Percocet is a combination medication containing oxycodone and acetaminophen. The length of time that Percocet stays in your system can depend on various factors such as age, weight, liver function, and frequency of use. Generally, oxycodone can be detected in urine for 1-4 days after use, in blood for up to 24 hours, and in saliva and hair for up to 90 days. Acetaminophen is usually metabolized quickly and does not accumulate in the body, so it is unlikely to be detected in drug tests. It’s important to note that drug testing methods and sensitivity can also affect the detection window.