Proportion of positive tests is helpful as it gives more information to help differentiate greater prevalence of c19 from greater testing when more positives are recorded. One of the main metrics used in the us I think
That applies to an LFT done at home but this is a PCR which was processed in a lab somewhere and presumably provides the results directly to the NHS.
Then they may not have faith in getting the data from the lab and would like a fall back option.
@jellybaby started
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Proportion of positive tests is helpful as it gives more information to help differentiate greater prevalence of c19 from greater testing when more positives are recorded. One of the main metrics used in the us I think