Test directory: Cholinesterase, RBC & Plasma

Ordering Code 524
Test Name Cholinesterase, RBC & Plasma
Alias Pseudocholinesterase
Preferred Specimen Whole Blood and Plasma
Preferred Container Two EDTA, K2 (Lavender)
Optimum Volume 5 mL EDTA Whole Blood and 1 mL EDTA Plasma
Collection Instructions Draw two EDTA lavender tubes of whole blood.
Handling Instructions Spin one EDTA tube to separate plasma. Pour plasma into plastic aliquot tube and refrigerate. Send both whole blood and plasma samples refrigerated. Do not send packed cells
Do not send one tube of whole blood. Plasma cholinesterase results, as well as the calculated RBC cholinesterase results, are not accurate if plasma sample is not separated from the RBC's in a timely manner.
Transport Requirements Oahu: Refrigerated
Airline: Refrigerated
Specimen Stability Ambient: 1 Day
Refrigerated: 1 Week
Rejection Criteria Received ambient at reference laboratory, Frozen, Hemolyzed,
Plasma not separated from cells, One tube of whole blood only received, Lipemic
Avail. Stat NO
Analytic Time Up to 5 Days
Methodology Kinetic Spectrophotometric
Reference Lab  Quest Diagnostic Lab-NI

Reference range(s)

The reference ranges listed below are valid on this date of May 11, 2025.
Component Age Male Norm Male Critical Low Male Critical High Female Norm Female Critical High Female Critical Low Units Add'l info
Cholinesterase, RBC ALL See report.
Cholinesterase, Plasma ALL See report.