How should one choose among the top domestic ELISA kit brands?

In the past year, I have used Lianke, Xinbosheng, Sizhengbo, and Elabscience, and I feel that inter-batch stability cannot be judged by brand alone; you need to lock in the same batch and reserve quality control wells. For routine inflammatory factors within 300, most can be negotiated down, while special factors may be stuck at the line. For delivery response in Beijing, Dakewe and Sizhengbo local warehouses are relatively fast, while Lianke sometimes ships from Shanghai and may be one day slower, so if it is urgent, confirm that it is Beijing stock rather than transferred inventory. After arrival, I first run the standard curve. If the CV of standard replicate wells is obviously high or the OD values overall are lower than previous batches, contact the agent to confirm whether it is a batch issue. For 80 samples, it is recommended to reserve 2-3 wells for inter-plate quality control and not use them all up, so that replenishment or batch changes can be traced.

When choosing domestic ELISA kits, I value validation more than rankings. You can first request a small pack size or ask the sales rep for a trial, use the same batch of serum for linear dilution recovery and inter-plate QC wells, place 2 QC samples on each of 3 plates, and see whether the inter-plate CV can remain stably within 15%. If acceptable, then purchase in bulk. For the coating format, I would choose detachable strip pre-coated plates. About 80 samples with replicates will require roughly two plates. Do not buy whole plates that cannot be split, to avoid waste. The manufacturer's quality control documents should provide a CoA and a batch-to-batch consistency statement, with preference for ISO13485. For Beijing in-stock items, you can ask a local distributor to transfer stock, usually arriving in 1-2 days. After receipt, first run a standard curve to confirm that the OD value trend is normal before formal testing.

If you're prioritizing in-stock items in Beijing, don't just focus on "rankings." First, contact a local distributor and clarify stock availability, lot number, and expiration date. For 80 samples, it's recommended to buy enough for two 96T plates from the same lot at once to avoid mixing different lots. Recently, when placing orders, I require the sales representative to provide the inter-assay CV report and factory quality control data for that lot, especially the CV of standard curve replicates. As for brands, Lianke, Xinbosheng, Sizhengbo, and Dakewe basically all have distributors in Beijing. For common inflammatory factors such as TNF-α, IL-6, and IL-1β, a budget within 300 is generally sufficient; for special factors, you need to ask in advance. Before delivery, confirm the storage conditions and arrival time. Local warehouses usually deliver within 1–2 days.