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Johannesburg - The presidency said on Sunday it was awaiting feedback from doctors before updating the public on former president Nelson Mandela's condition.
"I'm not bothering them [the doctors]. They will contact me when they are ready," spokesman Mac Maharaj said.
On Saturday afternoon, Mandela, 94, was admitted to a Pretoria hospital for a scheduled check-up. He spent Sunday night there.
"Doctors are conducting tests and have thus far indicated that there is no reason for any alarm," Maharaj said at the time.
He said the check-up was to manage existing conditions that came at his age.
In December Mandela underwent an operation to remove gallstones and to treat a recurring lung infection. He was discharged after an 18-day stay and placed under home-based high care at his Houghton, Johannesburg, residence.
In January, the presidency said Mandela had made a full recovery from the surgery and continued to improve.
South Africa's first black president has a long history of lung problems, dating back to the time when he was a political prisoner on Robben Island during apartheid.
While in jail he contracted tuberculosis. - Sapa
*This article was edited at 11:34 on Sunday 10 March, 2013