Lab test

Penicillin G Allergy Test - Drug Allergy

A penicillin G-specific IgE blood test measures antibodies the immune system may produce against penicillin G, also called benzylpenicillin or penicilloyl G.

Typical price

From $49

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

A penicillin G-specific IgE blood test measures antibodies the immune system may produce against penicillin G, also called benzylpenicillin or penicilloyl G. It is a screening tool used when a person has had a reaction after taking a penicillin antibiotic, or when a clinician wants to assess sensitization before prescribing one. Results are interpreted alongside the person's symptom history; the test does not confirm or exclude a drug allergy by itself.

• Penicillin G-specific IgE Antibodies produced in response to penicillin G (benzylpenicillin) that may indicate sensitization to the drug.

• You had hives, rash, swelling, or other symptoms after taking a penicillin antibiotic.
• You were told in the past that you are allergic to penicillin and want to clarify your status.
• A clinician is considering a penicillin-class antibiotic and wants additional information.
• You have a history of recurrent or unexplained reactions after antibiotic use.

• No fasting is required for this IgE antibody test.
• The sample can be collected at any time of day.
• Tell the clinician about antihistamines, corticosteroids, or other medications you take.
• Continue prescribed medications unless a healthcare provider advises otherwise.

An elevated penicillin G-specific IgE level may indicate that the immune system has been sensitized to penicillin G and can be associated with an increased likelihood of an allergic reaction. A normal result does not rule out a drug allergy, because some reactions are not IgE-mediated. The result is best interpreted together with your symptom history and the timing of any prior reaction. Discuss the findings and any concerns with a healthcare provider before making decisions about antibiotics.

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