Central Health says the number of patients affected by discrepancies in interpretation of their mammography results has risen to four.

The health authority is conducting a review of some 3,000 mammograms viewed over the last three years after it was discovered that some of the viewing stations used do not meet national standards.

Central Health says as of August 26, the images of 837 patients had been reviewed, and four potential discrepancies or differing interpretations were detected.

Central Health is gathering information about the situation and is in the initial phases of an internal quality review.

Health Minister Tom Osborne can’t say how many viewing stations did not meet the standard.

He says Central Health has guaranteed that any new images will be read on 5 megapixels. The review will determine how many of the workstations were using 3 megapixels instead of 5. In the meantime, the main priority right now is getting the images re-read, says Osborne.