MRCP2-1300

MRCP2-1300

A 35-year-old man presents to the hypertension clinic with daily headaches for the past 3 months. He reports feeling otherwise well. On examination, his blood pressure is 165/90 mmHg, heart rate is 80 beats per minute, temperature is 37.2 ºC, and SpO2 is 96% on air. Notably, he has pronounced lower jaw protrusion with increased interdental spaces. Laboratory results show a hemoglobin level of 145 g/L, platelets of 225 * 109/L, WBC of 8.2 * 109/L, Na+ of 138 mmol/L, K+ of 3.8 mmol/L, urea of 5.4 mmol/L, and creatinine of 66 µmol/L. His random glucose level is 14.5 mmol/L. What is the initial investigation that should be performed?