<p>1. Anyone with history of Vitamin B 12 deficiency and is monitoring their level</p>

<p>2. If your taking B12 supplements and require lab monitoring</p>

<p><br />
3. As part of an anemia work up</p>

<p>4. If you prevously had gastric bypass surgery or if you have&nbsp;<br />
chronic illnessess that affect your gut</p>