Urgently need a rat TNF-α ELISA kit. Which supplier has it in stock and offers a cheap 48T option?

For urgent needs, look for local in-stock items first—don't slowly place an order on the official website. You can contact local life science distributors or the brand's regional sales representative and ask them to check the actual warehouse inventory and commit to same-day or next-day shipping. Among domestic brands, Lianke, Dakewe, Beyotime, Elabscience, etc. have relatively high in-stock rates for rat TNF-α; imported BD and R&D often require transfers. Before placing an order, ask the sales representative to send an inventory screenshot or outbound order number—don't just take "it should be in stock" at face value.

The price difference between 48T and 96T is generally not a simple halving based on the number of wells; 48T is usually about 60% to 70% of the price of 96T, but it fluctuates across different channels and promotional periods. With a budget of around 2000, domestic 48T or some specially priced 96T can be covered, while imported options may be tight. Regarding invoicing, confirm directly with the sales representative whether special/general VAT invoices can be issued. Many universities and hospitals require a contract to be signed before invoicing. If urgent, you can proceed with a prepayment or offline approval first.

Most rat TNF-α kits are labeled as suitable for serum and plasma, but you need to check the type of anticoagulant clearly. EDTA, heparin, and sodium citrate plasma can generally all be used, but different anticoagulants may affect absolute values. It is recommended to use a single sample type consistently within the same experiment, and do not mix serum and plasma for comparison. After receiving the product, first perform spike recovery or parallel dilution on one or two serum/plasma samples to confirm that the matrix effect is within an acceptable range before running critical samples.

Whether you need to buy extra coating plates depends on whether you purchased a ready-to-use type. If the catalog number is pre-coated/ready-to-use, the plate is already coated, and you do not need to buy extra coating plates; if you purchased an antibody pair or an uncoated DIY kit, then you still need to do the coating, blocking, and standard curve yourself, so impatient people must not buy the wrong one. Before ordering, check the manual for the "pre-coated" or "coated plate included" label; choosing the wrong one when in a hurry will delay things even more.