VITAMIN A (RETINOL)
3 mL (1. 5 mL min.) serum from 1 Red Top (No Additive) tube. Separate serum within 1 hour of collection. Ship refrigerated or frozen. Wrap in aluminium foil to protect from light. Overnight fasting is mandatory.
High Performance Liquid Chromatography
Sample by Thu 1 pm
Report Wed Evening
Also see CAROTENE.