I'm sorry - maybe I should have been more specific. At this point, I'm only really interested in doing the test through one specific laboratory - for a number of reasons. This particular lab requires a doctor's order.
Whatever the test reveals, I plan to supplement anyway - especially since these tests are known to yield "false negatives". It's just important to me to have, if possible, some laboratory "proof" of any possible pyroluria. Although it's possible to test negative even if I have it - if I actually test positive, it would give me at least some of the concrete answers I've been looking for for a long time. To have that concrete "missing piece of the puzzle" would be very valuable to me.