transcobalamin II deficiency

ORPHA: 859

Overview

vitamin B12 deficiency that is characterized by a lack of vitamin B12 intestinal absorption resulting from a deficiency in the B12 transport protein TCII

Available Treatments (0)

No treatments linked yet

Clinical trials or compassionate use may be available — consult a specialist.

Clinical Presentation

Signs and symptoms associated with transcobalamin II deficiency, sourced from HPO and Orphanet clinical annotations.

ThrombocytopeniaDecreased total neutrophil countPancytopeniaDecreased total lymphocyte countAcute kidney injuryMegaloblastic bone marrowDecreased circulating IgA concentrationDecreased circulating total IgMAbnormality of chromosome stabilityDecreased circulating immunoglobulin concentrationDecreased circulating IgG concentrationMethylmalonic aciduria

Classification & Codes

Orphanet Code

ORPHA:859
transcobalamin II deficiency
OrphanetORPHA:859
Treatments0 drug(s)
Symptoms on record12 signs
Statuspublished
Factual Authority
Last Updated3/20/2026
Clinical DataHPO · Orphanet
Drug DataFDA · EMA · CDSCO