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Effect of tube type on reactivity by IgG or IgM ELISA. Samples were collected into each of three tube types for the same individual (n = 10).
| Collection tube | IgG ELISA (mean AU/ml) |
IgM ELISA (mean AU/ml) |
|---|---|---|
| Serum | 10.07 | 2.6 |
| Plasma-heparin | 10.9 | 3.9 |
| K2EDTA | 11.5 | 3.4 |
