The laboratory, operated by healthcare company Salutaris People in partnership with Source BioScience and Test Assurance Group (TAG), can perform 500 tests a day, but can be increased in scale to facilitate up to 1,000.
Cliff Kirby, board director of TAG, said the company has "put passengers first" whenever there has been a change in legislation regarding testing requirements.
"We are incredibly proud to be working in partnership with Liverpool John Lennon airport to support their testing needs," he added.
