Navalny team member Maria Pevchikh posted the results on X on Monday, saying the document had been released with the permission of the Navalny family and with the aim of pre-empting a possible official presentation being billed by Russian state media as a "sensation".
The 270-page forensic examination was drawn up in mid-2024 and had been in the possession of Navalny's relatives for the past 18 months.
"Its content fails to meet any ethical standards, not even the most minimal ones," Pevchikh alleged.
The Russian authorities have long maintained the opposition leader died of natural causes at the age of 47 on February 16, 2024.
His family and his team say that he was murdered on the orders of President Vladimir Putin.
On the second anniversary of his death, his widow Yulia Navalnaya and German Foreign Minister Johann Wadephul announced on the sidelines of the Munich Security Conference that Navalny had been poisoned with a powerful nerve poison.
They referred to laboratory results showing poisoning with a toxin known from South American dart frogs, without presenting the laboratory reports.
Russia has rejected the allegations of the family and Western politicians and has notified its objections to the Organisation for the Prohibition of Chemical Weapons.
It also rejects allegations of poisoning Navalny with the Novichok nerve agent in 2022, from which he recovered.
Pevchikh dismissed the official Russian position.
"The poisoning of Alexei Navalny has been confirmed by the several foreign laboratories that have investigated samples of his biomaterial taken out of Russia," she said.
"Even the name of the toxin has been given - epibatidine", she said, adding that the official Russian report was "sterile and redacted".
The family had nevertheless decided to publish the autopsy report to respond to the need for information on the part of millions of the late dissident's supporters, she said.
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