Johannesburg — While former president Nelson Mandela's condition remains critical but stable, at times it becomes unstable, the presidency said on Saturday.
"While at times, his condition becomes unstable, the doctors indicate that the former president has demonstrated great resilience and his condition tends to stabilise as a result of medical interventions," spokesman Mac Maharaj said in a statement.
He said doctors were working hard to effect a turnaround, improve Mandela's health and to keep him comfortable.
"President Jacob Zuma urges South Africa to continue praying for Madiba and to keep him in their thoughts at all times," Maharaj said.
Zuma would be travelling to Malaysia on an official visit on Saturday.
The visit was aimed at boosting social, political and economic ties between the two countries.
Zuma would receive a Lifetime Award for Global Peace awarded to Mandela, on his behalf, by the Mahathir Global Peace Foundation.
Earlier this month, the presidency said Mandela's condition was still critical but steadily improving.
"The medical team also reiterated that although his health was improving steadily, Madiba still remained in a critical condition," Maharaj said at the time.
Mandela was spending his 78th day at the Medi-Clinic Heart hospital in Pretoria on Saturday.
The anti-apartheid icon was admitted on June 8 for a recurring lung infection.