system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 67-year-old man presents to his primary care provider for routine follow-up. He complains of mild fatigue and occasional tingling in both feet. He reports that this numbness and tingling has led to him having 3 falls over the last month. He has had type 2 diabetes mellitus for 23 years and hypertension for 15 years, for which he takes metformin and enalapril. He denies tobacco or alcohol use. His blood pressure is 126/82 mm Hg, the heart rate is 78/min, and the respiratory rate is 15/min. Significant laboratory results are shown:
Hemoglobin 10 g/dL
Hematocrit 30%
Mean corpuscular volume (MCV) 110 fL
Serum B12 level 210 picograms/mL
Which of the following is the best next step in the management of this patient’s condition?
assistant
Methylmalonic acid level