I have been very tired in the run up to my injection so the doctor asked me to have a blood test just before my injection was due. I did this on Tuesday & got my injection this morning. The results from the blood test showed my B12 as normal (560 range 200-900). My question is will this be total B12 or active B12? I have heard this term used but not sure what it means but like some information before I go back to see GP. Thanks.