Thyroid Investigations Flashcards
What are the optimal ratios of;
FT3/FT4 =
T3/RT3 =
FT3/FT4 = >0.33 T3/RT3 = >6
What do comphressive thyroid tests NOT assess?
Tissue levels of T3
What is the opitmal range of TSH?
0.4-2.5
What is the optimal range of Total T4?
70-150
What is the opitmal range of FT4?
12.8-19.5pg/ml
What is the optimal range of FT3?
3.2-4.5pg/ml
What is the opitmal range of Thyroglobulin antibodies?
no optimal range
What is the optimal range of TPO antiobodies?
No optimal range
What is the optimal range of RT3?
11-18ng/dl
High TSH + Normal T4 and T3 =
subclinical hypothyroidism
High TSH + Low T4 + low/normal T3 =
Hypothyroidism
Low TSH + normal T4 and T3 =
Subclinical hyperthyroidism (unless on T4 therapy)
Low TSH + high/normal T4 and T3 =
Hyperthyroidism
Low TSH + low T4 and T3 =
Secondary hypothyroidism
What needs to be checked on a thyroid test for a full assessment?
Total and free T4, total and free T3, RT3 and thyroid antibodies