Scaramella, who returned to London to undergo tests and talk with the police on Tuesday, said he is under security protection and refused to say where he was.
More than three dozen staff at the two hospitals that treated Litvinenko will be tested for radioactive contamination, Britain's Health Protection Agency said earlier on Wednesday.
A coroner will perform an autopsy on Litvinenko tomorrow, "subject to appropriate precautions," in a bid to pin down the cause and circumstances of the death, said the local authority responsible, Camden Council.
Doctors had sought expert advice on whether Litvinenko's radioactive body could pose a threat to those performing the post-mortem.
A coroner's inquest was due to be opened yesterday and then adjourned until the police investigation is complete, the council said.
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