Lortab pills can be detected in the body according to when the last dose was taken. These are According to the studies, how long does it stay in the body? Urine: it may still be detected in urine for 2–4 days after the last dose. it doesn't stay in the blood for very long, therefore, drug tests can only identify its usage within about 24 hours. Saliva: It might take up to 48 hours for Lortab to show up in a person's saliva. Hair: Drugs can remain in hair follicles for a long time. Drug tests can identify some drugs, including Lortab, for up to 90 days after someone has stopped using them.