Racing Queensland's chief integrity officer Wade Birch is weighing up whether to release the details of cobalt tests expected soon from a Perth laboratory.

RQ sent a batch of swabs which date back to the winter carnival of which nine were identified as needing further testing.

Three have already been found to be under the 200 micrograms per litre of urine threshold which is allowable under the new rule.

The results of swabs being examined in Western Australia were expected to be made available to RQ officials on Friday but have been delayed until at least the middle of the week.

If samples from the Perth laboratory fail the threshold a B sample is retested at another facility.

"I have to make a decision whether the results should be made public after they return from Perth or after the final tests in Sydney or Hong Kong," Birch said.

"It is a case of weighing public interest against the interests of trainers and owners. We have to get the balance correct and I have sought advise from some of the best brains around."

The delay follows a high volume of samples sent to the ChemCentre in Perth with tests that usually take two days taking up to seven.

NSW trainer Darren Smith is the subject of a cobalt inquiry while Victorian stewards are continuing an investigation into higher than allowable limits found in horses from the high-profile stables of Peter Moody, Mark Kavanagh and Danny O'Brien.