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Beaumont Laboratory

Sheep Sorrell Weed (Allergen Specific IgE)

Rumex acetosella, Sheep Sorrell Weed (w18), Antrim #31995, EPIC: LAB5709, SOFT: ESHS

Specimen Collection Criteria

Collect: One Gold-top SST tube.

Twenty individual allergen assays or allergen screens can be performed on one 5 mL Gold-top SST tube. Each allergen assay requires 100 mcL of serum.

Physician Office/Drawsite Specimen Preparation

Let specimen clot 30-60 minutes then immediately centrifuge to separate serum from cells. Refrigerate (2-8°C or 36-46°F) the centrifuged collection tube within two hours of collection.

Preparation for Courier Transport

Transport: Centrifuged collection tube, refrigerated (2-8°C or 36-46°F).

Rejection Criteria

  • Plasma specimens.
  • Severely lipemic or hemolyzed specimens.


Specimen Stability for Testing:

Centrifuged SST Tubes and Microtainers® with Separator Gel
Room Temperature (20-26°C or 68-78.8°F): 2 hours
Refrigerated (2-8°C or 36-46°F): 7 days
Frozen (-20°C/-4°F or below): Unacceptable

Red-top Tubes and Microtainers® without Separator Gel
Room Temperature (20-26°C or 68-78.8°F): 2 hours
Refrigerated (2-8°C or 36-46°F): Unacceptable
Frozen (-20°C/-4°F or below): Unacceptable

Serum Specimens (Pour-Overs)
Room Temperature (20-26°C or 68-78.8°F): 2 hours
Refrigerated (2-8°C or 36-46°F): 7 days
Frozen (-20°C/-4°F or below): 1 month

Specimen Storage in Department Prior to Disposal:

Refrigerated (2-8°C or 36-46°F): 7 days


Royal Oak Special Testing Laboratory.


Monday - Friday.
Results available the next business day.

Reference Range

Allergy Reference Range: Less than 0.35 kU/L. 

Range (kU/L) Class Interpretation
Less than or equal to 0.34 0 Negative
0.35-0.69 1 Low
0.70-3.49 2 Medium
3.50-17.49 3 High
17.50-49.99 4 Very High
50.0-100.0 5 Very High
Greater than 100 6 Very High

Test Methodology

Fluorescence Enzyme Immunoassay (FEIA).


The allergen class may not be predictive of clinical disease in some patients. The diagnosis of allergy should be based upon patient history and clinical findings. The diagnosis of allergy should not be based upon laboratory findings alone.

Clinical Utility

Positive assay results indicate a high probability of allergic disease. Negative assay results effectively rule out allergy induced by those allergens.

Clinical Disease

Sheep sorrel is widespread throughout the United States. There is an increased incidence of sheep sorrel in the western half of the United States. Sheep sorrel blooms with the early grasses in the spring and flowers from May to July, except in California where it flowers year-round (1). There has been evidence that cross-reactivity can occur among different species of the genus. Sheep sorrel is commonly underestimated as a source of allergic reactions especially in large cities. Symptoms can include sneezing, wheezing, shortness of breath, itching of the nose, eyes, and palate, and watery nose and eyes. Allergy sufferers can be irritable and develop frequent headaches (1). Pollen has been shown as a potential source of seasonal urticaria (2).


  1. Kaplan, Allen P, M.D., Allergy. Churchill Livingstone: New York, 1985, pg. 272, 287.
  2. Korenblat, Phillip E. M.D., H. James Wedner, M.D. Allergy: Theory and Practice, 2nd ed., W. B. Saunders Company: Philadelphia, 1992, pg. 219.

CPT Code


Test Codes

Antrim #31995, EPIC: LAB5709, SOFT: ESHS

Last Updated


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This directory currently reflects information only for specimens collected and/or processed at the Farmington Hills, Grosse Pointe, Royal Oak, and Troy campuses.