When plasma samples are limited, is an antibody array or Luminex more cost-effective for multiplex cytokine detection?

To measure over 20 inflammatory factors in 50 μL of plasma, if more than half of them are low-abundance (such as IL-10, IL-6, TNF-α), I would prefer Luminex. The sensitivity can usually reach the pg/mL level, and 25 μL of sample plus diluent is basically sufficient. An antibody array uses one membrane to test one sample. Although it can also measure over 20 factors, its detection capability for low-abundance indicators is relatively weak, and semi-quantitative results are more suitable for preliminary screening. Since your sample volume is limited, it is not recommended to use an array for trial and error first. First list the target factors and check the approximate ranges of their plasma levels in the literature. If most are below several tens of pg/mL, prioritize Luminex.

A budget of 8,000 is a bit tight. If you buy ready-made Luminex kits for more than 20 factors, a single kit is often not cheap, and you also have to add platform instrument time fees, unless you use an outsourcing service, where per-sample charging may be more controllable. With an antibody array, buying one membrane or a small set can be completed within the budget, but it can only test one sample, with no technical replicates. It is recommended to ask separately: the total cost for a single sample using an antibody array vs. a quote for testing 1–2 samples through a Luminex sample submission service, including instrument fees, consumables, and data analysis. Do not compare only reagent prices; when the instrument is not your own, service fees are often the largest part.

Chip batch-to-batch variability is indeed substantial, especially for membrane chips, where membrane background and color development conditions can drift between batches. If you are running chips, try to test all samples in the same batch and avoid cross-batch comparisons; add the same quality control plasma to each array or each plate to facilitate normalization. Luminex has relatively better batch-to-batch reproducibility, but the standard curve must be freshly prepared each time. Whichever you choose, do not use up all 50 μL of plasma; reserve 5–10 μL for pilot experiments or dilution linearity testing. If you have only a single sample, pooling and testing by well on Luminex may be a more sample-sparing approach with more comparable data.