I'm sorry your question hasn't been answered yet. Category II nodule is considered benign, so the nodule is nothing to worry about.
As for the T3 and T4 - are they Free or Total? They aren't the same tests and don't provide the same information. Also, what are the reference ranges for each. Ranges vary lab to lab and have to come from your own report.
Has your wife been diagnosed with a thyroid condition? If so, which one and what, if any, medication does she take?