An 82-year-old woman is brought to the physician by her adult son for a follow-up examination. She has been on a tea and toast diet for the past 6 months since her husband passed away. Physical examination shows no abnormalities. MCV is 108 fL. Which of the following is most likely to be seen in this patient?
↑ Homocysteine; ↑ Methylmalonic acid
↑ Homocysteine; ↔ Methylmalonic acid
↑ Homocysteine; ↓ Methylmalonic acid
↔ Homocysteine; ↑ Methylmalonic acid
↔ Homocysteine; ↔ Methylmalonic acid
↔ Homocysteine; ↓ Methylmalonic acid
↓ Homocysteine; ↑ Methylmalonic acid
↓ Homocysteine; ↔ Methylmalonic acid
↓ Homocysteine; ↓ Methylmalonic acid
