How to use a Lancet for a finger stick, blood spot test. Okt 06, 2020 Written by Justin Price Filed under Vitamin D Previousx / Nextz Tweet How to use a Lancet for a finger stick, blood spot test. This super simple video takes you through the step by step process of using two frequently used lancet for finger prick blood spot or blood microtainer usage. Written by Justin Price Filed under Vitamin D Tweet