Thrombocytopenia is a condition that occurs when the platelet count in the blood is too low, which can cause trouble stopping bleeding.
“However, some blood tests demonstrate an initial, mild renal failure, currently under control,” the statement said.
“The complexity of the clinical picture and the need to wait for the pharmacological treatments to have some feedback mean that the prognosis remains reserved.”
The Vatican said the pope took part in mass on Sunday morning in his papal suite on the 10th floor of Rome’s Gemelli Hospital, alongside those looking after him.
Francis, who has been head of the worldwide Catholic Church since 2013, was admitted on February 14.
He was initially diagnosed with bronchitis but it developed into double pneumonia, and on Saturday the Pope suffered a prolonged respiratory attack.
– Agence France-Presse