を受けたいのです

would like to receive; would like to take

→ を
phrase Rare #24,306
would like to receive; would like to take Used to politely express a desire to receive or undergo something. The meaning of 受ける depends on the object, such as receiving an invitation or taking a medical examination. のです adds an explanatory or emphasizing tone.
JA: 来週、健康診断を受けたいのです。
EN: I would like to have a health checkup next week.

妊娠検査を受けたいのです

I’d like to take a pregnancy test.

診察を受けたいのです

I’d like to see a doctor.

血液検査を受けたいのです

I’d like to get a blood test.

なるべく早く診察を受けたいのです

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