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Cholinesterase, RBC and Plasma Test

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The Cholinesterase, RBC and Plasma Test assesses the activity levels of cholinesterase enzymes in red blood cells and plasma, aiding in diagnosing and monitoring organophosphate and carbamate poisoning.


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Test Code:


CPT Code(s):



Kinetic Spectrophotometric (KS)




No special preparation is required.

Test Results:

4-6 Business Days. May take longer based on weather, holiday, or lab delays.

Walk-In Lab is prohibited from selling Quest tests to residents in the following states:AZ, NY, NJ, RI

What is the purpose of this test?

The Cholinesterase, RBC and Plasma Test is a blood test that measures the levels of cholinesterase, red blood cells (RBC), and plasma present in the blood. Cholinesterase is an enzyme that breaks down acetylcholine, a neurotransmitter in the body, while RBC and plasma are components of blood that play important roles in various bodily functions. This test is usually ordered to identify any medical conditions or exposure to certain substances that may affect the levels of these components in the blood, such as organophosphate or carbamate poisoning. By measuring the levels of cholinesterase, RBC and plasma in the blood, doctors can diagnose and monitor the treatment of such conditions, as well as evaluate the overall health of a patient.


Who would benefit from this test?

The Cholinesterase, RBC , and Plasma Test would be beneficial to:

  • Individuals with symptoms suggestive of organophosphate or carbamate pesticide exposure
  • Workers involved in industries such as agriculture, horticulture, and pest control where exposure to pesticides is common
  • Individuals who have been exposed to nerve agents such as sarin or VX gas
  • Individuals with symptoms suggestive of myasthenia gravis or other neuromuscular disorders
  • Patients taking medications that affect cholinesterase activity, such as those used to treat Alzheimer's disease


When should I order a Cholinesterase, RBC , and Plasma Test?

Here are some symptoms that may warrant ordering a Cholinesterase, RBC, and Plasma Test:

  • Nausea, vomiting, or abdominal pain
  • Weakness, fatigue, or muscle pain
  • Difficulty breathing or shortness of breath
  • Headache, dizziness, or confusion
  • Skin rashes or irritation
  • Changes in vision
  • Seizures or convulsions

Please note that this is not an exhaustive list, and it is always best to consult with a healthcare provider for a proper diagnosis and treatment plan.

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