西门子的抗体有index value，便于比较

可以去抽血测抗体。跟你的家庭医生说要测抗体  

这是西门子的测试  

Siemens Advia Centaur SARS-CoV-2 Total assay.

Antibody, anti-spike

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

会给出一个index value （如果是正数的话），便于比较。

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测试报告的一段：

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.