0.3 mL minimum. No preservative necessary. Random collection should be first morning specimen. Draw 1 FULL Light Blue top tube. Minimum 1 mL. Transport to lab on ice within 1 hour.
Any further delay requires separation and freezing of plasma in a plastic tube.
Draw one FULL Light Blue top tube. Spin and separate plasma into 2 mL aliquots. 1 mL serum. Use gel or transfer tube. Collect 24 hr.