Pathlab update: FT3 reference intervals

In consultation with endocrinologists and paediatricians, Pathlab has recently updated reference intervals for FT3. This aligns Pathlab with Waikato Hospital Laboratory and LabPlus and includes more appropriate intervals for young paediatric patients. A summary is listed below.

These new reference intervals have been in effect from Thursday 5 March 2026. Results that fall outside the reference interval continue to be flagged. Please see the Pathlab website for a full list of reference intervals, including the updated FT3 intervals.