# LOINC 7660-4 Rat muliialgro IgE Ab \[Units/volume\] in Serum

**URL:** <https://forum.loinc.org/t/loinc-7660-4-rat-muliialgro-ige-ab-units-volume-in-serum/2414>\
**Category:** General\
**Tags:** allergy\
**Created:** [February 18, 2025, 3:56pm UTC](https://forum.loinc.org/t/loinc-7660-4-rat-muliialgro-ige-ab-units-volume-in-serum/2414 "2025-02-18T15:56:05Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![js050784](https://forum.loinc.org/letter_avatar_proxy/v4/letter/j/a9a28c/32.png) [@js050784](https://forum.loinc.org/u/js050784)\
**Post date:** [February 18, 2025, 3:56pm UTC](https://forum.loinc.org/t/loinc-7660-4-rat-muliialgro-ige-ab-units-volume-in-serum/2414/1 "2025-02-18T15:56:05Z")

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[https://loinc.org/7660-4/](https://loinc.org/7660-4/)  
I was reviewing some of the allergy-related IgE codes and ran across LOINC code 7660-4. I’ve been unable to find what ‘rat muliialgro’ represents. Does anyone happen to know what this represents?

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**Author:** ![ehafeza](https://forum.loinc.org/letter_avatar_proxy/v4/letter/e/43a26b/32.png) [@ehafeza](https://forum.loinc.org/u/ehafeza)\
**Post date:** [February 25, 2025, 6:53pm UTC](https://forum.loinc.org/t/loinc-7660-4-rat-muliialgro-ige-ab-units-volume-in-serum/2414/2 "2025-02-25T18:53:39Z")

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Hi Jeremy, From the LOINC code it looks like it is a very old concept. Searching in LOINC and references I honestly didn’t come across any relevant resource. I will check a little more and circle back. Thank you for your note.  
Eza

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**Author:** ![bgoldberg](https://forum.loinc.org/letter_avatar_proxy/v4/letter/b/ea5d25/32.png) [@bgoldberg](https://forum.loinc.org/u/bgoldberg)\
**Post date:** [January 29, 2026, 8:17pm UTC](https://forum.loinc.org/t/loinc-7660-4-rat-muliialgro-ige-ab-units-volume-in-serum/2414/3 "2026-01-29T20:17:09Z")

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There are no specific references to this term other than to LOINC. Without an allergen code it is difficult to know what this means but I did find this, “While “muliialgro” is an older or more technical term (sometimes used in international contexts to describe a specific mix or extract of rat-related allergens), this test is essentially checking for an **allergic sensitivity to rats**.” If this is the case then it probably refers to e87 Rat epithelium, serum proteins and urine proteins.

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**Author:** ![ehafeza](https://forum.loinc.org/letter_avatar_proxy/v4/letter/e/43a26b/32.png) [@ehafeza](https://forum.loinc.org/u/ehafeza)\
**Post date:** [February 2, 2026, 9:22pm UTC](https://forum.loinc.org/t/loinc-7660-4-rat-muliialgro-ige-ab-units-volume-in-serum/2414/4 "2026-02-02T21:22:46Z")

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Hi Bruce, I appreciate very much your response and input to this LOINC. I will take it to the Lab committee, and decide on the next steps.

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**Author:** ![js050784](https://forum.loinc.org/letter_avatar_proxy/v4/letter/j/a9a28c/32.png) [@js050784](https://forum.loinc.org/u/js050784)\
**Post date:** [February 6, 2026, 1:49pm UTC](https://forum.loinc.org/t/loinc-7660-4-rat-muliialgro-ige-ab-units-volume-in-serum/2414/5 "2026-02-06T13:49:41Z")

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Thank you both for helping to clarify this.