Hours after his wife was found dead, the 57-year-old Union Minister of State for Human Resources was admitted to AIIMS after complaining of chest pain.
Sudhir Gupta, Head of Forensic Sciences Department at AIIMS said the post-mortem is being videographed to ensure transparency in the procedure.
Pushkar was found dead in her suite at the Leela Palace hotel last evening and the body was shifted to AIIMS at around 3:30 AM for post-mortem.
Doctors said he was brought to the hospital with a "cardiac condition" but he is stable now.
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Continuing investigation, police questioned a number of hotel staff and checked the CCTV footage of the lobby of the third floor of the luxury hotel where she was staying.
Sources in police said call details record as well as Pushkar's tweets were being checked. Pushkar and Tharoor had checked into the hotel on Thursday as their home was being painted.
Pushkar and Tharoor were at the centre of a raging controversy when reports emerged that she was upset over reported text and tweet messages between her husband and Mehr Tarar, a Pakistani journalist.
Delhi Police spokesman Rajan Bhagat said inquest proceedings have been initiated by the sub-divisional magistrate of the area. Any death within seven years of marriage is legally required to be investigated by the sub-divisional magistrate.