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Dark Green tube used for:
Ammonia, lactate, HLA typing For lithium level, use sodium heparin. For ammonia level, use sodium or lithium heparin
Gray tube used for:
For lithium level, use sodium heparin. Glucoses requires a full draw (may cause hemolysis if short dray)
Royal or Dark Blue tube used for:
Toxicology and trace element testing (zinc, copper, lead, mercury) and drug level testing.
Purple or Lavender tube used for:
Hematology (CBC) and Blood bank (crossmatch); requires a full draw- invert 8 times to prevent clotting and platelet clumping.
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