Lab test

Penicillin V Allergy Test - Drug Allergy

This test measures IgE antibodies directed against penicillin V, also known as phenoxymethylpenicillin or penicilloyl V.

Typical price

From $49

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

This test measures IgE antibodies directed against penicillin V, also known as phenoxymethylpenicillin or penicilloyl V. It is used to evaluate possible sensitization to penicillin V after a suspected reaction or when a clinician needs more information before recommending a penicillin antibiotic. It is a screening tool that is interpreted together with clinical history rather than on its own. Testing is most useful when interpreted alongside the timing and nature of any previous reaction.

• Penicillin V-specific IgE Antibodies produced in response to penicillin V (phenoxymethylpenicillin) that may indicate sensitization.

• You developed a rash, hives, or swelling after taking penicillin V.
• You have a documented penicillin allergy and want to understand your sensitization status.
• A clinician is deciding whether a penicillin-class antibiotic is appropriate.
• You have recurring symptoms that occur after taking oral antibiotics.

• No fasting is needed before this IgE antibody test.
• Collection can occur at any time of day.
• Report antihistamines, steroids, or immunosuppressive medications to the clinician.
• Do not stop prescribed medications unless a healthcare provider tells you to.

An elevated penicillin V-specific IgE may indicate sensitization to penicillin V and can be associated with a greater chance of an allergic reaction. A low or undetectable level does not prove the absence of allergy, because non-IgE reactions are not captured by this test. A healthcare provider should interpret the result with your reaction history; discuss any positive or negative findings before changing how you use antibiotics.

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