Your Vitamin B12 Level

What Causes Abnormal Vitamin B12 Levels?

Abnormal vitamin B12 levels can have various causes, just like most other symptoms.  Finding the true cause means ruling out or confirming each possibility – in other words, diagnosis.

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Diagnosis is usually a complex process due to the sheer number of possible causes and related symptoms.  In order to diagnose abnormal vitamin B12 levels, we could:

  • Research the topic
  • Find a doctor with the time
  • Use a diagnostic computer system.
The process is the same, whichever method is used.

Step 1: List all Possible Causes

We begin by identifying the disease conditions which have "abnormal vitamin B12 levels" as a symptom.  For example, vitamin B12 need.

Step 2: Build a Symptom Checklist

We then identify all possible symptoms and risk factors of each possible cause, and check the ones that apply:
loss of appetite
not supplementing B12
broad-spectrum antibiotic use
recent onset diarrhea
numb/burning/tingling extremities
major unexplained weight loss
reduced mental clarity
poor balance
shortness of breath when at rest
much vitamin C supplementation
constant fatigue
slight tongue soreness
... and more than 10 others

Step 3: Rule Out or Confirm each Possible Cause

A differential diagnosis of your symptoms and risk factors finds the likely cause of abnormal vitamin B12 levels.

Arriving at a Correct Diagnosis

The Analyst™ is our online diagnosis tool that learns all about you through a straightforward process of multi-level questioning, providing diagnosis at the end.

If you indicate having had recent lab tests, The Analyst™ will ask further questions including this one:
Vitamin B12 (cobalamin). Unit: pg/mL [pmol/L]
Possible responses:
→ Don't know
→ Confirmed deficiency in the past
→ Under 200 [150] (low)
→ 200-950 [150-700] (normal)
→ Over 950 [700] (elevated)
Based on your response to this question, which may indicate history of B12 deficiency, B12 deficiency, normal B12 levels or elevated B12 levels, The Analyst™ will consider possibilities such as Vitamin B12 Requirement.  A urine MMA test is recommended for properly diagnosing B12 deficiency due to the possible lack of sensitivity of serum B12 tests.  A normal or high B12 level makes B12 deficiency less likely, but does not rule it out.
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