The resources on the net are all over in normal ranges... and my two clinics vary (200-1000; 180-914). I'm 1018. Some of the newer studies that connect high ranges of B12 to certain lymphomas say ranges should not go over 800.
Neither doctor office wants me to come in. "you're fine. don't worry about it". Neither seem to be concerned that my mom's mom had lymphoma. "You're being paranoid".
It doesn't sit well with me.