Does an elevated T4 count mean that I will definitely have a molar pregnancy or what else could it be?

Probably thyroid. T4 is the measure of thyroid hormone. If it is elevated, it could be normal or a sign of hyperthyroidism or overactive thyroid. If your blood pregnancy hormone (HCG) is really high due to a molar pregnancy or having more than one baby, it can make your T4 high. The other tests to do to find out the cause would be tsh, t3, (liothyronine) HCG and us.