Are there any limitations to COVID-19 antibody tests?

Getting an antibody test too soon after being infected may cause a false negative result. Additionally, some individuals who are infected with COVID-19 may not develop detectable levels of IgG antibodies, such as those with weakened immune systems due to a medical condition or certain medications.
This test may detect IgG antibodies from previous exposure to coronaviruses other than COVID-19, which can cause a false positive result.

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