Former South African President Nelson Mandela underwent a diagnostic procedure in a Johannesburg hospital on Saturday for what is described as a “long-standing abdominal complaint.”

The country's president, Jacob Zuma, reported in a statement that the 93-year-old anti-apartheid icon was in no danger and is expected to leave the hospital Sunday or Monday.

Using Mr. Mandela's affectionate clan name, Mr. Zuma's statement read, “Madiba is fine and fully conscious and the doctors are satisfied with his condition.”

Earlier the president expressed get-well wishes from the South African people and also requested the public respect the privacy of Mr. Mandela and his family.

Mr. Mandela, winner of the Nobel Peace Prize, was hospitalized a year ago. He has not appeared in public since then.

Nelson Mandela was imprisoned for 27 years until he was freed in 1990. Four years later he became South Africa's first black president, bringing an end to the country's era of apartheid – all-white rule.