Since she is adamant about not wanting to go to the doctor I spoke with the place where we go each year to get her general blood test and they gave me names of places that the test for B12 could be ordered and done directly instead of through the doctor. Maybe that away I can get the test and no for sure and then convince her to go to the doctor.

My question is i am noticing that there are several different B-12 tests.
One is called a B12 blood panel that test B12 and folic acid. Then there is the MMA test that can either be done by blood or urine.

So which of these test are the best? And for the MMA is urine or blood better?

Also while looking online about these tests I read that if someone has been supplementing with B12 then it will skew the tests and not make them accurate. It even said that you got to wait about a month of taking no B12 supplements before being tested to make sure the test is accurate. Is that true? She has been taking B12 5000mcg supplements for the past 3 weeks so how long should I wait before getting the tests so they are not skewed?