How much explanatory weight should the mildly elevated TSH carry at this point?

What information would be most useful to seek next before deciding what is driving her symptoms?

Sprint 08: Three Weeks of Fatigue and Lightheadedness

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High weight — it is the leading explanation for both the fatigue and lightheadedness

Moderate weight — it could contribute, but the symptom pattern still needs to be characterized before linking it to both complaints

Low weight — the normal free T4 makes significant thyroid dysfunction less likely, though the result should not be dismissed outright without more information

Very low weight — the abnormal TSH is probably incidental and can be set aside unless other symptoms emerge

Uncertain — there is not enough information yet to assign it a clear explanatory role

Orthostatic blood pressure and heart-rate changes that reproduce her usual symptoms

Which information should carry the greatest weight in explaining her intermittent lightheadedness?

Address the likely volume and orthostatic contribution to her lightheadedness while interpreting and following the thyroid abnormality on its own clinical merits

Treat the volume and orthostatic problem as the explanation for both fatigue and lightheadedness, and revisit the thyroid result only if fatigue persists

Focus on the orthostatic explanation and defer further interpretation of the thyroid result until the lightheadedness has resolved

Prioritize the thyroid abnormality as the unifying explanation because it could account for the fatigue, while treating the orthostatic findings as secondary