MRCP2-1066
A 25-year-old female presents with acute illness. She has been experiencing weight loss, tiredness, and lethargy for the past three months, which has worsened over the last week. Her general practitioner had diagnosed her with hypothyroidism six weeks ago, with a Free T4 level of 8.8 pmol/L (10-22) and a Plasma TSH level of 5.5 mU/L (0.4-5). She had started taking thyroxine 50 µg daily but has deteriorated over the last two weeks. Her mother and maternal grandmother have also been diagnosed with hypothyroidism and take thyroxine. She is a non-smoker, does not drink alcohol, and takes the oral contraceptive pill.
On examination, she appears unwell and mildly dehydrated, with a temperature of 37.5°C and a BMI of 21.3 kg/m2. Her blood pressure is 72/44 mmHg, with a pulse of 100 beats per minute. Cardiovascular examination is otherwise normal, and there are no abnormalities on respiratory or abdominal examination. Brief neurological examination is normal, and both plantars are flexor.
The investigations requested by the house officer are currently unavailable. In the meantime, what is the most appropriate immediate management for this patient?