Does tremadol come up as a opiate in urine test?

Tramadol will not show up as anything on a urine drug test. I have taken tramadol many, many times while also getting drug tested several times weekly. It does not show up on a lab test either, unless the tester specifically writes in that they want the urine tested for tramadol. It is not an opiate. Therefore, it would make sense that it would not show up on a swab test either.