...what? This seems like a very strange assertion to me.
LSD is obviously difficult to test for and is not typically part of a routine test at all.
But even if it is in this case, unless things have rapidly progressed in the past few years, I don't think it's possible to differentiate between different tryptamines (or even different indoles) in the blood, and even detecting them at all is difficult or impossible after 12 hours or so.
Are you saying that it's now possible, from a blood test, to make this differentiation? Do you have a source for this claim?
Unless another dose of the material is provided, I doubt that we'll know what this person ingested.