Labor is leading the two-party preferred race in Liberal MP Andrew Nikolic's northern Tasmanian seat, according to a new ReachTel poll.

The survey of 824 residents across the electorate of Bass, conducted on Tuesday, found Mr Nikolic received top billing with 44.1 per cent of first preference votes.

But on a two-party preferred basis Labor candidate Ross Hart tipped the scales with a narrow margin: 51 per cent to 49 per cent.

The poll, commissioned by lobby group GetUp!, focused on health services spending.

A majority of respondents backed Labor as better placed to manage health services, except those aged over 65 who gave the Liberal Party their support.

Former Army brigadier Mr Nikolic is serving his first term in Bass which he won in 2013 with a four per cent margin.