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を受けたいのです

want to undergo

→ を
phrase Rare #25,212
want to undergo Used after a noun for something you want to undergo or take, such as an examination. のです adds a polite, explanatory tone.
JA: 健康診断を受けたいのです。
EN: I’d like to have a health checkup.

診察を受けたいのです。

I’d like to see a doctor.

妊娠検査を受けたいのです。

I’d like to take a pregnancy test.

なるべく早く診察を受けたいのですが。

I’d like to see a doctor as soon as possible.

血液検査を受けたいのですが。

I’d like to get a blood test.