If your tsh was 0.250 with first test abdominal scan shows you have a goiter and a cyst on your thyroid but the second blood test tsh now 0.612?

Thyroid.: TSH can vary slightly as in your case. On average your TSH seems pretty normal. Might want to repeat this in a few months. Mild goiter and cyst on thyroid may be related - maybe not. Depends on size and appearance. You should f/u with the doc who ordered the study.

TSH: Variation in TSH. The 0.250 seems borderline low. Did they check for thyroid antibodies ( anti-peroxidase, anti ttyroglobulin antibodies? Sometimes when there is thyroid dysfunction or Hashimotos disease ( antibodies to thyroid) initially TSH is low as the thyroid is overacitve and then rises to the point where you may need hormone replacement. Lots of women have it . Monitor and F/U w/ doc