hospital stay; stay in hospital
Refers to the state or period of being hospitalized. Often used in medical or administrative contexts.
在院期間は約一週間でした。
The hospital stay was about one week.
在院中の患者さんへの面
Visits to patients during their hospital stay are restricted.
length of hospital stay; number of days in hospital
Compound of 在 (ざい, 'to be at/in') and 院 (いん, 'institution, hospital').