What was meant for low in t3 (liothyronine)?

T3 (liothyronine) is one: Of the thyroid hormones. It cannot be interpreted in a vacuum. Need to know free level, T4 and tsh.

Possibly nothing: If your other thyroid tests are normal, the low T3 (liothyronine) is probably irrelevant. T3 (liothyronine) levels in the cell are what's important, not in the blood stream -- except for highly elevated T3 (liothyronine) which can indicate an overactive thyroid.