Specimens
- Nasal/Throat swabs collected using BD dry swabs/Remel M4RT/Copan 321C UTM or Copan 147C / Citoswab or miraclean swabs.
- Samples should be taken from symptomatic patients between days 1–5 from onset of symptoms.
- Specimens should be sent to the laboratory at ambient temperature in Category B packaging and labelled as containing HIGH RISK specimen.
- For best results, please send samples on the day they are taken. However, samples are stable at ambient temperature for 7 days.
The assay
Infection with SARS-CoV-2, an RNA virus, is diagnosed using reverse-transcriptase real-time PCR. The assays used at TDL show a minimum sensitivity of 98% and a specificity of 100%, with no cross-reactivity with other viruses.
Image: CDC/ Alissa Eckert, MS; Dan Higgins, MAMS
Specimens
- SST/Serum
- Capillary self collection can be used for the Roche Elecsys Anti-SARS-CoV-2 S and Roche Elecsys Anti-SARS-CoV-2 assays.
- Testing should be undertaken 14 days or more following exposure, onset of symptoms, or post-vaccination.
- For best results, please send samples on the day they are taken. However, samples are stable at ambient temperature for 7 days.
The assays
TDL offers 4 assays for the detection of antibodies targeted against SARS-CoV-2:
- Roche Elecsys Anti-SARS-CoV-2 S (Spike) – spike protein, quantitative, total antibodies NEW
- Roche Elecsys Anti-SARS-CoV-2 – nucleocapsid (N) protein, qualitiative, total antibodies
- Abbott Architect SARS-CoV-2 IgG – nucleocapsid protein, qualitiative, IgG antibodies
- Abbott Architect SARS-CoV-2 IgM – spike protein, qualitiative, IgM antibodies
Background overviews of SARS-CoV-2 and COVID-19
- The virus
- Transmission
- Infection and symptoms
- Clinical characteristics
- Immune response
- Testing
- Sequalae
Contact us
To discuss these tests, please contact:
Annette Wilkinson, The Doctors Laboratory, The Halo Building,1 Mabledon Place, London WC1H 9AX
Tel: +44 (0)20 7307 7373 E-mail: tdl@tdlpathology.com
How TDL is helping the UK’s response to COVID-19
TDL has been testing for COVID-19 since the disease first emerged. The team has developed new detection methods, worked closely with hospitals and with those opening their own labs, and by January 2021 was processing more than 20,000 PCR tests a day.