I have an unused COVID-19 test. Can I still register it? March 20, 2023 11:16 Updated Yes, you will be able to register a COVID-19 test that was purchased through your OnDemand account. Related articles How do I return my kit? How do I contact Labcorp OnDemand®? I have purchased a test but haven’t gone to a Labcorp PSC yet for specimen collection. Can I still take this test? Does it matter how much sample I add to a Prop? How do I register my kit?