Will lortabs show up in blood test a week after taking them for last month

Will lortabs show up in blood test a week after taking them for last monthTake tylenol 3 when I run Out I take lortabs

The main problem with Lortab (acetaminophen & hydrocodone) is that it is often undetectable in those prescribed the medication even within the same day.

It is very unlikely that it could be detected after one week.

What is the purpose of the blood test? Hydrocodone requires a specific test.