

It can often mean either, depending on context.

Serbian has no articles like a or the, so transfuzije does not itself tell you whether English should use a or the.

So pre transfuzije could be understood as:

• before transfusion
• before the transfusion
• sometimes even before a transfusion

In a medical sentence like this, English would most naturally say before the transfusion if a specific procedure is being discussed.

Context decides the best English article, not the Serbian noun form itself.

Because Serbian does not have articles like English a/an/the.

So:

• lekar can mean doctor, a doctor, or the doctor
• krvna grupa can mean blood type, a blood type, or the blood type

You figure out the intended meaning from context.

In this sentence, English usually translates it as:

• The doctor will check the blood type before the transfusion.

But Serbian does not need separate words for the.

Yes. Serbian word order is fairly flexible because case endings show the grammatical roles.

The neutral order here is:

• Lekar će proveriti krvnu grupu pre transfuzije.

But other orders are also possible, for example:

• Lekar će pre transfuzije proveriti krvnu grupu.
• Krvnu grupu će lekar proveriti pre transfuzije.

These versions may shift the emphasis slightly, but the meaning stays basically the same.

Still, not every order sounds equally natural in every context. The original sentence is straightforward and neutral.

They are close, but not always identical.

• lekar = physician / doctor in the medical sense
• doktor can also mean doctor, but it can additionally mean someone with a doctorate

In everyday speech, many people do say doktor for a medical doctor. However, lekar is often a bit more specifically medical and formal.

So in a medical sentence like this, lekar is a very natural choice.

Yes. That is a very common alternative in spoken Serbian.

You can say:

• Lekar će proveriti krvnu grupu.
• Lekar će da proveri krvnu grupu.

Both mean the same thing: The doctor will check the blood type.

The first version uses:

• će + infinitive

The second uses:

• će + da + present tense

Both are normal, though style preferences can vary by region, register, and speaker.

Yes. krvna grupa literally means blood group, and it is the normal Serbian term for what English often calls blood type.

So:

• krv = blood
• krvna = blood-related / blood
• grupa = group

In medical usage, krvna grupa is the standard expression.

Lekar is in the nominative singular because it is the subject of the sentence.

The subject is the person performing the action:

• Lekar = the doctor
• će proveriti = will check

So the pattern is:

• Lekar = subject, nominative
• krvnu grupu = direct object, accusative
• pre transfuzije = prepositional phrase with genitive

This sentence is a good example of how Serbian cases show each word’s role very clearly.