11. Biochemical Measures, Assessments of haemoglobin, Other biochemical tests will be performed on a separate portion of blood (1.5 mL). These include: Assessments of C-reative protein. Assessments of serum ferritin, Assessments of retinol Assessments of folic acid, Assessments of Vitamin B12, We also use pool serum as internal quality control. We participate CDC vital EQA program for serum vitamin B12