Berlusconi, 86, left San Raffaele Hospital last month after six weeks of treatment for a lung infection linked to a chronic myelomonocytic leukaemia, a type of cancer that affects the white blood cells.
"Silvio Berlusconi is currently at the San Raffaele Hospital to undergo scheduled tests in connection with his known hematological pathology," the San Raffaele hospital bulletin signed by doctors Alberto Zangrillo and Fabio Ciceri said.
Berlusconi served as prime minister in 1994-1995, 2001-2006 and 2008-2011 and although he does not have a direct role in government, his Forza Italia party is a member of Prime Minister Giorgia Meloni's right-wing coalition.
A source from Forza Italia said Berlusconi might spend the night in hospital, after local media reports that he would stay there overnight.
"Come on, Silvio," Deputy Prime Minister Matteo Salvini, one of Berlusconi's main political allies, wrote in an Instagram post, commenting on the news of Berlusconi's hospitalisation.
Persons:
Silvio Berlusconi, Berlusconi, Alberto Zangrillo, Fabio Ciceri, Giorgia Meloni's, Matteo Salvini, Berlusconi's, Salvini, Angelo Amante, Emilio Parodi, Federico Maccioni, Stefano Bernabei, Toby Chopra, Nick Macfie, William Maclean
Organizations:
MILAN, Italian, San Raffaele, Forza Italia, Saturday, Salvini's League, Thomson
Locations:
Milan, Raffaele