Thyrostats (Urine)

The use of thyrostats is banned within the EU under Council Directive 96/22/EC. As such, no Maximum Residue Limits (MRLs) are defined in Commission Regulation (EU) 37/2010 for thyrostats due to the risk they pose to human health. There is, however, guidance on Minimum Method Performance Requirements (MMPRs) for certain thyrostats, including Thiouracil, Methylthiouracil, Propylthiouracil, Tapazole (Methimazole), Benzylthiouracil and Mercaptobenzimidazole, as outlined in Commission Regulation (EU) 2019/1871.

This test screens for the presence of the following compounds: 2-Thiouracil, 6-Methyl-2-thiouracil, 6-Phenyl-2-thiouracil, 6-Propyl-2-thiouracil and Methimazole (Tapazole).

This test is typically carried out in urine samples only.

The analytical method used at Fera is based on sample extraction with derivatisation using iodobenzyl bromide. Testing is then carried out using liquid chromatography–tandem mass spectrometry (LC–MS/MS).

Fera’s food safety experts use established, accredited analytical testing methods to detect and quantify thyrostat residues within your food samples. We provide the evidence required by regulators to verify that levels of thyrostat residues within your food products are compliant.

Our analytical methods are validated in accordance with the principles set out in Commission Decision 2002/657/EC and accredited to ISO/IEC 17025 by the United Kingdom Accreditation Service (UKAS).

Confirmatory Analysis

Where required, confirmatory analysis is charged at the same rate as the primary test. We will contact you before proceeding. Confirmatory results will be delivered within 10 working days of your instruction.