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Measuring serum B12 concentration A medical specialist received a letter stating, you have treated people with normal serum B12 concentrations with B12 injections, for which there is no proof
That is not, on its own, a reason to dismiss the work
Not getting enough vitamin B12 can cause tiredness and weakness, which can make it harder to stay active or stick to healthy habits
Joint aspiration for laboratory analysis may ultimately be required, as it can identify urate crystals, and Gram stain or culture can confirm/exclude the presence of infection
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