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Letter to the Editor
2010:76:4;413-415
doi: 10.4103/0378-6323.66588
PMID: 20657128

Comparison of commercial histamine release test and autologous serum skin test in the diagnosis of autoimmune urticaria

KV Godse, NJ Nadkarni, G Jani
 Rajawadi Hospital, Ghatkopar, Mumbai, India

Correspondence Address:
K V Godse
Rajawadi Hospital, Ghatkopar, Mumbai
India
How to cite this article:
Godse K V, Nadkarni N J, Jani G. Comparison of commercial histamine release test and autologous serum skin test in the diagnosis of autoimmune urticaria. Indian J Dermatol Venereol Leprol 2010;76:413-415
Copyright: (C)2010 Indian Journal of Dermatology, Venereology, and Leprology

Sir,

Chronic idiopathic urticaria (CIU) is a rather common skin disorder characterized by the recurrent eruption of short-lived wheals accompanied by redness and itching for at least six weeks. [1] About 30-50% of patients with CIU have circulating histamine-releasing auto antibodies to the high-affinity IgE receptor Fc RI on basophils and mast cells or, less commonly, antibodies to IgE. [2] The term autoimmune urticaria is increasingly being accepted for this subgroup of patients. The autologous serum skin test (ASST) is currently the best in vivo clinical test for detection of in vitro basophil histamine-releasing activity. [3] The gold standard laboratory test for autoimmune chronic urticaria is the demonstration and measurement of histamine release from target basophils of dermal mast cells. [4] A commercial histamine release test (HR-Test; RefLab, Copenhagen, Denmark) has become available.

We studied 20 patients (Nine males and 11 females, Age group 10 to 65 years, Mean age 33.2 years) with chronic urticaria and positive ASST and no underlying infections with the HR-Test. We found ASST test positive in 20 patients out of 45 patients tested with ASST. Patients were advised to stop antihistamines and steroids for two days, and doxepin for three weeks before the test. The ASST was performed by injecting 0.05 ml of the patient′s own serum intradermally into the left flexor forearm 2 inches below the antecubital crease and a saline control 2 inches away. A reading of the wheal was taken after 30 min. A wheal and flare more than 1.5 mm in diameter than that of the control was considered positive.

The age, sex, type of urticaria, underlying diseases and the medication used by the patients are shown in [Table - 1]. Duration of urticaria ranged from six to 60 months. Average duration was 23.55 months. Antihistamines were withdrawn two days prior to skin tests. Serum aliquots from the patients were frozen and sent to RefLab. Fifty per cent, 25% and 12.5% serum dilutions were incubated with dextran-sedimented basophils from healthy donors and histamine release of over 16.5% was considered positive. The donor basophils were selected on the basis of a histamine release response to anti-IgE and a panel of positive donors releasing over 30% of the cellular histamine content. Histamine is determined by the fluorometric o-Phthal-di-aldehyde method. The assay is calibrated by a two-point standard curve and a positive cell control (anti-IgE). Test results are classified in Classes 0, 1, 2 and 3 (standardized allergens) or reported as negative or positive. In the laboratory serum and donor basophils are incubated and the % histamine release is detected. A histamine release of more than 16.5% is a positive test result.

The sera of nine patients (six females and three males) out of 20 (45%) showed a positive HR-Test result. To our knowledge, comparisons between the ASST and the commercial HR-Test of Reflab have not been published from India. A similar study published from Finland shows that four out of 10 patients had positive HR-Test. [5]

These results indicate that ASST is not a specific test and HR-Test should be done to diagnose autoimmune urticaria. ASST still remains a baseline test to detect the autoimmune nature of urticaria. Larger studies are required to validate these findings.

Acknowledgement

Authors wishes to thank RefLab Denmark for doing HR Test free of cost for research purpose

References
1.
Greaves M. Chronic urticaria. J Allergy Clin Immunol 2000;105:664-72.
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Godse KV. Autologous serum skin test in chronic idiopathic urticaria. Indian J Dermatol Venereol Leprol 2004;70:283-4.
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3.
Grattan CE, Sabroe RA, Greaves MW. Chronic urticaria. J Am Acad Dermatol 2002;46:645-57.
[Google Scholar]
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Greaves MW. Chronic idiopathic urticaria. Curr Opin Allergy Clin Immunol 2003;3:363-8.
[Google Scholar]
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Hyry H, Elg P, Ranki A. A commercial histamine release test and autologous serum skin test in the diagnosis of autoimmune urticaria. Allergy 2006;61:1147-8.
[Google Scholar]

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