Det kommer an på om audiogrammet viser hørselstapet.

Yes. Å komme an på is a set expression meaning to depend on.

So:

• Det kommer an på X = It depends on X
• Det kommer an på om ... = It depends on whether ...

You should learn kommer an på as a unit, not as three separate words with a literal meaning.

Here, det is a dummy subject, similar to English it in It depends on ...

It does not refer to a specific thing. It is just required to fill the subject position in the sentence.

So:

• Det kommer an på ... = It depends on ...

This is very common in Norwegian.

Here, om means whether.

So:

• om audiogrammet viser hørselstapet = whether the audiogram shows the hearing loss

Be careful: om can mean different things in different contexts, for example:

• about
• if / whether
• in (with time expressions in some cases)

In this sentence, it clearly means whether.

Because om introduces a subordinate clause. In Norwegian, subordinate clauses do not use the normal main-clause verb-second pattern.

Main clause:

• Audiogrammet viser hørselstapet.

Subordinate clause after om:

• ... om audiogrammet viser hørselstapet.

If you added ikke, you could see the subordinate-clause pattern more clearly:

• Main clause: Audiogrammet viser ikke hørselstapet.
• Subordinate clause: ... om audiogrammet ikke viser hørselstapet.

That placement of ikke is a very useful clue that you are in a subordinate clause.

Because both nouns are in the definite singular form.

Base forms:

• et audiogram = an audiogram
• et hørselstap = a hearing loss

Definite forms:

• audiogrammet = the audiogram
• hørselstapet = the hearing loss

The ending -et is the usual definite singular ending for many neuter nouns in Bokmål.

Both are neuter nouns:

• et audiogram
• et hørselstap

That is why their definite singular forms are:

• audiogrammet
• hørselstapet

A useful pattern to remember is:

• et
  • noun = indefinite neuter singular
• -et = definite neuter singular

In that clause:

• audiogrammet is the subject
• viser is the verb
• hørselstapet is the object

So the structure is:

• audiogrammet = the thing doing the showing
• viser = shows
• hørselstapet = the thing being shown

This follows normal Norwegian sentence structure.

Literally, viser means shows.

But in medical or technical contexts, English might also use:

• shows
• indicates
• reveals

So depending on style, audiogrammet viser hørselstapet could be understood as:

• the audiogram shows the hearing loss
• the audiogram indicates the hearing loss

The Norwegian verb itself is still simply viser.

No. Another common way is det avhenger av.

For example:

• Det kommer an på om audiogrammet viser hørselstapet.
• Det avhenger av om audiogrammet viser hørselstapet.

Both mean roughly the same thing: It depends on whether the audiogram shows the hearing loss.

In many everyday situations, det kommer an på sounds very natural and common.

You should think of å komme an på as a multi-word verb/expression. The pieces belong together, but in actual sentences they appear in the normal Norwegian pattern around the finite verb:

• infinitive: å komme an på
• present: kommer an på
• past: kom an på

Examples:

• Det kommer an på.
• Det kom an på været.

So yes, it is one expression, but in finite forms the verb changes as usual:

• komme
• kommer
• kom
• har kommet

The important part is to remember that the meaning depend on comes from the whole expression, not from komme alone.