Where can I find my lab requisition number? February 27, 2020 16:25 Your lab requisition number will be emailed to the email address you provide. Please bring your requisition number with you. Related articles Does my lab requisition number expire? How do I contact Labcorp OnDemand®? Where do I go for testing? Do I need to make an appointment? When can I visit a Labcorp location for sample collection?