Medical check (健康診断)

I took a medical check to extend my student visa. It is very expensive, because this check cost $370!! This hospital is too small, so I needed to go to the hospital many times. I took X-lay 2days ago and measured height and weight and took blood test yesterday.
When I took blood test, someone came into the room. And he said, “Oh! You take a lot of blood. Do you want to sell them?” Of course, it’s a joke. But this tube of the blood test is very long, which is about 20cm long. That’s why he said that.

スチューデントビザを延長するために、健康診断を受けました。すごっく高くって370ドルもした。そして病院が小さすぎるせいで、何度もいかないといけない。2日前はレントゲン。昨日は身長、体重、血液検査。という具合。
血液検査のために血を抜いてたら、だれだかしらないけどおじさんが入ってきて。「そんなに血を抜いて、売るつもりかい？」って話しかけてきた。もちろん冗談。でも、確かによくみたら20センチぐらいはある試験管に血を3本抜いてたから、そう思うのも無理ないかも^^