Judge Kevin Eide has recognised there may be some claims from people insisting they are the rightful heirs to the "Purple Rain" singer's fortune.
On Friday, the judge gave Bremer Trust officials, who are administrating the estate, permission to have samples of Prince's blood transferred from the Midwest Medical Examiner's office to DNA Diagnostics Center of Fairfield, Ohio, for testing.
The Carver County judge also gave anyone with an estate claim four months to file notice.
One major claim for over USD 750 billion has already been filed by a woman named Dr KK Ferraro in Atlanta, Georgia.
The judge dismissed an earlier USD 1 billion claim against the estate by a California man who said there was an "implied" agreement from Prince entitling him to the superstar's musical rights, both published and unpublished.