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enter image description here

$$\log_{10}~\mathrm{pg}/\mathrm{ml}$$

I do not understand the scale. How do I convert this to a standard concentration (without the logs)?

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To expand upon the comments, the y axis in this graph is simply the log of the concentration in pg/ml. To convert you use the equation $$C = 10^{y}$$ where y is the y value and C is the concentration. Note that in older literature, log was oftentimes assumed to be base e whereas nowadays we assume base 10. The figure (thankfully) clarifies this potential discrepancy.

A final note: log values are unitless so the y axis has no units. The units are reported here so that you know what the appropriate units of the converted value should be.

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