XDx, the startup behind a test measuring gene activity in the blood, is raising an additional $35.4 million in its fifth round of funding, according to VentureWire.

The Brisbane, Calif. company filed for an IPO of up to $86.3 million back in October, but has reportedly made a filing with the Securities and Exchange Commission saying it's raising a fifth round of up to $61 million. It's not clear who the new backers are.

The company received $25.6 million in the first part of this venture round back in May 2007.