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Figure 2 | BMC Research Notes

Figure 2

From: IGRA tests perform similarly to TST but cause no adverse reactions: pediatric experience in Finland

Figure 2

Improvement of the calibration curve for IFNγ-measurement. For measurement of IFN-γ levels, the original EIA reagent from Cellestis (circles) was substituted by that of PeliKine Compact human EIA (squares). This resulted in a steeper calibration curve and the use of the whole dynamic range of the photometer. Analytically, this means more accurate result interpretation in the cut-off zone. OD405 nm, optical densities measured at 405 nm.

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