A 57 year old man presents to your clinic with poorly controlled diabetes. His glucose reading is 25mmol/L. His observations are; temp 39C, HR 108bpm, BP 99/60mmHg and RR 32/minute. His urine dip also tested positive for blood and protein. Given the results below, what is the most appropriate investigation for this patient?
Sodium | 138mmol/L |
Potassium | 5.8mmol/L |
Urea | 20mmol/L |
Creatinine | 350µmol/L |