#february2020usmle2ck
Which one of the following tests can be used to distinguish between Folic acid and vitamin B12 deficiencies?
A- Serum cystathionine level
B- Serum homocysteine level
C- Serum methionine level
D- Serum methylmalonate level
Which one of the following tests can be used to distinguish between Folic acid and vitamin B12 deficiencies?
A- Serum cystathionine level
B- Serum homocysteine level
C- Serum methionine level
D- Serum methylmalonate level