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ROME — Pope Francis was in critical but stable condition Tuesday, with his blood parameters remaining stable and no new respiratory crises, as he worked from the hospital while battling double pneumonia, the Vatican said.

The Vatican’s evening update said the 88-year-old pope underwent a follow-up CAT scan in Tuesday evening to check the lung infection. But it provided no details of what the scan showed, suggesting the results weren’t back yet. Doctors said regardless he hadn’t had any further respiratory crises, and that his prognosis remained guarded.

“In the morning, after receiving the Eucharist, he resumed work activities,” the Vatican statement said.