TY - JOUR N2 - Introduction: Graves’ Disease (GD) is an autoimmune hyperthyroidism occurring mostly in young women. The main pathogenic role of the disease is attributed to TSH receptor antibodies (TRAb), which stimulate the thyroid gland to increase production of the most active thyroid hormone- triiodothyronine (T3). High level of TRAb and a large goiter size are commonly known as poor prognostic factors for the disease and are used to predict relapse. The aim: The purpose of our study was to check the correlation between fT3:fT4 ratio with TRAb concentration, total volume of thyroid and age of GD onset. Materials and Methods: 114 patients with onset or relapse of GD were analyzed. Those after thyroidectomy or radioiodine therapy were not taken into analysis. The data was retrospectively retrieved from the hospital’s records consisting of patients’ sex, age, level of TRAb, fT3, fT4 and thyroid volume on ultrasonography. The association between fT3:fT4 and TRAb concentration, thyroid volume and age was evaluated using Pearson correlation coefficient. Results: The group was predominated by women (19.3% men, 80.7% women). The average age was 47.0. The analysis revealed positive correlation between: 1) fT3:fT4 ratio and total volume of thyroid (correla-tion ratio: 0.37; p <0.05) 2) fT3:fT4 ratio and level of TRAb (correlation ratio: 0.26; p <0.05) 3) negative correlation between fT3:fT4 ratio and patient’s age (correlation ratio: –0.14; p = 0.144. Conclusions: Positive correlations between fT3:fT4 ratio and TRAb level and total volume of thyroid (poor predictors of GD) may confirm that high level of fT3 can also be a prognostic factor for GD severity. L1 - http://www.czasopisma.pan.pl/Content/118013/PDF/2020-02-FOMC-02-Minasyan-etal.pdf L2 - http://www.czasopisma.pan.pl/Content/118013 PY - 2020 IS - No 2 EP - 27 DO - 10.24425/fmc.2020.135010 KW - Grave’s disease KW - fT3:fT4 ratio KW - TRAb A1 - Minasyan, Mari A1 - Dulęba, Aleksandra A1 - Smalarz, Anna A1 - Stręk, Maria A1 - Bryniarski, Paweł A1 - Przybylik-Mazurek, Elwira A1 - Hubalewska-Dydejczyk, Alicja PB - Oddział PAN w Krakowie; Uniwersytet Jagielloński – Collegium Medicum VL - Vol. 60 DA - 2020.12.21 T1 - fT3:fT4 ratio in Graves’ disease — correlation with TRAb level, goiter size and age of onset SP - 15 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/118013 T2 - Folia Medica Cracoviensia ER -