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Table 2 RT-LAMP results testing 466 clinical samples stratified by Ct values

From: Essential properties and pitfalls of colorimetric Reverse Transcription Loop-mediated Isothermal Amplification as a point-of-care test for SARS-CoV-2 diagnosis

  Positive Positive Negative
Low viral load
Ct < 30 Ct 30–35 Ct > 35
RTq-PCR
 Positive 93.8% 28.6% 5.2%
n = 150 n = 16 n = 13
 Negative 0.6% 39.3% 90.4%
n = 1 n = 22 n = 226
RT-LAMP
 Intermediate 5.6% 32.1% 4.4%
n = 9 n = 18 n = 11
 Total 34.3% 12.0% 53.6%
n = 160 n = 56 n = 250