Fig. 2From: Experimental vitamin B12 deficiency in a human subject: a longitudinal investigation of the performance of the holotranscobalamin (HoloTC, Active-B12) immunoassayMMA and HoloTC. a MMA and HoloTC versus time. b MMA versus HoloTC. Lab MMA RI high = upper limit of plasma methylmalonic acid concentration reference interval defined by the testing laboratory. Lab HoloTC RI low = lower limit of serum holotranscobalamin concentration reference interval defined by the testing laboratoryBack to article page