Table 1.

Blood test plan for the pilot study

Age band	All practices (5–6 practices) during the study period
	100 sample threshold crossed after the following number of weeks	150 sample threshold crossed after the following number of weeks
18–29	3	5
30–39	3	5
40–49	2	2
50–59	1	2
60–69	1	2
70+	1	1

This table represents the week in which sample collection would be complete, if all patients consented. The pilot study will take place as soon as ethical approval is achieved and would involve the collection of a total of up to 150 samples from approximately six practices over the study period.