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For suspected macro-B12, precipitation with PEG is the test most often reached for, though it is nonspecific and can remove B12 that is fully available to cells, so direct measurement of the binding proteins, haptocorrin and transcobalamin, may be more informative when it is available

Cording says shell often recommend that patients have their B12 levels tested if theyre feeling slower than usual, tired, or feeling down and they dont know why

No objective vision measurements (visual acuity, visual field, OCT imaging)