Jayalalithaa was admitted to the hospital on September 22, 2016 and died on December 5 that year.
The Madras High Court on Wednesday ordered Apollo Hospital to submit a report on the blood samples of late Tamil Nadu Chief Minister J Jayalalithaa by Thursday.
The court's order came as it heard a petition filed by S Amrutha, who claims to be Jayalalithaa's daughter.
It fixed the next hearing for June 4.
Jayalalithaa was admitted to the hospital on September 22, 2016 and died on December 5 that year.
Ms Amrutha had approached the High Court for an order for DNA test to prove that she was Jayalalithaa's daughter.
The court had asked Apollo Hospital to file a report as to whether it has the blood samples of Jayalalithaa.