ROME (AP) — Pope Francis remained in critical but stable condition Tuesday, with his blood parameters remaining stable as he works from the hospital while battling double pneumonia, the Vatican said.

Pope Francis, battling double pneumonia, remains in critical condition for the fourth day running but is stable and has not had any further respiratory crises, the Vatican said on Tuesday. The 88-year-old pope was spending his 12th night at Rome's Gemelli hospital,

The Vatican’s evening update said the 88-year-old pope had had no new respiratory crises and that his blood parameters were stable. He underwent a follow-up CAT scan Tuesday evening to check the lung infection, but no results were provided. Doctors said his prognosis remained guarded.