Update: The Senate has rejected an amendment to extend the opt-out period for a year, but has agreed to three months. The opt-out deadline is now January 31.

Labor will move another amendment to the My Health Record Act when it is debated in the Senate today to try to force a 12-month extension to the opt-out period, which is due to end tomorrow.

The move is likely to be successful following a non-binding motion in the Senate on Monday, which saw Labor, the Greens and the cross-bench support an extension by 35 votes to 22. However, the amended legislation will have to go back to the lower house, which isn't sitting until the week beginning November 26.