A move to give women access to surgical abortions in Tasmania's public hospital system will likely hinge on the vote of rogue Liberal Speaker Sue Hickey.
The unity of the state's Liberal party will be put to the test on Wednesday when the Labor opposition moves a motion calling on the government to provide access to public-system abortions by July 1.
Ms Hickey last month blindsided her own party when she voted with Labor and the Greens on the first day of the new parliament to make herself Speaker of the state's lower house.
The Liberals were re-elected in March with 13 House of Assembly seats, to Labor's 10 and the Greens two.
Ms Hickey has previously promised confidence in the government but also said she plans to consider bills on their merits.
Her vote is crucial in passing legislation if Labor and the Greens vote together.
Abortion was a key issue in the lead up to the election, after Tasmania's only dedicated surgical abortion clinic in Hobart closed several months ago.
The Liberals ruled out funding surgical abortions through the state's health system during the campaign and have offered assistance for women to travel to the mainland for abortions.
Opposition Leader Rebecca White told parliament on Tuesday as many as ten women a week are flying to Melbourne for the procedure.
"We have an opportunity as a parliament to provide better access for Tasmanian women and that's why we'll be moving this motion for debate," Ms White said.
Ms White described Ms Hickey as a supporter of women's health issues.
"Tomorrow will be a very interesting test of the government, particularly the premier, as to whether or not he has listened to Tasmanian women who have been telling him clearly that the current situation is unacceptable," Ms White added.
Greens leader Cassy O'Connor said she and fellow Greens MP Rosalie Woodruff would "absolutely" support Labor.
"That is our position that women in Tasmania should be able to access safe, affordable terminations in the public system," Ms Connor told reporters.
Ms Hickey has been contacted for comment.
The Greens also plan to move a motion to put a hold on new short-stay accommodation listings in Hobart, including Airbnb, as the city grapples with a housing shortage.