Google says it has fixed a "temporary issue" that saw ads for Australian abortion clinics blocked for more than a week.

Key points: Abortion clinics say their paid ads were blocked by Google for more than a week

Abortion clinics say their paid ads were blocked by Google for more than a week The internet giant said the "temporary issue" has now been fixed

The internet giant said the "temporary issue" has now been fixed Experts say there is a lack of transparency around digital platforms

Providers said they are dependent on Google advertising and told the ABC website traffic and bookings dropped more than 50 per cent after the ads were blocked.

Cigdem Cimenbicer, who runs the Macquarie Street Abortion Clinic in Sydney with her husband, noticed a drop off in enquiries last week and soon realised it was because her paid ads on Google were not showing.

"They (Google) just basically brushed it off and said, 'ma'am all your ads are fine, everything's okay, it's approved, there's nothing we can do' — and that was it," Ms Cimenbicer said.

"Then I started looking to see if I can see other clinics' ads were being published, and no they weren't."

When the ads were pulled Ms Cimenbicer said bookings had essentially stopped.

Several Australian abortion clinics that have complained about the issue. ( ABC News: Ben Sveen )

"Our bookings are down, our phones are not ringing, the only people who can find us are people who know about our clinic," she said.

"This is basically censoring anything to do with abortion termination.

"Everyone uses Google Ads.

"If you want plastic surgery, if you want extra boobs you can go and find a clinic, but not if you want to terminate a pregnancy."

'Temporary issue'

The ABC knows of several abortion clinics which raised the issue with Google since last week.

Google has provided a statement indicating there was a 'temporary issue' with advertising in Australia, and asserting that the problem has now been 'fixed'.

The ABC is awaiting further details from the company.

Family planning centre and abortion provider Marie Stopes said website traffic dropped by more than 50 per cent after its ads stopped appearing.

A phone operator working in the Marie Stopes call centre. ( Supplied: Marie Stopes Australia )

Jacquie O'Brien, the director of Public Affairs and Policy at Marie Stopes, said there had also been a drop in calls to the national support call centre.

"In a sector like abortion care where information is so difficult to find anyway, that has such a significant impact," Ms O'Brien said.

"Not just on organisations that are providing the service, but on people who are seeking information, proper information to try and access the service as well."

Information restricted

Ms O'Brien said Google is usually the first port of call for women facing an unexpected pregnancy.

"To block that information actually is really limiting to someone who is trying to find options for an abortion service or what to do when face with an unplanned pregnancy," she said.

"So if you have a decision by Google where they're going to start blocking or rejecting ads that are linking to bona fide websites, where you have information that is drawn from medical research, that's a huge issue."

Without an explanation from Google, Ms O'Brien said she can only speculate as to what could be behind the problem.

"What we believe has happened is there's been changes, in the UK, Ireland and USA around abortion advertising, and Australia seems to be swept up in that," she said.

Those changes came into effect this month and require abortion providers to be certified before their ads can be shown.

Lack of transparency

Research Fellow at the University of Technology Sydney Dr Sacha Molitorisz said it is possible those changes have affected the algorithm that determines what ads are shown.

Dr Sacha Molitorisz says there is a lack of transparency around Google algorithms for advertising and news. ( ABC TV: The Drum )

"Really only Google knows, I can't give any definitive pronouncements about what's going on," Dr Molitorisz said.

"I guess part of the issue when it comes to Google, Facebook the major digital platforms is that there's a serious lack of transparency."

That has been a point of frustration for Ms Cimenbicer.

"My main concern is how much power a search engine has in Australia, they're a law on their own," she said.

"They can do whatever they want, ban whatever they want and don't have to answer to anyone."

Algorithm regulator?

Australia's consumer watchdog the ACCC has recommended in a preliminary report into digital platforms that a regulatory body be set up to oversee algorithms for advertising and news.

"The suggestion isn't that algorithms be rendered completely transparent, more that a regulator has some sort of oversight and access into the workings of these algorithms, and this is really contested," Dr Molitorisz said.

"This is something Google and Facebook have pushed back against really hard — this is the one recommendation they seem particularly offended about."

Ms O'Brien said for now providers like Marie Stopes have no way of resolving their advertisements being blocked.

"Unfortunately this is just another incident where Google's made a decision but there's no ability for providers like ourselves and many others to speak directly to Google and say, 'this is actually the implication of what you've done, how can we solve this?'" she said.