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A 53year old lady presented to her family doctor feeling generally unwell. The clinical information gave a history of recurrent respiratory tract infections. The serum results are as follows: Sodium: 140 mmol/L (134 - 145) Potassium: 4.4 mmol/L (3.6 - 5.3) Urea: 4.4 mmol/L (2.8 - 7.0) Creatinine: 81 µmol/L (62 - 133) Glucose: 4.9 mmol/L (3.5 - 7.0) Free T4 5.3 pmol/L (10 - 26) TSH 1.8 mU/L (0.25 - 5.5) Free T3 & prolactin were added to this sample with results as follows. Free T3 16.1 pmol/L (3.7 - 6.9) Prolactin 154 mU/L (80 - 530) Please send your comments (maximum 2 lines if possible) directly to [log in to unmask] not to the mailbase Best wishes Gordon Jacqui