Are there any limitations to COVID-19 antibody tests?

False negative results can sometimes occur. This can happen if you get an antibody test too soon after being exposed or vaccinated and your body has not yet made enough antibodies to be detected by the test. Additionally, some individuals, such as those with weakened immune systems due to a medical condition or certain medications, may not develop detectable levels of antibodies after exposure or vaccination.

False positive results can also occur. This can happen if the test detects antibodies from other coronaviruses you may have been exposed to, like the virus that causes the common cold. 

If you are concerned about your results, it is important to follow up with a healthcare provider, who can evaluate your medical history.