CAIRO  - Kuwait's 90-year-old ruler has left a hospital in the United States after successfully completing medical tests, state news agency KUNA reported on Friday.

Emir Sheikh Sabah al-Ahmad al-Sabah, who has ruled the U.S. ally and OPEC oil producer since 2006, had postponed a meeting with U.S. President Donald Trump planned for this week after being admitted to the hospital.

(Reporting by Ahmed Tolba; Editing by Kim Coghill) ((eric.knecht@thomsonreuters.com; +20 2 2394 8102; Reuters Messaging: eric.knecht.thomsonreuters.com@reuters.net))