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You are an older adult: Stomach acid production tends to decline with age, which can make it harder to absorb B12 from food and raises the risk of deficiency

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The increase in circulating cobalamin levels is predominantly caused by enhanced production of haptocorrin.Several liver diseases like acute hepatitis, cirrhosis, hepatocellular carcinoma and metastatic liver disease can also be accompanied by an increase in circulating cobalamin

Although chronic kidney disease is not diagnosed until the eGFR reaches 60 mL/min, being able to detect earlier, less-significant decrements in kidney function is important, as the period of subclinical kidney dysfunction before overt kidney disease can be diagnosed based on creatinine may last one to two decades (Rush-Monroe 2013