Fig. 1From: Folate deficiency in an unselected population in Calgary, Alberta and its relationship with red blood cell macrocytosisReceiver operator characteristic curves for red blood cell mean corpuscular volume (MCV) and serum folate deficiency using the cut-off values of <12, <10, <8, and <6 nmol/L for serum folate. All cut-off values show a poor relationship between MCV and folate deficiency (areas under the curve are given in the text).Back to article page