She had been forced to leave Parliament House hours into the first sitting day in months, after being linked to a coronavirus contact tracing site. But on Monday night she revealed she'd got the all clear.

Earlier, the Labor politician tweeted that she was "one step removed" from someone who was at a site linked to the virus last week.

"To be cautious I have left the parliament and have had a COVID test. I'm self-isolating while I wait for the result," she said.

Politicians from Queensland were not required to isolate before coming to Canberra, but must quarantine for two weeks upon returning home.

Parliament House is on a heightened state of alert, as MPs from across the country converge for the first sitting day since June.

Building occupants have been asked to wear masks in common areas at the request of the acting chief medical officer.

Parliament House staff were handing out mask packs as people entered the building on Monday morning.

Senators and Lower House MPs unable to attend parliament in person are able to participate for the first time via videolink from their electorate offices.

Large television screens in the House of Representatives and Senate chambers show parliamentarians dialling in remotely.

Greens senator Larissa Waters made history by becoming the first senator to address the parliament by video on Monday morning.

However members cannot vote if they are not physically present in Parliament.