Hi Rich,
Good call! I was busy using using my narrow field binoculars to concentrate on my wife's potential B12 deficiency in the brain. Maybe this will get some more people tested for Celiac Disease or problems with intrinsic factor when it indicates an upstream problem. Maybe this will become standard practice within a couple of decades.
Good call! I was busy using using my narrow field binoculars to concentrate on my wife's potential B12 deficiency in the brain. Maybe this will get some more people tested for Celiac Disease or problems with intrinsic factor when it indicates an upstream problem. Maybe this will become standard practice within a couple of decades.
Hi, cfsbear.
Thanks for posting this. I'm happy to hear that Quest is now offering the holotranscobalamin test. If a person takes this test as well as a urine methylmalonic acid and FIGlu test (such as in the Genova Diagnostics metabolic analysis profile, available either through a physician or from www.directlabs.com without a physician's order), this combination of results will indicate where the B12 problem lies. if present. If the holotranscobalamin test gives a low result, that will suggest that the B12 problem is upstream of that point. That is, the person has a low intake of B12, or is not able to absorb it well from food because of pernicious anemia or a gut problem, or they have a genetic transcobalamin deficiency, or some other problem upstream of this point. This would constitute a true B12 deficiency condition.
On the other hand, if the holotranscobalamin test gives a normal result, but the methylmalonic acid and FIGlu are high, that would suggest that there is a functional B12 problem in the cells themselves. This could be due to hijacking of the B12 by toxins as a result of insufficient glutathione to protect it (as proposed in the GD-MCB hypothesis for the pathogenesis of CFS) or due to an inborn error of metabolism involving the intracellular B12 processing enzymes, such as freddd has reported having.
I think this will be a very helpful test.
Best regards,
Rich