valeur d’antériorité



This is contained in a document about blood and urine sampling. The following types of reports are produced by the laboratory:

un rapport d’analyses avec une valeur d’antériorité - an analysis report with a [...] value
rapport avec 7 dossiers d’antériorité - report with 7 [...] files

I can't figure out antériorité in this context. Maybe something to do with priority?

Any input greatly appreciated. Thanks in advance.