If there is a reason for using a log10 transform for this field, then the backtransformed (10**estimate, 10**stderr) values are what you should probably report to be consistent with the literature. If you truly need the expected value and the standard deviation of the expected value (standard error), there are two methods that we have used. These are the delta method and the omega method. The latter is spelled out in the PROC GLIMMIX documentation, referring to a lognormal distribution. You can use the formulas there, after converting the log10 values to natural logs (multiply by a constant). For the delta method, it turns out that Wikipedia has good formulas for E(X) and Var(X).
SteveDenham
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