Saccharomonospora viridis Precipitating Antibodies, IgG

CPT: 86602
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Test Details


  • Hypersensitivity Pneumonitis
  • Thatched Roof Disease


Confirm the presence of precipitating antibodies to Saccharomonospora viridis


A positive test does not establish the diagnosis of hypersensitivity pneumonitis, nor does the absence of precipitins eliminate the diagnosis.


Double diffusion (Ouchterlony)

Reference Interval

Normal: negative

Additional Information

Hypersensitivity pneumonitis (HP), also referred to as extrinsic allergic alveolitis (EAA), is an inflammatory lung disease resulting from the inhalation and subsequent sensitization to a wide variety of inhaled organic dusts.1-5 Exposure to Saccharomonospora viridis can result from contact with dried grasses and leaves causing a condition referred to as thatched roof disease.1 HP is not mediated by IgE. It is associated with progressive pulmonary disability, irreversible lung damage, and mortality in some occupational settings.1-5 Patients often present with intermittent chills, fever, cough, and shortness of breath that begin four to eight hours after exposure to the offending dust.

No single laboratory test is diagnostic for hypersensitivity pneumonitis.1-5 Diagnosis is based on a complete environmental history supported by result of chest x-ray, spirometry, and in vitro immunologic tests.1-5 Identification of the causative agent is important to allow avoidance of exposure.2,5 Double diffusion (Ouchterlony) assays are typically used to determine antigen-specific IgG antibodies.5 The appearance of precipitin arcs confirms the presence of precipitating antibodies to specific antigens. These antibodies may also be present in individuals not afflicted with HP.2,3,5 The presence of antibodies to the offending dust or antigen confirms exposure but is not diagnostic of HP; however, upon repeated or prolonged exposures, high levels of precipitating IgG antibodies are typically observed.

Specimen Requirements




1 mL


Red-top tube or gel-barrier tube

Storage Instructions

Room temperature

Causes for Rejection

Excessive hemolysis

Clinical Information


1. Richerson HB, Bernstein IL, Fink JN, et al. Guidelines for the clinical evaluation of hypersensitivity pneumonitis. Report of the Subcommittee on Hypersensitivity Pneumonitis. J Allergy Clin Immunol. 1989 Nov; 84(5 Pt 2):839-844. 2809034
2. Patel AM, Ryu JH, Reed CE. Hypersensitivity pneumonitis: Current concepts and future questions. J Allergy Clin Immunol. 2001 Nov; 108(5):661-670. 11692086
3. Kurup VP, Fink JN. Immunological tests for evaluation of hypersensitivity pneumonitis an allergic bronchopulmonary aspergillosis. In Rose NR, Hamilton RG, Detrick B, eds.Manual of Clinical Laboratory Immunology. 6th ed. Washington, DC: ASM Press;2002:910-919.
4. Zacharisen MC, Fink JN. Hypersensitivity pneumonitis. In Grammar LC, Greenberger PA, eds. Patterson's Allergic Disease. 6th ed. Philadelphia, Pa: Lippincott Williams and Wilkins; 2002:515-528.
5. Greer Laboratories Inc. Hypersensitivity Pneumonitis/Extrinsic Allergic Alveolitis. Technical Bulletin #47. Lenoir, NC: Greer; 2004.


Yi ES. Hypersensitivity pneumonitis. Crit Rev Clin Lab Sci. 2002 Nov; 39(6):581-629.12484500


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
660019 Saccharomonospora viridis Ab 5336-3 660019 Saccharomonospora viridis Ab 5336-3

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