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Acetaminparaldehydeserplql

Published: August 9, 2026Updated: August 16, 2026

This test checks whether acetaldehyde and paraldehyde are present in your blood serum or plasma.

Quick summary

{"The test detects two substances: acetaldehyde (from alcohol metabolism) and paraldehyde (a sedative medication)","It is a qualitative test, meaning it shows only whether these substances are present or absent, not the exact amount","Sample is collected from a vein in your arm","Results help doctors evaluate alcohol metabolism or exposure to certain chemicals","No special fasting is typically required unless your doctor instructs otherwise"}

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
43721-0
Short code
ACET-PARA
Synonyms
Acetamin+Paraldehyde SerPl Ql
Category
chemistry
Sample
serum
Container
Red top serum separator tube (SST) or plain red top tube
Units
N/A
Ref low
0
Ref high
0
Fasting
false
Population
adult
Sex
all
Age range
≥ 18 years
Method
Gas Chromatography-Mass Spectrometry (GC-MS) or Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
CPT
80307 (Drug testing, per screen, per panel; each procedure)
SNOMED
373561008 (Acetaldehyde measurement)
Specimen volume
2-5 mL of venous blood
Stability
Refrigerated (2-8°C) for up to 7 days; frozen (-20°C or below) for longer storage up to 30 days
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
48–72 hours
Order
routine

What is this test?

The Acetaldehyde and Paraldehyde test is a blood test that checks for the presence of two specific substances in your serum (the liquid part of blood) or plasma. Acetaldehyde is a chemical produced when your body breaks down alcohol. Paraldehyde is a medication that was historically used as a sedative and to treat alcohol withdrawal symptoms.

How is the test performed?

A healthcare professional will draw a small blood sample from a vein in your arm using a needle. The blood is collected into a special tube and sent to a laboratory for analysis. The test looks for the presence or absence of acetaldehyde and paraldehyde, rather than measuring exact quantities.

Why might I need this test?

Your doctor may order this test if they suspect you have been exposed to acetaldehyde through alcohol consumption, certain industrial chemicals, or environmental sources. It may also be used to monitor individuals with a history of paraldehyde use or to help diagnose certain metabolic conditions. The test can help evaluate how well your body processes alcohol or determine if there has to recent exposure to these substances.

What do the results mean?

The results are reported as either 'Present' or 'Absent' for each substance. If a substance is detected (Present), it means it was found in your blood sample at a level the test can detect. If not detected (Absent), the substance either is not present or is present at a level below the test's detection threshold. Your doctor will interpret these results in the context of your symptoms, medical history, and other test findings.

Reference range

Not DetectedN/A

Specimen: serum

Avoid alcohol consumption for at least 24 hours before specimen collection. Inform the laboratory of any medications, supplements, or herbal products being taken.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

Do I need to fast before this test?
Typically, no fasting is required for this test. However, you should follow any specific instructions provided by your healthcare provider. Avoid alcohol consumption before the test if possible, as this could affect the acetaldehyde results.
Is the test painful?
You may feel a brief sting or pinch when the needle is inserted to draw blood. This is generally well tolerated. Some people may experience minor bruising at the injection site afterward, which usually resolves quickly.
How long does it take to get results?
Results are typically available within a few days, depending on the laboratory. Your healthcare provider will contact you with the results or discuss them at your follow-up appointment.
Are there any risks associated with this test?
The risks are minimal and similar to any standard blood draw. These may include slight bleeding, bruising, or infection at the puncture site. In rare cases, some people may feel lightheaded during or after the blood draw.
What happens if acetaldehyde or paraldehyde is detected?
If detected, your doctor will discuss what this means for your health. They may recommend additional tests, lifestyle changes, or treatments based on the findings. It is important to follow up with your healthcare provider to understand and address the results.
  1. 1
    MedlinePlus - Blood TestsSource
  2. 2
    Mayo Clinic - Laboratory Test GuideSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy