Metabolism

From an Amazon review of Stelo:

By Day 5, accuracy dropped sharply:

Stelo showed 25–30 mg/dL higher than fingersticks, even at rest.

B vitamin deficiency testing:

The most sensitive diagnostic approach involves measuring serum methylmalonic acid (MMA) and homocysteine, as MMA is more specific for B12 deficiency, while homocysteine can be elevated in both B12 and folate deficiency.