Blødningen har stoppet, det vil si at trykkbandasjen fungerer.

Blødning means bleeding or hemorrhage. The ending -en makes it the definite singular form, so blødningen means the bleeding.

This is very common in Norwegian:

• en blødning = a bleeding / a hemorrhage
• blødningen = the bleeding

Har stoppet is the present perfect tense:

• har = has
• stoppet = past participle / supine of stoppe

So Blødningen har stoppet means The bleeding has stopped.

This tense is used because something happened in the past, but the result is important now: the bleeding was happening before, and now it is no longer happening.

Yes, you could, but the nuance is slightly different.

• har stoppet focuses on the event/change: the bleeding has come to an end.
• er stoppet focuses more on the resulting state: the bleeding is stopped.

In this sentence, har stoppet sounds very natural because it describes a process that has ended.

Det vil si is a fixed expression meaning:

• that is
• that means
• in other words

So here it introduces an explanation of the first clause.

Literally, the words look like it will say, but you should not translate it word for word here. As a whole, it functions idiomatically.

Because det vil si is an idiomatic expression. In this phrase, vil does not really give a future meaning the way will often does in English.

So it is best to learn det vil si as one chunk meaning that is / that means.

At means that and introduces a subordinate clause.

So:

• det vil si = that means
• at trykkbandasjen fungerer = that the pressure bandage is working

Together: det vil si at trykkbandasjen fungerer = that means that the pressure bandage is working

In some informal speech, at may be dropped, but including it is fully standard.

Because at starts a subordinate clause, and subordinate clauses do not use the normal main-clause V2 word order.

Compare:

• Main clause: Trykkbandasjen fungerer. = The pressure bandage works / is working.
• Subordinate clause: ... at trykkbandasjen fungerer.

After at, the subject usually comes before the verb:

• at + subject + verb

So at trykkbandasjen fungerer is the correct structure.

Trykkbandasje means pressure bandage, compression bandage, or pressure dressing, depending on context.

The ending -en makes it definite:

• en trykkbandasje = a pressure bandage
• trykkbandasjen = the pressure bandage

In this sentence, it refers to the specific bandage already being used.

Fungerer literally means functions or works.

In this medical context, it means is working or is doing its job. So the sentence is saying that the pressure bandage is effective because the bleeding has stopped.

The comma separates the main statement from an explanatory comment.

• Blødningen har stoppet = the main fact
• det vil si at trykkbandasjen fungerer = the explanation or interpretation

So the comma helps show that the second part is clarifying the first part.

Yes. It sounds natural and clear, especially in a medical or first-aid context.

It is a straightforward way to say that the bleeding has stopped and that this shows the pressure bandage is working.