Microbial-origin diagnostic kits fall under Heading 30.02, excluding classification as laboratory reagents under Heading 38.22.

Diagnostic kits for AIDS, Hepatitis B and Hepatitis C were treated as classifiable under Heading 30.02 because their essential diagnostic function arose from antigen-antibody reactions involving antigens or antibodies obtained from micro-organism cultures. Heading 38.22 applies only to diagnostic or laboratory reagents not otherwise covered by Chapter 30, so products falling within Heading 30.02 are excluded from Heading 38.22. On that basis, microbial-origin diagnostic kits were classified under Heading 30.02, and the contrary duty demand was unsustainable.

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Issues: Whether AIDS (HIV I and II), Hepatitis B, and Hepatitis C diagnostic kits were classifiable under Heading 30.02 of the Central Excise Tariff Act, 1985 or under Heading 38.22 of the Central Excise Tariff Act, 1985.

Analysis: The kits were found to contain antigens or antibodies obtained from cultures of micro-organisms, with the essential diagnostic function arising from antigen-antibody reaction. Heading 38.22 applies only to diagnostic or laboratory reagents not covered by Chapter 30, whereas Heading 30.02 covers vaccines, toxins, cultures of micro-organisms and similar products. Relying on the HSN notes and the understanding that diagnostic reagents of microbial origin fall within Heading 30.02, the kits were held to be classifiable under Heading 30.02. Once covered by Heading 30.02, classification under Heading 38.22 stood excluded.

Conclusion: The kits were correctly classifiable under Heading 30.02 and not under Heading 38.22, and the duty demand based on the contrary classification was unsustainable.

Ratio Decidendi: Diagnostic kits whose essential character is derived from microbial-origin antigens or antibodies and which operate on antigen-antibody reaction are classifiable under Heading 30.02, and cannot be brought under Heading 38.22 when Chapter 30 specifically covers such products.

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