A review has revealed another 7000 cases have been impacted by a DNA testing bungle at Queensland's beleaguered state-run forensic lab.
Queensland's opposition has called for a commission of Inquiry to be reopened after the number of cases involved grew to almost 40,000.
Queensland Police reviewed cases that may have been impacted following a damning inquiry into the state's forensic testing regime, which found many DNA samples went untested and the lab incorrectly ruled others "insufficient".
The forensic lab was scrambling to hire more scientists to handle a massive backlog involving more than 30,000 confirmed cases.
However, a post-inquiry review of cases dating back to 2007 by Queensland Police found another 7000 were impacted, taking the total to 37,000.
The review included samples acquired under a DNA extraction method, Project 13.
"The Queensland Police Service has advised Queensland Health that a review of records revealed there are approximately 7000 additional cases as a result of Project 13," a Queensland Health spokesperson told AAP on Wednesday.
"Queensland Health has previously advised it will review all serious cases back to 2007, including those affected under Project 13, bringing the total number of cases to be reviewed to about 37,000."
Opposition health spokeswoman Ros Bates said an internal review would be insufficient.
"At least 37,000 cases are now under a cloud due to the DNA lab failures, but there may be many more," she said in a statement.
"Only a commission of inquiry can get to the bottom of just how many additional cases have been impacted by these failures.
"The failings must be brought into the light, the truth must be exposed so these failings are never allowed to occur again."
Problems at Queensland's Forensic and Scientific Services lab were first raised in 2021 and eventually led to the inquiry headed by Walter Sofronoff KC.
The four-month review found failures to properly test samples for years due to "grave maladministration involving dishonesty".
The inquiry revealed lab managers focused on speed rather than accuracy to the detriment of quality science.
The scientist in charge of the state-run lab - Cathie Allen - was sacked in May after being stood down since the scathing inquiry into the lab practices that compromised thousands of criminal cases.
