Yes, there is a urine test. The test measures the amount of a substance called methylmalonic acid (MMA) in your urine. MMA is typically made in tiny amounts when you digest protein. Your body makes large amounts of MMA if you have a decrease in the amount of vitamin B12.
Yes, vitamins and minerals can be tested for nutritional deficiencies specially vitamin D and vitamin B12.
Yes, ideally one should stop taking vitamin D before a blood test.
No, there are no self test kits available in India at the moment.
High levels of B12 is rare, however, it may be a sign of a serious, even life-threatening, disease. Hematologic disorders like chronic myelogeneous leukemia, promyelocytic leukemia, polycythemia vera and also the hypereosinophilic syndrome can result in elevated levels of cobalamin. You are recommended to check with a doctor.
After an injection the serum B12 value rises quickly to far above the upper reference value on average 150-700 pmol/L
Adding more iron and B12 helps increase MCH values. Consuming vitamin C and fiber, along with foods that contain iron, may also help increase the MCH levels.
They vary because of the machines caliberation and the reagents used.
The benefits of general blood tests are early detection of diseases and monitoring existing conditions.