Other groups who may benefit include: Patients following gastric surgery (gastrectomy, bariatric procedures) where intrinsic factor production or absorption sites are compromised Individuals with malabsorption disorders such as Crohn's disease, coeliac disease, or chronic pancreatitis Strict vegans and vegetarians with dietary insufficiency, though oral supplementation is usually tried first Elderly patients with atrophic gastritis or reduced gastric acid production Patients on long-term metformin or proton pump inhibitors, which can impair B12 absorption Individuals with nitrous oxide exposure (recreational or medical), which can cause functional B12 deficiency Diagnosis typically involves serum B12 measurement, with levels below approximately 148 pmol/L (though thresholds vary between laboratories) generally indicating deficiency
While hyperhomocysteinemia may increase the risk of cognitive impairment and age-related neurodegenerative disease (e.g., Alzheimers disease), it is not clear whether vitamin B 12 deficiency contributes to the risk of dementia in the elderly
The black box warning on GLP-1 receptor agonists stems from animal studies showing C-cell hyperplasia and medullary thyroid cancer in rodents
How is intrinsic factor deficiency diagnosed
The duration varies based on the deficiency cause, symptom severity, and patient response
Many coders make the mistake of using this code too loosely
