Beginning Tuesday April 1, 2008 the Mailout Service Center will change the primary tube type for Vitamin D 25-Hydroxy to lithium heparin. (Light green plasma collection tube). Sample volumes have not changed. This change will be reflected in the Pathology Handbook on April 1, 2008. Questions may be addressed to Martha Holm, Pager: 7283, Phone: 356-8626.