It's feasible. If someone never exercised before passing a home test, and then worked out Richard Simmons style before the lab test. Or, if a person was submitted to a lab test with 15 ng/ml cutoffs, which is extremely rare, unless your name is Travis Henry and you play in the NFL.

My suggestion, get a few more home tests, test yourself on a few more occasions, and then you will be able to know for sure. But 9 times out of 10, the test you take at home, is pretty identical to the one they use in the lab.