Liberal leader Tony Abbott won't commit to making IVF treatments more affordable, saying he can't afford to "undo the damage" inflicted by Labor.
Government changes, introduced at the start of 2010, put a cap on the Medicare safety net rebate, adding thousands to the cost of IVF treatments.
Mr Abbott on Friday could not commit either way to retaining or dumping the rebate cap.
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"I am in the fiscal position that we currently find ourselves, not promising to undo the damage - I can't," he told reporters in outer Melbourne.
But parents lumped with higher out-of-pocket expenses or those priced out of IVF serves knew who to blame, he said.
"Blame the Labor Party, because this is their broken promise."
