Codes indicating COVID-19 antigen test negative (1 of 7 possible types of CTV3 codes that contain information related to COVID-19)
Search of TPP CTV3 codes for terms relating to coronavirus, with additional (manual) check for any missing terms against the SNOMED list of COVID-19 related codes. Classification as "antigen test negative" was then performed following review of terms by six OpenSAFELY team members (including epidemiologists, clinicians, statisticians and infectious disease modellers).
This definition has been computed by taking the manually created full codelist and converting it to a list of rules that define the codelist.
|Y20d2||SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2) RNA (ribonucleic acid) detection result negative|
|Y22a2||Coronavirus disease 19 caused by severe acute respiratory syndrome coronavirus 2 excluded by laboratory test (situation)|
|Y23f4||SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2) detection result negative|