“…All studies used the presence of 2’FL as an indicator of secretor status as a phenotypic indicator of secretor status. Although identifying 2’FL in HM is feasible and the required technology is becoming more accessible through point-of-care testing [ 121 ], there remain many scenarios where genetic information is used to determine secretor status. In these instances, there may be added value to distinguishing between heterozygous and homozygous secretors because differences may exist for some HMOs between heterozygous and homozygous secretors.…”