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Your GP will interpret your B12 level in conjunction with other blood parameters, particularly: Full blood count (FBC) looking for macrocytic anaemia (enlarged red blood cells) or reduced haemoglobin Mean corpuscular volume (MCV) elevated MCV suggests B12 or folate deficiency Blood film may show hypersegmented neutrophils characteristic of B12 deficiency Folate levels often checked simultaneously as deficiencies can coexist If your B12 level is borderline (148-258 pmol/L) and you have suggestive symptoms, your doctor may request additional tests
Additionally, monitoring symptoms related to vitamin B12 deficiency, such as fatigue, weakness, and neurological changes, can help assess the overall effectiveness of treatment and guide further management strategies
It is important to distinguish between excessive supplementation and pathologically elevated B12 levels, which may indicate underlying haematological disorders, liver disease, or renal impairment rather than true overdose
Several commenters indicated they believe that replacing the estimated allowed amount with the median allowed amount and adding the 10th and 90th percentile allowed amounts would overwhelm patients with information that is difficult to interpret
