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I think it is necessary because almost all foods contain potassium.
Vitamin D tests require four hours of fasting before the test can be conducted. It is also necessary to refrain from taking any vitamin D supplements or being exposed to the sun.
There is no fasting needed for a CBC. If other blood tests are needed, you might need to fast for twelve hours before the test.
for fasting blood sugar 7 or 8 hours sufficient. for random or ppbs there is no need for fasting.
Radioactive emission.