PKU Test Results

Just received my baby’s PKU results and it came back with a result of FAX. The FA is the normal result but the X is coming back as an unknown. The doctor explained that it’s likely nothing to worry about but to see what the 2 week test result is and if it is FAX also, then come back at 6 months to check for anemia.

Has anyone had these results? If so, what did it end up being?