The Duo pack includes two tests and the Family pack includes three, at a lower price than buying them separately.
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Each test is registered separately, with a different account and email address. Once you have completed one registration, log out and repeat the process for the next person; if you have trouble logging out, use another browser or private browsing mode.
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Each person collects their sample following the instructions in their kit.
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All samples are sent together in the same bag. Each registration generates a label, but you only need to use one of them. In Spain, for Advanced or Ultra, wait until all prescriptions for the pack have been approved before sending the samples.
As the samples must be sent together, it is better to buy individual tests if the people taking them live in different places.