西門子的抗體有index value，便於比較

可以去抽血測抗體。跟你的家庭醫生說要測抗體  

這是西門子的測試  

Siemens Advia Centaur SARS-CoV-2 Total assay.

Antibody, anti-spike

proteinSARS-CoV-2 Total Antibody, anti-spike protein

會給出一個index value （如果是正數的話），便於比較。

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測試報告的一段：

Test performed using the Siemens Advia Centaur SARS-CoV-2 Total assay. This test has been approved for EUA by the FDA. Nonreactive results do not rule out SARS-CoV-2 infection, particularly in those who have been in very recent contact with the virus.