A coroner has amended her finding regarding the death of Christchurch man John MacDonald, who died from "severe blood loss"after a motorcycle accident in December 2009.

He had been taking part in a clinical trial for blood thinning drug rivaroxaban.

In her finding, Coroner Sue Johnson initially referred to the man wearing a medic alert bracelet.

This has since been amended to "bracelet", which was given to him as a trial participant.

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During Mr MacDonald's medical treatment, an emergency department registrar phoned the emergency number on the bracelet but there was no answer and emergency department staff did not see a wallet card with alternative numbers, the finding said.