CLA-2-38:OT:RR:NC:N3 135
Emil Bjurling
Mercodia AB
Sylveniusgatan 8A
Uppsala 75450
Sweden
RE: The tariff classification of diagnostic ELISA kits from Sweden
Dear Mr. Bjurling:
In your letter dated January 28, 2026, you requested a tariff classification ruling. Additional information was
provided via email dated February 12, 2026.
Mercodia Glucagon ELISA kit (10-1271-01) is a solid phase two-site enzyme immunoassay. It is based on
the direct sandwich technique in which two monoclonal antibodies are directed against separate antigenic
determinants on the glucagon molecule. During the first incubation glucagon in the sample reacts with
anti-glucagon antibodies bound to microplate wells. After washing, peroxidase conjugated anti-glucagon
antibodies are added. After a second incubation and a simple washing step, the bound conjugate is detected
by reaction with 3,3’,5,5’-tetramethylbenzidine (TMB). The reaction is stopped by adding acid to give a
colorimetric endpoint that is read spectrophotometrically. The kit is intended to measure the pancreatic
hormone glucagon in plasma and serum. Glucagon measurements are used in the diagnosis and treatment of
patients with various disorders of carbohydrate metabolism, including diabetes mellitus, hypoglycemia, and
hyperglycemia. The kit contains one coated plate (mouse monoclonal anti-glucagon), one vial each of
calibrators 1, 2, 3, 4, and 5 (synthetic glucagon), one vial of calibrator 0, one bottle of assay buffer, one bottle
of enzyme conjugate 11X, one bottle of enzyme conjugate buffer, one bottle of wash buffer 21X, one bottle
of substrate TMB, and one vial of stop solution.
Mercodia Mouse Insulin ELISA kit (10-1247-01) is a solid phase two-site enzyme immunoassay. It is based
on the direct sandwich technique in which two monoclonal antibodies are directed against separate antigenic
determinants on the insulin molecule. During incubation insulin in the sample reacts with
peroxidase-conjugated anti-insulin antibodies and anti-insulin antibodies bound to microplate wells. A simple
washing step removes unbound enzyme labeled antibody. The bound conjugate is detected by reaction with
3,3’,5,5’-tetramethylbenzidine. The reaction is stopped by adding acid to give a colorimetric endpoint that is
read spectrophotometrically. The kit provides a method for the quantitative determination of insulin in mouse
serum or plasma. The kit contains one coated plate (mouse monoclonal anti-insulin), one vial each of
calibrators 1, 2, 3, 4, and 5 (mouse insulin), one vial of calibrator 0, one vial of enzyme conjugate 11X, one
vial of enzyme conjugate buffer, one bottle of wash buffer 21X, one bottle of substrate TMB, and one vial of
stop solution. You confirm that both kits contain antigens.
The applicable subheading for the Mercodia Glucagon ELISA kit and Mercodia Mouse Insulin ELISA kit
will be 3822.19.0030, Harmonized Tariff Schedule of the United States (HTSUS), which provides for
“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 3006; certified reference
materials: 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: Containing antigens or antisera: Other.”
The general rate of duty will be free.
The duties cited above are current as of this ruling’s issuance. Duty rates are provided for your convenience
and are subject to change. The text of the most recent HTSUS and the accompanying duty rates are provided
at https://hts.usitc.gov/.
This ruling does not address the applicability of any additional duties, taxes, fees, exactions and/or other
charges, which may apply to the goods discussed herein. This includes, but is not limited to, tariffs and other
duties as provided for in Subchapter III to Chapter 99, HTSUS. Thus, for example, in addition to the
classification stated above, the merchandise covered by this ruling may also need to be reported with either
the Chapter 99 provision under which an additional tariff applies or one of the Chapter 99 provisions
covering exceptions to such tariffs.
For further information to assist with the importation process, please refer to the frequently updated Cargo
Systems Messaging Service (CSMS) messages at
https://www.cbp.gov/trade/automated/cargo-systems-messaging-service and Frequently Asked Questions on
the Trade Remedy/IEEPA page at
https://www.cbp.gov/trade/programs-administration/trade-remedies/IEEPA-FAQ.
The holding set forth above applies only to the specific factual situation and merchandise description as
identified in the ruling request. This position is clearly set forth in Title 19, Code of Federal Regulations
(CFR), Section 177.9(b)(1). This section states that a ruling letter is issued on the assumption that all of the
information furnished in the ruling letter, whether directly, by reference, or by implication, is accurate and
complete in every material respect. In the event that the facts are modified in any way, or if the goods do not
conform to these facts at time of importation, you should bring this to the attention of U.S. Customs and
Border Protection (CBP) and submit a request for a new ruling in accordance with 19 CFR 177.2.
Additionally, we note that the material facts described in the foregoing ruling may be subject to periodic
verification by CBP.
This ruling is being issued under the provisions of Part 177 of the Customs and Border Protection
Regulations (19 C.F.R. 177).
A copy of the ruling or the control number indicated above should be provided with the entry documents
filed at the time this merchandise is imported. If you have any questions regarding the ruling, please contact
National Import Specialist Fei Chen at [email protected].
Sincerely,
(for)
Denise Faingar
Designated Official Performing the Duties of the Division Director
National Commodity Specialist Division