Grrh. My own stupidity
I've been putting off gettiong blood work done for a few months now, so finally today I decided "Let's Do It".
The test was for fasting blood work and urine, and last time I was in I'd brought a urine collection bottle home, so that was not an issue.
I *thought* that clear liquids were fine, so had some black coffee (no sugar) before going.
Of course, i mentioned that on checking in only to get MAJORLY chastised and shown that it's even explicitly written on the form
Oh well; back to the lab tomorrow morning and I'm advised to get there when they open at 7:30 as Saturday is a busy day