The Greens will push the South Australian parliament to endorse a move to help increase the availability of donated blood supplies.
The Therapeutic Goods Administration recently approved an application by the Australian Red Cross to reduce the waiting time for male blood donors who have had sex with men from 12 months to three months.
The three-month period would start from their last sexual contact.
Greens upper house MP Tammy Franks will ask parliament on Wednesday to vote on a motion to endorse the TGA's move.
"We know that blood does not have a long shelf life and that we always need blood and blood donors," she said.
"To continue to discriminate against groups, such as men who have had sex with men in the last 12 months, is not only stigmatising, it is not the best health practice."
One in three Australians would need blood or blood products in their lifetime and one blood donation could save up to three lives.
"Yet we continue to deny willing donors because of stigma, not science," Ms Franks said.
"It has to change and the government can change this now."
Australian Associated Press