Standardisation of reference intervals: an Australasian view.

The development of regional databases and doctors' desktop programs that accept pathology results from different laboratories should improve patient care by allowing easy assessment of cumulative data. This has the potential to be unnecessarily confusing unless laboratories contributing to the databases provide standardised results and common reference intervals, where this is valid. The analytical methods that produce significantly different results need to be reported in a manner that avoids inappropriate interpretation. The process of setting reference intervals requires an organisational structure which enables appropriate intervals to be set taking all relevant factors into account, including the opinions of expert clinicians. There must also be criteria for analytical agreement between the laboratories involved based on comparison studies using patient samples.A network of QA groups across Australasia, with leadership from the AACB and RCPA, should be formed to share the ongoing work of defining reference intervals (RIs) for common tests, and reviewing them as the testing environment changes with the introduction of new techniques and instruments.