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Dermatophagoides pteronyssinus (Der p 1) IgE Antibody, RAST — Qualitative

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

A qualitative blood test that detects IgE antibodies to the Der p 1 allergen in dust mites, helping assess allergic sensitization.

Quick summary

["A positive result indicates an immune reaction to dust-mite Der p 1, but it must be interpreted with your symptoms and medical history."]

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

Key facts at a glance

LOINC
81972-2
Short code
Deprecated D pteronyss (nDer p) 1 IgE RAST Ql
Synonyms
Deprecated D pteronyss (nDer p) 1 IgE RAST Ql
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
10
Ref high
40
Critical range
— – 5 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84484
SNOMED
302774002
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What is this test?

This is a qualitative blood test for IgE antibodies against Der p 1, an allergen found in house dust mites. Dermatophagoides pteronyssinus is the dust-mite species most commonly associated with this allergen.

Why might I need this test?

Your clinician may order this test when you have symptoms such as sneezing, congestion, itchy eyes, wheezing, or a rash that could be caused by dust-mite allergy. It may also help identify which dust-mite allergen is triggering your symptoms.

How is the test performed?

A blood sample is collected and analyzed to determine whether IgE antibodies to Der p 1 are present. The result is generally reported as positive or negative rather than as a measured concentration.

How do I prepare for the test?

No special preparation is usually required. Tell your clinician about your allergy symptoms, recent allergen exposure, and any medicines or allergy treatments you are using, but do not stop them without medical advice.

Reference range

Adult: 10-40 U/LN/A

Specimen: serum

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Der p 1 IgE (RAST)

Frequently asked questions

Does a positive result mean I am allergic to dust mites?
It indicates sensitization to Der p 1, but your clinician must determine whether this allergen is clinically relevant by considering your symptoms and exposure history.
Can this test identify all dust-mite allergies?
No. It specifically evaluates antibodies to Der p 1; other dust-mite allergens may require separate testing.
Should I stop allergy medicine before the test?
Do not stop medicines without instructions from your clinician. Some allergy treatments can affect test interpretation, so discuss all current and recent treatments with your care team.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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