Does my COVID-19 PCR Test (Labcorp Visit) order expire? November 22, 2021 13:00 Updated Your requisition number is valid for 6 months from the date it was generated. Related articles Can I drop off my completed Pixel by Labcorp® COVID-19 At-Home Collection kit at a Labcorp Patient Service Center? Does my lab requisition number expire? How do I contact Labcorp OnDemand®? Is fasting required for COVID-19 testing? How does the Pixel by Labcorp® COVID-19 process work?