"Former PM Nawaz Sharif, critically unwell, is fighting the battle for his life," said Adnan Khan, the Sharif family's personal physician.
"I have never seen him in such an alarming condition. We may lose him," said Nawaz's personal physician present at Islamabad High Court hearing.
Earlier in the day, the high court suspended his sentence for eight weeks and granted him bail in a corruption case.
The court said, two surety bonds of Rs 20 lakh each would have to be submitted to secure Nawaz's release. For an extension in bail, the Punjab government should be approached, it added.
During the hearing, the court asked doctors, part of the medical board overseeing Nawaz's treatment, whether it was possible for Nawaz to recover without staying in the hospital. The doctors replied in negative and said the PML-N leader required 24-hour medical supervision.
The doctors informed the court Nawaz had been given 80 injections to bring to normal his platelet count, which was reported to have dropped to dangerous levels. Doctors said Nawaz also suffered heart attack during the treatment.
Sharif's lawyer Khawaja Haris expressed dissatisfaction with the medical care provided to him.
"We are not satisfied with the medical board's treatment. The board has said in its report that it's unable to manage the treatment. Services hospital doesn't have machinery to conduct tests. Sharif has to be taken to different places for tests."
( With inputs from IANS )