High TSH. This indicates failing thyroid gland. Tsh is the most sensitive test of thyroid function. It's sort of like the red light in your car. You may have to add gas or coolant or your car will eventually slow down or stop.
Yes. A high TSH in any assay - 1st or 3d generation means your thyroid is being pushed to work (subclinical hypothyroidism) or has failed (hypothyroidism). Ask your doctor if you need treatment. If you are a woman thinking about pregnancy see a thyroidologist to see if you need treatment.