Cholinesterase (Serum/Pseudo)
Private Cholinesterase Serum/Pseudo blood test in London for £82, measuring one specialist enzyme marker with results expected in around 1 week.
Turnaround time
1 week
Biomarkers count
1
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Overview of the Cholinesterase (Serum/Pseudo)
The Cholinesterase (Serum/Pseudo) blood test measures the activity of serum pseudocholinesterase, also known as butyrylcholinesterase.
The test contains 1 biomarker: Cholinesterase (Serum/Pseudo).
Pseudocholinesterase is produced mainly by the liver and circulates in the bloodstream.
It helps break down several ester-containing compounds and certain medicines.
One important clinical role involves metabolism of the neuromuscular blocking medicines suxamethonium, also called succinylcholine, and mivacurium.
Some people inherit variants in the BCHE gene that reduce pseudocholinesterase activity or alter how effectively the enzyme works.
If a person with substantial inherited deficiency receives suxamethonium, the muscle-relaxant effect can last much longer than expected.
This can result in prolonged paralysis and a need for continued assisted ventilation until the medicine has been cleared.
Pseudocholinesterase testing can therefore be important following an unexplained previous anaesthetic reaction or where a family history of pseudocholinesterase deficiency exists.
The enzyme is also inhibited by organophosphate and some carbamate compounds, including certain pesticides.
Measurement may therefore contribute to occupational or toxicological assessment following relevant exposure.
Low activity can have other acquired causes, including significant liver dysfunction, malnutrition, pregnancy, severe systemic illness and selected medicines.
A low result does not automatically determine whether the cause is inherited deficiency, toxic inhibition or reduced enzyme production.
Additional testing, such as a dibucaine number or genetic analysis, may sometimes be required when an inherited variant is suspected.
What Does the Cholinesterase (Serum/Pseudo) Test Check?
This test measures 1 biomarker.
Cholinesterase (Serum/Pseudo)
Measures serum pseudocholinesterase enzyme activity to support investigation of inherited enzyme deficiency, exposure to cholinesterase-inhibiting chemicals and selected causes of reduced liver enzyme production.
Who May Benefit From the Cholinesterase (Serum/Pseudo) Test?
This test may be useful where pseudocholinesterase deficiency, pesticide exposure or an unusual anaesthetic response needs investigation.
People who experienced prolonged paralysis after general anaesthesia - Reduced pseudocholinesterase activity can substantially prolong the effect of suxamethonium or mivacurium.
People who required unexpectedly prolonged ventilation following surgery - An inherited enzyme variant is one possible explanation when susceptible neuromuscular blockers were used.
People with a family history of pseudocholinesterase deficiency - BCHE variants can be inherited, so relatives may sometimes require testing.
People undergoing pre-operative investigation after a previous anaesthetic problem - Identifying reduced activity can provide clinically important information for future anaesthetic planning.
Agricultural workers with significant pesticide exposure - Organophosphate and carbamate compounds can inhibit cholinesterase enzymes.
People working in pest control or related occupations - Biological monitoring may be relevant where cholinesterase-inhibiting chemicals are handled.
People with suspected organophosphate exposure - Serum pseudocholinesterase can contribute to exposure assessment alongside symptoms and other investigations.
People with a previously unexplained low pseudocholinesterase result - Repeat testing and additional characterisation may help clarify the cause.
People with significant liver disease where this enzyme has specifically been requested - Reduced hepatic synthesis can lower serum pseudocholinesterase activity.
People specifically advised to obtain pseudocholinesterase testing - Specialist interpretation is particularly useful because several inherited and acquired factors can affect the result.
How to Prepare
Do not stop essential medication in preparation for testing unless specifically instructed.
If testing is being undertaken because of a previous anaesthetic reaction, the result should be clearly communicated to future anaesthetic teams and recorded in your medical history where appropriate.
Symptoms and Reasons to Consider the Cholinesterase (Serum/Pseudo) Test
Symptoms depend on why pseudocholinesterase activity is reduced. Inherited deficiency often causes no symptoms until a susceptible anaesthetic medicine is administered.
Previous prolonged muscle paralysis after surgery - This is one of the most important clues to inherited pseudocholinesterase deficiency.
Unexpected delay in recovering normal breathing after anaesthesia - Prolonged neuromuscular blockade can occur after suxamethonium in people with significant deficiency.
A close relative with a known pseudocholinesterase deficiency - Family history can justify testing even when you have never had anaesthesia.
Nausea following significant pesticide exposure - Organophosphate exposure can produce gastrointestinal and autonomic symptoms.
Excessive sweating or salivation after pesticide exposure - Cholinergic excess is a recognised feature of significant organophosphate poisoning.
Muscle twitching or weakness following chemical exposure - Cholinesterase inhibition can interfere with normal neuromuscular signalling.
Marked pinpoint pupils after suspected exposure - Miosis can occur in cholinergic toxicity.
Breathing difficulty after pesticide or nerve-agent exposure - Respiratory symptoms can indicate serious poisoning and require emergency treatment.
A previously unexplained low Cholinesterase result - Repeat testing can help establish whether enzyme activity remains reduced.
Suspected acute organophosphate poisoning with breathing difficulty, excessive secretions, confusion, severe muscle weakness or collapse is a medical emergency and should not be managed by waiting for a routine private blood-test result.
Inherited pseudocholinesterase deficiency itself usually does not cause day-to-day symptoms. Its main significance is the response to particular anaesthetic medicines.
How to Book Your Cholinesterase (Serum/Pseudo) Test
Booking your Cholinesterase blood test with London Blood Tests is straightforward.
Choose the Cholinesterase (Serum/Pseudo)
Select the individual pseudocholinesterase enzyme test.
Select your sample collection option
Choose an in-clinic blood draw or professional home or hotel phlebotomy according to availability.
Attend your appointment
A trained healthcare professional collects the required venous blood sample and relevant exposure or anaesthetic history should be documented.
Laboratory analysis
Your serum is analysed for pseudocholinesterase enzyme activity.
Receive your results securely
Your authorised result is delivered securely for interpretation according to the toxicological, hepatic or anaesthetic reason for testing.
When Will I Receive My Results?
The current London Blood Tests turnaround time for Cholinesterase (Serum/Pseudo) is approximately 1 week after the sample reaches the laboratory.
Your sample must undergo enzyme-activity analysis and laboratory authorisation before the result is released. The reporting period begins once the specimen enters the laboratory rather than from the time your blood is collected.
If a result is unexpectedly low, additional investigations such as repeat enzyme activity, dibucaine testing or genetic analysis may subsequently be recommended. These are separate tests and are not included within the standard 1-week turnaround.
Understanding Your Results
A reduced pseudocholinesterase activity result can have several explanations.
Inherited BCHE variants can produce low activity and increase the risk of prolonged paralysis after suxamethonium or mivacurium.
Acquired reductions can occur following organophosphate exposure, significant liver disease, malnutrition, pregnancy or severe illness.
The degree of reduction and the clinical context help determine which explanation is most likely.
A standard pseudocholinesterase activity measurement cannot always distinguish an inherited enzyme variant from an acquired reduction.
Where inherited deficiency is suspected, a dibucaine number can help characterise certain abnormal enzyme variants, while genetic analysis can provide further information in selected cases.
A result within the reference interval makes major pseudocholinesterase deficiency or substantial current inhibition less likely, although interpretation depends on the exact reason for testing.
Higher enzyme activity is generally less clinically important than reduced activity.
The result should always be interpreted using the analysing laboratory's reference range.
Why Book With London Blood Tests?
Private pseudocholinesterase testing in London - Access targeted serum enzyme testing privately.
Relevant to anaesthetic safety - Testing can investigate an unexplained prolonged response to particular neuromuscular-blocking medicines.
Useful for occupational toxicology - Serum pseudocholinesterase can contribute to assessment of significant pesticide exposure.
Relevant to inherited deficiency - Markedly reduced activity may prompt more specific enzyme or genetic testing.
Useful alongside liver assessment - Reduced hepatic synthesis can affect pseudocholinesterase activity.
Professional blood collection - In-clinic and mobile phlebotomy options can be arranged.
Secure reporting - Receive your authorised specialist result securely.
Clear pricing - The Cholinesterase (Serum/Pseudo) test costs £82.
Private Cholinesterase (Serum/Pseudo) Blood Test in London
London Blood Tests provides private Cholinesterase (Serum/Pseudo) testing in London for people requiring investigation of serum pseudocholinesterase activity.
The test costs £82 and measures one biomarker: Cholinesterase (Serum/Pseudo).
It may be particularly relevant following an unusual anaesthetic reaction, where an inherited deficiency is suspected, or during specialist assessment of organophosphate exposure.
Current customer-facing results are expected approximately 1 week after laboratory receipt.