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Anaemia: vitamin B12 and folate deficiency

A Canadian clinical summary of anaemia: vitamin b12 and folate deficiency, with source-attributed priorities and explicit jurisdiction boundaries.

JurisdictionCanada
Source check2026-08-20
Clinical reviewiatroX editorial team 路 Clinical editorial review 路 reviewed 2026-08-20 路 due 2027-08-20
AudienceHealthcare professionals practising in Canada
This is an iatroX educational summary of named Canada sources, not an official guideline. It does not replace the complete source documents, local policy, specialist advice or clinical judgement. British Columbia is used as an explicit Canadian implementation example, not as a national rule. Verify the equivalent pathway, formulary and escalation route in the patient鈥檚 province or territory.

British Columbia source: bounded use

Cobalamin (vitamin B12) and Folate Deficiency supplies a Canadian implementation example for this summary. It must not be presented as the rule outside British Columbia.
sources for this section:BC B12/folate

Source-attributed clinical priorities

  • Confirm deficiency and assess diet, malabsorption, pernicious anemia, medicines, alcohol and other causes of macrocytosis.
  • Treat suspected vitamin B12 deficiency promptly when neurologic features are present and avoid folate alone until B12 status is addressed.
  • Monitor hematologic and neurologic response and investigate persistent or unexplained abnormalities.
  • Neurologic B12 injury can occur without macrocytosis or severe anemia.
sources for this section:BC B12/folate

Practical assessment and management workflow

1
Review diet, gastric or bowel surgery, metformin, acid suppression, alcohol, autoimmune and malabsorption risk.
2
Measure blood count, B12 and folate and use confirmatory metabolic testing when results are equivocal.
3
Begin B12 promptly when neurologic disease is plausible and investigate pernicious anemia or malabsorption.
4
Track reticulocyte, blood-count and neurologic response and define long-term replacement need.
sources for this section:BC B12/folate

Safety, red flags and urgent escalation

  • Do not give folate alone before excluding or treating B12 deficiency because neurologic injury may progress.
  • Severe pancytopenia, neurologic deterioration or cardiac symptoms needs urgent assessment.
  • Check potassium and clinical response during treatment of profound deficiency when rapid marrow recovery is expected.
sources for this section:BC B12/folate

Confirm the local pathway before acting

British Columbia is used as an explicit Canadian implementation example, not as a national rule. Verify the equivalent pathway, formulary and escalation route in the patient鈥檚 province or territory.
sources for this section:BC B12/folate

Source and implementation boundary

Read this educational summary with the linked source, current Canadian product information where medicines are involved, and the applicable provincial or territorial pathway. Local formularies, reporting duties, referral routes and service availability can differ.
sources for this section:BC B12/folate

Source documents

Use the linked source documents for complete recommendations, evidence grading, exclusions and implementation detail.

  1. Government of British ColumbiaCobalamin (vitamin B12) and Folate Deficiencyaccessed 2026-08-20
    view source
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