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Whole blood collection not recommended unless specifically requested.  If requested, collect Lithium Heparin.  Urine (24h pre-acidified) collection preferred if whole blood not specifically requested - refer link below.&

LAB NOTES:

If the Doctor has specifically requested whole blood Histamine - Freeze the whole blood tube (Lithium Heparin).

Transport frozen on dry ice with next routine metropolitan courier. (Mon-Fri)

Send to testing laboratory on dry ice. Do not pack dry ice in a sealed container.  Use appropriate PPE.