Apparently even if your results are normal range they can tell by the levels of shit. Having said that I think it depends on who looks at the results/ whether they know b/p is a possibility. X
Yes, like Lissy said, they have ways of telling.
The most likely indicator is your potassium level, I believe... the b/p lowers it significantly. However, if you've got till wednesday, it should stabilise. Particularly if you eat oranges/drink orange juice... that's my choice method of controlling potassium levels. xx