Please do NOT eat or drink after 8pm on the day before your medical check up.
健康診断/検査:medical checkup
検査日前日8時以降は何も食べたり飲んだりしないでください。
その他の例
Please do NOT eat or drink for 12 hours prior to your medical check up.
あなた検査前8時間から12時間は何も口にしないでください。
Please do not eat after 8PM on the day before the examination or breakfast on the day of the examination.
「検査前日20時以降は何も食べず朝は食事しないでください」= Please do not eat after 8PM on the day before the examination or breakfast on the day of the examination.
「検査前20時以降」= after 8PM before the examination