had b12 injection but still tired I Feel All the Time. Do I Need a Shot?: Shawn Veiseh, M.D.: Family Medicine B12 Injection Walk-In Clinic North

As indicated in a recent report of the International Myeloma Working Group Mass Spectrometry Committee, although requiring assessment in a specialized laboratory, mass spectrometry can be effectively used to evaluate M-protein levels in treated patients and achieve high sensitivity in detecting residual serum M-protein

As levels of progesterone increase throughout the pregnancy so does the development of the glands

If it has been 4 weeks then that probably is an indication that that is the point at which your B12 levels have dropped again

Post-treatment serum B12 measurements can be misleadingly high and may not accurately reflect tissue levels, so your GP will focus on symptom improvement and clinical assessment