Hospital visit for ill Xenophon

Independent senator Nick Xenophon has been released from hospital where he was taken for tests after feeling unwell at Parliament House.

After arriving at work today, Senator Xenophon started feeling "uncomfortable" during a mid-morning meeting, his spokesman said.

The nature of his complaint was not revealed.

"He has been released and is currently taking some time to rest," the spokesman said.

The South Australian, who sits on the crossbench, faces a heavy workload this week with the upper house ordered to sit for extended hours until it deals with priority legislation, including a bill to scrap the carbon tax.

"He is expected to be back (at work) this week," the spokesman said.