… Diagnostic or laboratory reagents on a backing, prepared diagnostic or laboratory reagents whether or not on a backing, whether or not put up in the form of kits, other than those of heading …
Explanatory notes
… prepared diagnostic or laboratory reagents whether or not on a backing, whether or not put up in the form of kits, … 38.22 shall take precedence over any other heading in the Nomenclature. The certified reference materials of this … : (a) Goods of headings 28.43 to 28.46 and 28.52 (see Note 1 to Section VI); (b) Products covered by Note 1 to …