Detecting and Interpreting Vitamin B12 Levels
Author Information
Author(s): Delgado Jose Antonio, Pastor María I., Costa Gemma, Márquez Nuria, Bauça Josep Miquel
Primary Institution: Hospital Universitari Son Espases, Palma, España
Hypothesis
Can the presence of macro B12 affect the interpretation of vitamin B12 levels in patients?
Conclusion
Reports should include total vitamin B12 concentration, recovery percentage, and post-PEG concentration with adjusted reference intervals for better evaluation.
Supporting Evidence
- The recovery percentage post-PEG ranged from 60% to 107%.
- Statistically significant differences were found between the two criteria for estimating interference.
- 27 cases showed macro B12 coinciding with confirmed hypervitaminemia.
- No cases of macro B12 coincided with vitamin B12 deficiency.
Takeaway
This study helps doctors understand vitamin B12 levels better by suggesting new ways to check for problems that can make the tests confusing.
Methodology
A prospective study analyzed 488 serum samples to establish reference intervals post-PEG and a retrospective analysis evaluated the utility of definitions for macro B12.
Potential Biases
Potential bias due to the exclusion criteria and the reliance on laboratory systems for data extraction.
Limitations
The study's reference intervals depend on the laboratory's system and the selected healthy individuals may not represent true reference individuals.
Participant Demographics
488 individuals, 217 men and 271 women, average age 47 years.
Statistical Information
P-Value
<0.001
Confidence Interval
CI95%: 59–61% for recovery, CI95%: 107–129 for lower limit and CI95%: 494–517 for upper limit of reference intervals.
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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