CDC’s Diagnostic Test for COVID-19 Only and Supplies
Summary of Recent Changes
In addition to this test, CDC has developed a diagnostic test that can be used to detect SARS-CoV-2, influenza A, and influenza B viruses at the same time. This test is called the CDC Influenza SARS-CoV-2 (Flu SC2) Multiplex Assay. More information is available at CDC’s Diagnostic Multiplex Assay for Flu and COVID-19 and Supplies.
The CDC 2019 Novel Coronavirus (2019-nCoV) Real-Time Reverse Transcriptase (RT)–PCR Diagnostic Panel detects the SARS-CoV-2 virus in upper and lower respiratory specimens. It is designed to be used with an existing RT-PCR testing instrument commonly used to test for seasonal influenza virus.
The U.S. Food and Drug Administration (FDA) gave Emergency Use Authorization (EUA) for this test on February 4, 2020. The diagnostic panel’s FDA-authorized Instructions for Useexternal icon contain information about the test, its intended use, the test procedure, and performance characteristics. The EUA websiteexternal icon has published the FDA Letter of Authorizationexternal icon for the diagnostic panel. The letter defines the authorized use and the conditions of authorization that apply to CDC and to testing laboratories that use this test.
On June 12, 2020, FDA granted an amendmentexternal icon to the EUA for the CDC diagnostic test to address global shortages of materials needed to perform the test. This amendment provides alternatives for processing the test:
- Four additional extraction reagents that can be used in the existing extraction methods
- An additional extraction instrument and associated reagents
- A new process that can be used in place of the extraction method when materials for the current method are limited
On July 13, 2020, FDA granted an amendmentexternal icon, to add the Promega Maxwell® RSC 48 as an authorized extraction instrument for use with the CDC 2019-nCoV rRT-PCR Diagnostic Panel.
On December 1, 2020, FDA authorized an amendmentexternal icon to add:
- The option to conduct pooled specimen testing for upper respiratory swab specimens
- Performance data generated with FDA’s reference panel
- Promega Maxwell® CSC 48 as a specimen extraction option
How to order the Real-Time Reverse Transcriptase (RT)-PCR Diagnostic Panel
The International Reagent Resource (IRR)external icon is distributing the diagnostic panel and supplies to registered state and local public health laboratories so they can perform SARS-CoV-2 testing.
During the SARS-CoV-2 pandemic, state public health laboratories can authorize county or city laboratories in each state to perform testing. These laboratories must be certified under the Clinical Laboratory Improvement Amendment (CLIA) to perform high-complexity tests, have appropriate laboratory equipment and training, and demonstrate testing proficiency under their state laboratory’s stewardship to maintain their status as an IRR-registered laboratory. The IRR does not supply clinicians, hospitals, or healthcare professionals with testing kits directly. Clinicians, hospitals, and healthcare professionals should refer to the list of commercially available lots of primers and probespdf icon that are acceptable alternatives to the CDC-provided reagents. The list begins on page 7 in the authorized CDC 2019-nCoV Real-Time RT-PCR Diagnostic Panel Instructions for Useexternal icon Package Insert.
Materials included in the diagnostic panel
CDC’s laboratory test kit for the SARS-CoV-2 virus.
The CDC 2019-nCoV Real-Time RT-PCR Diagnostic Panel contains four reagents:
- Three primer-probe mixes for:
- 2019-nCoV_N1: targets virus nucleocapsid (N) gene for specific detection of SARS-CoV-2
- 2019-nCoV_N2: targets virus nucleocapsid (N) gene for specific detection of SARS-CoV-2
- RP: targets human RNase P gene for detection of human nucleic acids; control for sample integrity
- nCoVPC: noninfectious positive control material; yields a positive result in each assay included in the panel
If the diagnostic panel is not available, see the updated instructions for useexternal icon for acceptable alternatives.
Other materials labs will need to perform the diagnostic panel
The CDC 2019-nCoV Real-Time RT-PCR Diagnostic Panel requires the use of additional authorized materials that are not included with the test. These materials include PCR reagents and items that are commonly used in clinical laboratories, such as a microfuge, microcentrifuge tubes, pipettes, and pipette tips. They are described starting on page 6 in the authorized CDC 2019-nCoV Real-Time RT-PCR Diagnostic Panel Instructions for Useexternal icon package insert. Two control materials are also required but not provided; these materials must produce expected results in order for a test to be considered valid, as outlined in the CDC 2019-nCoV Real-Time RT-PCR Diagnostic Panel Instructions for Useexternal icon. The controls are:
- Human Specimen Control (HSC): A human cell culture preparation used as an extraction procedural control to demonstrate successful recovery of nucleic acid, as well as extraction reagent integrity. Acceptable alternatives to HSC are listed in the package insert.
- No Template Control (NTC): Nuclease-free water included in each run. Monitors for reagent and system contamination.
More Resources on the CDC Diagnostic Panel
- List of Acceptable Commercial Primers and Probespdf icon
- Processing of Sputum Specimens for Nucleic Acid Extractionpdf icon
- Research Use Only RT-PCR Primers and Probes
Fact Sheets for CDC 2019-nCoV Real-Time RT-PCR Diagnostic Panel
More Resources for Diagnostic Testing