Critical Care and Shock

The use of COVID-19 IgM rapid test in the setting of negative RT-PCR to diagnose infection by SARS-CoV-2: A challenging case


In December 2019, a novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) caused an outbreak of respiratory disease in Wuhan, China, that quickly spread to other countries causing a global pandemic. Although the reverse transcriptase polymerase chain reaction (RT-PCR) test for SARS-CoV-2 infection has become the standard method of diagnosis, this test has limitations that cause false negative results. The sudden onset, and spread of this virus, has created an urgency to find reliable screening and diagnostic tools to identify infected patients, prevent further transmission, and provide treatment for these patients. A rapid and accurate diagnostic tool, the COVID-19 combined IgG and IgM “Rapid” test can detect these antibodies against SARS-CoV-2 using a finger prick blood sample detecting infection in 15 minutes. We report the use of the COVID-19 IgM Rapid Test in the presence of high clinical suspicion, along with typical chest computed tomography findings suggestive of COVID-19 infection, in a patient who tested negative twice for the nasopharyngeal swab specimen RT-PCR test.