The only conclusion I can come up with is you diluted yourself to much with the home test to have it come up negative and did not use your first void of the day for an accurate reading, and for the lab test did not do any minor dilution for the lab test for example drinking a couple of gatorades and pissing 1-2 times before the test and pissing midstream. Those home tests are real accurate and I hope you are not just trying to scare people for the hell of it.