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Serum B12 reference ranges vary between laboratories, but generally, levels below 148 pmol/L are considered deficient, whilst levels between 148258 pmol/L are regarded as borderline and may warrant further investigation or a trial of treatment, particularly if symptoms are present
The risk of injecting degraded or contaminated peptide is not worth the cost savings of squeezing a few more doses from an old vial
On a U-100 insulin syringe, 1mL = 100 units
This is not the best way
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