Pielęgniarka powiedziała, że po badaniu wszystko będzie w porządku.

Because the subject pielęgniarka is feminine. In Polish past tense forms agree with the gender of the person who did the action.

• powiedział = he said
• powiedziała = she said
• powiedziało = it said

So Pielęgniarka powiedziała means The nurse said, with the form clearly showing that the nurse is female.

Pielęgniarka means nurse, specifically a female nurse, because it is a feminine noun.

The masculine form is pielęgniarz.

So this sentence is specifically about a female nurse, not just any nurse in a gender-neutral way.

In Polish, a comma is normally required before że when it introduces a subordinate clause.

So:

• Pielęgniarka powiedziała, że...

is standard punctuation.

This is different from English, where that often appears without a comma.

Że means that and introduces a reported statement.

So the structure is:

• powiedziała, że... = said that...

In English, that is often optional, but in Polish że is usually kept in this kind of sentence.

Because the preposition po requires a specific case here: the locative.

The base form is:

• badanie = examination, test, check-up

After po, it changes to:

• po badaniu = after the examination

So this is a case-governed form. You cannot normally use the dictionary form badanie after po in this meaning.

It is the locative singular form of badanie.

Declension:

• nominative: badanie
• locative: badaniu

Since po in this time-related meaning takes the locative, you get po badaniu.

Because Polish does not do English-style tense backshifting as strictly as English does.

In English, we often say:

• She said that everything would be fine

But in Polish, it is very natural to say:

• powiedziała, że wszystko będzie w porządku

literally, she said that everything will be fine

This is normal Polish. The future event is still future relative to the examination, so będzie makes perfect sense.

Because wszystko is grammatically singular in Polish.

Even though it refers to everything, Polish treats it as a singular neuter word, so the verb is singular:

• wszystko jest = everything is
• wszystko było = everything was
• wszystko będzie = everything will be

So wszystko będzie is exactly what you should expect.

Literally, w porządku means something like in order or in proper order.

Idiomatic meaning:

• okay
• fine
• all right

In this sentence, it means that things will be okay after the examination.

It is a very common everyday expression in Polish.

Yes. It is written as two separate words:

• w = in
• porządku = order, proper arrangement, the locative form used in this expression

So the correct spelling is w porządku, not one combined word.

Yes. Both are natural.

• wszystko będzie dobrze = everything will be fine
• wszystko będzie w porządku = everything will be okay / all right

They are very close in meaning.
W porządku can sound slightly more like all right / okay, while dobrze is the more basic well / fine.

Not completely. Polish word order is fairly flexible, though some versions sound more natural than others.

The original sentence:

• Pielęgniarka powiedziała, że po badaniu wszystko będzie w porządku

is natural and neutral.

You could also hear:

• Pielęgniarka powiedziała, że wszystko będzie w porządku po badaniu

But that version may put slightly different emphasis on po badaniu, and many speakers would prefer the original order.

So the original is a very good standard phrasing.

Badanie is a broad medical word. Depending on context, it can mean:

• examination
• test
• check-up
• scan
• medical assessment

In this sentence, the most natural translation is usually examination or test, but the exact English word depends on the medical situation.

Not perfectly.

A very literal version would be:

• The nurse said that after the examination everything will be in order

That is understandable, but natural English would usually be:

• The nurse said that everything would be fine after the examination
• The nurse said that after the examination everything would be all right

So the Polish grammar and the most natural English grammar do not line up word for word.

You would change both the noun and the past-tense verb form:

• Pielęgniarz powiedział, że po badaniu wszystko będzie w porządku.

Changes:

• pielęgniarka → pielęgniarz
• powiedziała → powiedział

Everything else can stay the same.