On Jul. 25, 2020, LabCorp announced it received an Emergency Use Authorization from the FDA permitting diagnostic testing of groups of individuals for active COVID-19 infections utilizing matrixed pooled testing, a method that tests several patient samples at once.

LabCorp’s unique matrixed pooled strategy for COVID-19 provides an efficient testing approach for populations by allowing for larger groups of samples to be tested at one time. This methodology can quickly provide quality test results for individuals within the group, without requiring retesting in the majority of cases. Pooled testing may be used for populations at low risk of COVID-19, when testing demand exceeds laboratory capacity, or when testing reagents are in short supply.

LabCorp’s matrixed pooled testing method involves testing up to five samples at once. If there is a positive sample in the pool, LabCorp can identify the individual positive sample in the pool using patterns detected by its robotic testing platform. Pooled testing can reduce the number of tests required in specific populations, optimize laboratory testing supplies, and increase testing capacity.

LabCorp received the EUA from the FDA on July 24 for the qualitative detection of nucleic acid from SARS-CoV-2 in upper and lower respiratory specimens from individuals suspected of COVID-19, using a matrix pooling strategy (i.e., group pooling strategy), containing up to five individual upper respiratory swab specimens (nasopharyngeal, mid-turbinate, anterior nares or oropharyngeal swabs) per pool and 25 specimens per matrix, where each specimen is collected under observation or by a healthcare provider using individual vials containing transport media. Negative results from pooled testing should not be treated as definitive. If a patient’s clinical signs and symptoms are inconsistent with a negative result or results are necessary for patient management, then the patient should be considered for individual testing. Specimens included in pools where the positive sample cannot be identified using the matrix must be tested individually prior to reporting a result. Specimens with low viral loads may not be detected in sample pools due to decreased sensitivity of pooled testing.

LabCorp’s COVID-19 molecular test has been authorized by the FDA under an EUA only for the detection of nucleic acid from SARS-CoV-2, and not for any other viruses or pathogens, and has not been FDA cleared or approved. The test is only authorized for the duration of the declaration that circumstances exist justifying the authorization of emergency use of in vitro diagnostic tests for detection and/or diagnosis of COVID-19 under Section 564(b)(1) of the Act, 21 U.S.C. § 360bbb-3(b)(1), unless the authorization is terminated or revoked sooner.