Q: Which is more common in thyroid storm?
There is only one specific laboratory marker in thyroid storm i.e., low TSH and high free T4 and/or T3. All other laboratory findings are non-specific but help in making the diagnosis. One of such non-specific but important laboratory findings is hypercalcemia though mostly at a milder level. This is due to increased bone resorption and hemoconcentration.
Other associated findings can be hyperglycemia and abnormal LFT. Interestingly, CBC can have either leukocytosis or leukopenia.
Nayak B, Burman K. Thyrotoxicosis and thyroid storm. Endocrinol Metab Clin North Am 2006; 35:663.