Sourcing microbiological culture media from China

0% on a single line

Read from the UK Trade Tariff on 28 September 2026, heading 3821 is a single line, 3821 00 00 00, prepared culture media for the development or maintenance of micro-organisms (including viruses and the like) or of plant, human or animal cells. It carried 0% on goods from China, with no anti-dumping measure.

Diagnostic reagents and test kits are heading 3822, covered in our diagnostic and lab reagents guide; confirm the commodity code for each product.

Diagnostic use and animal-derived ingredients

Media intended for diagnosis, such as media sold to clinical laboratories to identify pathogens, are in vitro diagnostic medical devices under the Medical Devices Regulations 2002: they need UKCA or CE marking under the IVD rules, a UK Responsible Person where the maker is overseas, and MHRA registration before being placed on the Great Britain market. Media for research, teaching or food and water testing should be labelled and sold for that use.

Some media contain animal-derived ingredients, such as blood, serum or egg yolk. Products of animal origin and animal by-products can be subject to import controls under retained Regulation (EC) No 1069/2009 and the GOV.UK import notification system, so check the status of each formulation before ordering; dehydrated media made from plant peptones avoid the question.

Specifying culture media

Specify each formulation by name and composition, the form (dehydrated powder, prepared plates, tubes, bottles or broths), pH at 25 °C, fill volume or plate depth, the reference strains used in the maker's growth promotion and selectivity tests, sterility testing, shelf life and storage temperature, and a certificate of analysis for every lot.

For university and research buyers, see our lab equipment guide for UK universities and our service for university and research laboratories.

Worked duty example

An invented example rather than a quote: 500 kg of dehydrated culture media powder in sealed tubs, under 3821 00 00 00, at £18,000 free on board with £2,000 of air freight and insurance, so the customs value is £20,000. There is no duty; import VAT at 20% is £4,000, which a VAT-registered buyer normally reclaims. Dehydrated media travel at room temperature and keep for years, so they can go by sea; prepared plates and tubes need a cold chain and have a short shelf life, which usually rules out sea freight. See calculating UK import duty and VAT for the method.

Inspection checklist

Lot performance: for each lot, check the certificate of analysis names the reference strains used and the growth, inhibition and appearance results, and repeat a growth promotion test in your own laboratory on the first lots.

Physical checks: check pH, gel strength and clarity on prepared media, powder flow and caking on dehydrated media, fill volumes and labelling with lot number and expiry date.

Cold chain and dates: for prepared media, agree a minimum remaining shelf life at delivery and ship with temperature loggers. See our quality inspection guide.

What goes wrong

Culture media fail on performance, sterility and dates. A lot that does not support growth of the reference strains gives false negatives, contaminated prepared media give false positives, dehydrated powder cakes if it absorbs moisture, and prepared plates arrive with too little shelf life left to use.

Cambridge China Bridge sources dehydrated and prepared culture media for UK laboratories, with lot certificates, shelf life and the diagnostic or research status settled before the order.