The triiodothyronine uptake test, was performed on 44 patients suffering from a variety of thyroid diseases plus 11 pregnant women, using this hormone labeled with I-131 and ionic exchange resin. Among the 44 patients there were 20 with thyrotoxicosis, 10 hypothyroid, 8 with diffuse non-toxic goiter and 6 with other thyroid conditions with no evidence of thyroid disfunction. An averange of 48,9% uptake for the hyperthyroid, 22,2% for the hypothyroid an 23,3% for the pregnant women was found. This gave a very significant difference from the normal group that averaged 32% according to a previous report. There was no difference between the normal group and the other two groups having no functional disturbance. Our results agree with the findingsof the other investigators in other countries. We think that this is a useful test adding a new parameter for the study of thyroid function. It is n...

These are the results obtained by measuring the serum concentration of total thyroxine, T4, using a competitive protein binding (CPB) technic and triiodothyronine, T3 (3, 3,5 triiodo-l-thyronine), with a radioinmunoassay technic employing Sephadex columns to separate the thyronines.  We measured the serum thyroxine in 61 normal subjects obtaining an average of 7.4 +- 1.9 (1 SD) ug/100 ml of serum (range 4.1 - 11 ug/100 ml); a group of 16 clinical hyperthyroid patients had an average of T4 of 19.8 +- 6.8 (1SD) ug/100 ml (range 12-39 ug/100 ml) and 11 hypothyroid patients had an average of 2.4 +- 1.4 (1 SD) ug/100 ml of serum (range 0.2-4 ug/100 ml). The serum concentration of triiodothyronine (T3) performed in 52 normal subjects was 157 +- 31 (1 SD) ng/100 ml of serum (range 110-225 ng/100 ml). In 14 hyperthyroid patients the average was 572 +- 349 (1SD) ng/100 ml (range 275-1360 ng/...

These are the results obtained by measuring the serum concentration of total thyroxine, T4, using a competitive protein binding (CPB) technic and triiodothyronine, T3 (3, 3,5 triiodo-l-thyronine), with a radioinmunoassay technic employing Sephadex columns to separate the thyronines.  We measured the serum thyroxine in 61 normal subjects obtaining an average of 7.4 +- 1.9 (1 SD) ug/100 ml of serum (range 4.1 - 11 ug/100 ml); a group of 16 clinical hyperthyroid patients had an average of T4 of 19.8 +- 6.8 (1SD) ug/100 ml (range 12-39 ug/100 ml) and 11 hypothyroid patients had an average of 2.4 +- 1.4 (1 SD) ug/100 ml of serum (range 0.2-4 ug/100 ml). The serum concentration of triiodothyronine (T3) performed in 52 normal subjects was 157 +- 31 (1 SD) ng/100 ml of serum (range 110-225 ng/100 ml). In 14 hyperthyroid patients the average was 572 +- 349 (1SD) ng/100 ml (range 275-1360 ng/...