Hi there, I'm in a similar position and recently went to ENT who did an immediate biopsy and ultrasound the next day. I'd say it depends how big your lump is, mine is 3cm and anything above 1cm is considered abnormal. I'm not sure if blood results alone would confirm, I've had no bloods taken so far, and everything I've read has said you need further tests, like mine, to rule out. But if might be that if your lump was smaller there wasn't need for concern or more tests and that's why they've done bloods first.