When can ECP samples be collected during the day?

ImmunoCAP ECP

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Serum samples for ECP measurements can be collected at any time during the day. Healthy individuals or patients with asthma show no significant circadian variation of ECP, except for patients with nocturnal asthma who tend to have higher ECP levels at night.
 
References
  1. Fitzpatrick MF, Mackay T, Walters C, Tai PC, Church MK, Holgate Tet al. Circulating histamine and eosinophil cationic protein levels in nocturnal asthma. Clin Sci 1992;83:227-232.
  2. Wempe JB, Tammeling EP, Koëter GH, Håkansson L, Venge P, Postma DS. Blood eosinophil numbers and activity during 24 hours: Effect of treatment with budesonide and bambuterol. J Allergy Clin Immunol 1992;90:757-765. 
Further Reading