72160-5

LOINC 2.82

Holo-transcobalamin II [Moles/volume] in Serum

Holo-TC-II Ser-sCnc

Definition

  • The fraction of vitamin B12 bound to transcobalamin II (TC-II), normally <30% of the total, is considered the "active" fraction available to cells. There have been claims in the literature that measurement of specifically the "active" fraction is an earlier indicator of deficiency, although as of 2011 this claim is reported to be controversial (Am J Clin Nutr. 2011 Jul;94(1):348S-358S. Epub 2011 May 18).

Component

  • Holo-transcobalamin II

Specimen / system

  • Ser

Class

  • CHEM

Property

  • SCnc

Scale

  • Qn

Related names

  • 2; Active B12; Active vitamin B12; Chemistry; Cobalamin; haptocorrin; holo-haptocorrin; holo-TC; Holo-TC-II; Holotranscobalamin; Level; Point in time; QNT; Quan; Quant; Quantitative; Random; Serum; SR; Substance concentration; TC; TC-2; TCII; TC-II; Transcobalamin; Transcobalamin 2; Vit B12; Vitamin B12

Index terms

  • 2
  • Active B12
  • Active vitamin B12
  • Chemistry
  • Cobalamin
  • haptocorrin
  • holo-haptocorrin
  • holo-TC
  • Holo-TC-II
  • Holotranscobalamin
  • Level
  • Point in time
  • QNT
  • Quan
  • Quant
  • Quantitative
  • Random
  • Serum
  • SR
  • Substance concentration
  • TC
  • TC-2
  • TC-II
  • TCII
  • Transcobalamin
  • Transcobalamin 2
  • Vit B12
  • Vitamin B12