Decision Layer
What to do with this topic
Use this page to decide whether b12 transport belongs near the top of your follow-up list or stays in the background.
What to validate first
methylmalonic acid, holotranscobalamin, vitamin B12 context, homocysteine
Why this topic matters
B12 transport becomes important when intake looks reasonable but functional support still looks uneven. DNA helps most when it shows whether transport and recycling deserve their own follow-up instead of being hidden inside broader methylation discussion.
How to use this page
Use the decision layer first, then move into genes, biomarkers, and related symptom pages only if the topic still looks relevant.
Why It Rises Or Falls
How this topic earns attention
What this topic can explain
People often assume B12 status is a simple intake question. In practice, transport, delivery, and recycling can all shape whether biomarkers and symptoms make sense.
What usually moves it up the list
B12 transport rises when MTRR and the supporting genes point in a coherent direction, and when the follow-up markers are practical enough to check early.
What usually keeps it in the background
A topic stays lower when the signal depends too heavily on symptoms alone or when other pathways show stronger, more testable drivers.
Validation markers commonly worth checking
methylmalonic acid
holotranscobalamin
vitamin B12 context
homocysteine
Sample Report View
How B12 transport appears in the sample report
B12 transport rises because delivery and recycling genes point in the same lower-support direction, making direct marker follow-up practical.
Moderate follow-up priority
Methylmalonic acid, holotranscobalamin, B12
This topic is worth validating if symptoms or existing labs point in the same direction, but it is not the first place to act.