Hemoglobin Ai levels in hyperthyroidism.

Hemoglobin AI (HbAI) was studied in 21 cases of hyperthyroidism (H) and 33 control subjects (C). The correlation equations between fasting blood glucose (FBG, mg/dl, x) and HbAI (%, y) in the H and C groups were: y=0.07x+1.26 (r=0.5, p less than 0.05) and y=0.048x+2.23 (r=0.94, p less than p.001), respectively. Five cases in the H group showed a higher level of HbAI far outside the confidence of 5% level of significance calculated from correlation equation for the C group. The correlation equation for the sum of blood glucose (sigma BG, mg/dl, x) during GTT and HbAI (%, y) in the H group was y=0.003x+5.3 (r=0.64, p less than 0.01); in the C group y=0.005x+3.1 (r=0.88, p less than 0.001). sigma BG and HbAI showed a close correlation in both groups. According to the results of the GTT, the subjects, either C or H group, were divided into three sub-groups: normal (n), borderline (b) and diabetic (d). The correlation equation between triiodothyronine (T3, ng/dl, x) and HbAI (%, y) in the H group was calculated as y=0.003x+6.49 (r=0.58, p less than 0.05). T3 in the n subgroup was 331 +/- 90 ng/dl, in the b subgroup 362+/-166 ng/dl and in the d subgroup 621+/-227 ng/dl, and there was a statistical difference between the b and d groups.