Health Ministry officials are warning that creating an organ donor register could be a cultural and logistical nightmare.

Parliament's Health Select Committee has been briefed on the issue.

Options for a formal register are being considered.

Chief medical adviser Colin Feek says the Ministry is using focus groups, submissions, and looking at international models.

Forty-four percent of New Zealanders tick the organ donor box on their driver licence, but there were just 33 donors last year.

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