Clinical laboratories generally define vitamin B12 deficiency as a serum level below 148 pmol/L, which is approximately 200 pg/mL
Gaillard PJ, Appeldoorn CC, Rip J, Dorland R, van der Pol SM, Kooij G, et al
However, data on the use of PD in this setting show that this technique has limited efficacy in the treatment of hyperammonaemia 33 , and the use of PD in the management of hyperammonaemia is now somewhat controversial
The New England Journal of Medicine, 10.1056/NEJMoa2511774
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