laboratory diagnostic - others - Histamine - plasma, Non haemolysed EDTA plasma 1ml. The plasma must be frozen within 4 hour after collection and must be sent in the frozen samples container(!), Shake the tube gently by turning over. Whole blood can be stored for 2 hrs at ambient temperature or 12 hrs at +4°C. During this time, centrifuge for 15 minutes at 1000g. Aspirate the plasma slowly, to at least 1 cm from the sediment. After an anaphylactic shock, sample 30 to 60 min after the onset of clinical signs (SFAR recomendations); No sampling on glass tubes, Radioimmunoassay, ssso, todylaboratories®, bmn, code L16LD1620