U ambulanti su rekli da je pacijentica mirna i da čeka pretragu krvi.

U ambulanti means in the clinic / at the outpatient clinic.

Here u means in, so it takes the locative case when it refers to location.
That is why ambulanta becomes ambulanti:

• ambulanta = clinic, outpatient department
• u ambulanti = in the clinic

Compare:

• u ambulanti = in the clinic
• u ambulantu = into the clinic

So in this sentence it is locative because the meaning is static location, not movement.

Su rekli is they said.

In Croatian, the 3rd person plural is often used when the speaker does not name the people specifically, much like English they said or they told me.

So here it does not necessarily mean a clearly defined group. It simply means that the staff / the people there / someone at the clinic said it.

This is very common in Croatian:

• Rekli su da... = They said that...
• Kažu da... = They say that...

It can sound natural even when the exact speaker is not important.

Croatian usually does not need subject pronouns because the verb ending already shows the person and number.

• rekli su = they said

Adding oni would be possible, but usually unnecessary unless you want contrast or emphasis:

• Oni su rekli... = They said... (and not someone else)

So the version without a pronoun is the normal neutral one.

The first da introduces the clause that the patient is calm:

• rekli da je pacijentica mirna = said that the patient is calm

The second da introduces another coordinated clause:

• i da čeka pretragu krvi = and that she is waiting for a blood test

So the structure is:

• They said [that X] and [that Y].

In English, the second that is often optional. In Croatian, repeating da is very normal and clear.

Because mirna is a predicate adjective, not a direct object.

After biti (to be), Croatian uses the adjective in the nominative, agreeing with the subject:

• pacijentica = feminine singular nominative
• mirna = feminine singular nominative

So:

• pacijentica je mirna = the patient is calm

You would use mirnu only in a different structure, for example as a direct object or after certain verbs/prepositions.

Yes. Pacijentica is specifically a female patient.

Croatian distinguishes grammatical and natural gender here:

• pacijent = male patient / patient in a general masculine form
• pacijentica = female patient

Because the noun is feminine, the adjective also has to be feminine:

• pacijentica je mirna
• pacijent je miran

Pretragu is in the accusative singular because it is the direct object of čeka (is waiting for).

Base form:

• pretraga = examination, test

Accusative singular:

• pretragu

So:

• čeka pretragu = is waiting for the test/examination

This is a common pattern in Croatian, where čekati takes a direct object in the accusative.

Krvi is the genitive singular of krv (blood).

In pretraga krvi, the second noun tells you what kind of test it is:

• pretraga krvi = examination/test of blood = blood test

This is a very common noun + genitive structure in Croatian:

• čaša vode = glass of water
• boja auta = color of the car
• pretraga krvi = blood test

So krvi means of blood here.

Yes, you could. Both are understandable.

• pretraga krvi = blood test, literally test of blood
• krvna pretraga = blood test, using an adjective

In medical or formal language, both types of expression can appear. In everyday use, pretraga krvi sounds very natural.

You may also hear even more common alternatives depending on context, such as:

• krvna slika
• vađenje krvi
• nalaz krvi

These are not always exact synonyms, but they are related medical expressions.

Yes, the present tense here suggests a current situation: she is calm and is waiting.

• je mirna = she is calm
• čeka pretragu krvi = she is waiting for a blood test

Croatian uses the present tense here just like English does for a current state or ongoing situation.

If the sentence were about the future, the wording would normally change, for example:

• čekat će pretragu krvi = she will wait for a blood test

But in your sentence, the meaning is that this is her current status.

Yes. Croatian word order is fairly flexible, although some versions sound more neutral than others.

The original sentence:

• U ambulanti su rekli da je pacijentica mirna i da čeka pretragu krvi.

This is a natural neutral order, with the location placed first.

You could also say:

• Rekli su u ambulanti da je pacijentica mirna i da čeka pretragu krvi.

That is also understandable, but the emphasis changes slightly. Starting with u ambulanti helps frame the setting immediately and sounds very natural in reporting.

So the word order can move, but the original version is a good standard model.

Not exactly.

Ambulanta usually refers to a clinic, doctor’s office, outpatient department, or a place where patients are seen without being admitted as hospital inpatients.

So it is not the same as:

• bolnica = hospital

Depending on context, ambulanta can mean a small clinic, a medical office, or a department where outpatient care is given.