Accompanied by her daughter Priyanka, she left this afternoon. Her son and party Vice President Rahul Gandhi is staying back.
Party general secretary Janardan Dwivedi said that Gandhi had gone for regular check up that happens after every six months.
He said that her check up was due since her last visit abroad in September 2012 but it was delayed due to pressing engagements.
"It was overdue. It has to be done after her last check up in September last year. She left this afternoon and will be back in a week or eight days," Dwivedi said.
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The Congress President was admitted to AIIMS last Monday after she complained of chest pain and exhaustion in the Lok Sabha during a discussion on Food Security Bill when it was in the last stages of adoption.
She was discharged from the hospital after she spent five hours undergoing various tests. Gandhi, who had cough and headache, had felt uneasy in Parliament after taking medicines.
Sources in the party, however, denied any link between her visit to AIIMS and her check-up abroad.
"She was perfectly fine when she was was released after some tests in the AIIMS," the leader said.