Autopsies on those killed during the battle between red shirts protesters and soldiers on the weekend start at the Forensic Institute, Police Hospital on Monday.
The result will be concluded and released for public at about 2pm.
The government has ordered the autopsy on the bodies to find the cause of the deaths.
The autopsy was conducted by an independent panel comprising doctors from many hospitals and representatives from the red shirts side.
Police spokesman Pol Lt Gen Pongsathat Pongcharoen told reporters that as the bodies of those killed in the clash are still in the hospital, it is likely that the red shirts would parade empty coffins around the capital on Monday.
Some 21 people were killed and 858 others injured in violent clashes between soldiers and redshirt demonstrators on Saturday night, a government medical service centre said.
Bangkok's Erawan Centre announced a further death yesterday evening after an earlier Public Health Ministry announcement which reported 20 deaths, five of whom were soldiers.
At Armyrun Phra Mongkul Hospital, 30 soldiers were being treated for critical wounds. They included four in a "worrying condition", senior officer Col Pheeraphol Pokpong said.
A total of 216 soldiers sustained injuries in clashes with red shirts at various locations in Bangkok. Around 100 of them were discharged after receiving treatment.
The bodies of 10 of the dead were at Central Hospital, including that of a Japanese photographer shot in the abdomen. The police forensic service is due to do autopsies on these.
