Dear Waikato District Health Board,

1. Please provide all policy updates/changes to all thyroid test reference ranges (TSH, Free T3, RT3, thyroid anti-body etc.) recommended by Pathlab and approved by the Waikato DHB for implementation by Pathlab; and implemented by Pathlab, during the period 1st January 2010 to 20 July 2018; along with:

a) the rationale for these updates/changes and the citation list of the clinical publications supporting these changes/updates (clinical research studies and other clinical papers including guidelines referenced); plus

b) the associated ‘clinical updates’ for these changes/updates that have been posted in the clinicians information area of Pathlab's website; plus

c) Copies of reports of these updates/changes provided to the Waikato District Health Board by Pathlab or produced by the Waikato District Health Board, which monitor the impact of these updates/changes on patient's health and well-being.

2. For the period 1st January 2010 to 20th July 2019, copies of all correspondence associated with Waikato DHB and Pathlab approved updates/changes to thyroid testing policy (the thyroid tests themselves and reference ranges) with other NZ medical lab companies, the Royal Australasian College of Physicians (https://www.racp.edu.au/), Ministry of Health and https://bpac.org.nz/.

Yours faithfully,

Belinda Hodson