What does the Vitamin B12 (B12) - B12 blood test mean? Get a free analysis of your blood test now. Here's what you get with our free analysis:
Vitamin B12, also known as cobalamin, is essential for proper red blood cell formation, neurological function, and DNA synthesis. This test measures the amount of vitamin B12 in the blood to detect deficiencies or excesses. B12 is crucial for maintaining healthy nerve cells and producing genetic material. It works closely with folate in making red blood cells and helps iron function properly in the body. The body doesn't produce B12, so it must be obtained through diet or supplements. Common sources include meat, fish, eggs, and dairy products. Vegetarians and vegans may be at higher risk of deficiency.
A low vitamin B12 level may indicate:
Symptoms of deficiency can include fatigue, weakness, constipation, loss of appetite, weight loss, and neurological changes such as numbness and tingling in the hands and feet. Severe deficiency can lead to anemia, balance problems, depression, and memory issues.
High vitamin B12 levels are less common but may indicate:
While high B12 levels are generally not considered harmful, they may mask underlying health conditions. In some cases, elevated B12 can be associated with increased cancer risk, though this relationship is not fully understood. It’s important to note that the body excretes excess B12 in urine, so toxicity from dietary sources is rare. However, unusually high levels should be investigated to rule out underlying health issues.