The ex-raise is prosecuted for complicity in the deaths of some 840 demonstrators in the suppression of popular uprising that forced him from power on February 11.
Egyptian television aired footage of Mubarak, 83, covered with a green blanket and lying on a hospital stretcher while being transferred from a helicopter into an ambulance for the short journey to the court.
The former president is under arrest in hospital since April, and his trial began in August, disrupted by frequent disturbances. At the last hearing in September, Marshal Hussein Tantawi, who heads the military council in charge since the fall of Mubarak, had testified in camera.
The marshal, who was the minister of defense of Mubarak for two decades, is considered the best position to testify on the central question of whether or not Mubarak ordered the use of force against demonstrators.
Judged with Mubarak and subject to the same charges, found his former Interior Minister Habib el-Adly and six other former senior security organs. Mubarak and his two son, Gamal and Alaa, are also charged with corruption.