如何翻译？

Ultrasound in all patients with suspected GCA has been reported as cost-effective compared with biopsy plus clinical judgement alone with a net monetary benefit of £485 (€~550/US$~600) per patient.

据报道，与仅进行活检和临床判断相比，在所有疑似GCA患者中超声检查均具有成本效益，每位患者的净金钱收益为485英镑（约550欧元/ 600美元）。

问题

1、biopsy plus clinical judgement alone，既然是‘’活检和临床判断‘’，为什么又说 alone

2、是节省£485，还是花费是£485