Additionally, when seeing the specialist, you need to find out their office policies on billing for workers compensation.--My background is in workers compensation medical claims, and I believe you may have difficulties supporting that your TSH level is related to your carpal tunnel. Your medical records from the specialist will probably need to support the correlation between the two. It is common for physicians to run those lab tests to pre-determine if there is an underlying medical reason for your carpal tunnel (such as diabetes), sound like the discovery of your TSH is incidental. As the others have recommended, definitely get approval from your workers comp adjustor before having that appointment.