Precipitins, Aspergillus ABPS Precipitins
Code:
ASPF
Sample Type:
2mL Serum (Gel 5mL Yellow tube)
Ref Ranges/Units:
mg/L
< 40 mg/L. Reference range established by Sheffield PRU and verified in-house..
Turnaround:
10 – 14 Days
Frequency of Analysis: Every 2 weeks
Special Precautions/Comments:
Method: Fluoresence Enzyme Immunoassay (FEIA). Calibration: WHO IRP 67/86 for IgG. EQA Scheme: UK NEQAS scheme for Antibodies to Fungal and Related Antigens. IQC: In house preparation and kit control
Interferences: None known.
Interpretation: < 40 mg/L NEGATIVE. > 40 mg/L POSITIVE
Additional Information:
Indication: Allergic bronchopulmonary aspergillosis (ABPA) and extrinsic allergic alveolitis (EAA).
Background Information: Aspergillus precipitins can be found in cases of allergic bronchopulmonary aspergillosis (ABPA) and extrinsic allergic alveolitis (EAA). Specific IgE to aspergillus should alsobe tested. ABPA occurs predominantly in patients with asthma, but is also a known complication of cystic fibrosis (CF) [1]. This chronic relapsing disorder ranges clinically from mild asthma to fatal destructive lung disease and is caused by hypersensitivity to colonized Aspergillus fumigatus [3]. The measurement of aspergillus precipitins may also be useful in the diagnosis of hypersensitivity pneumonitis [2]. The UK cysticfibrosis trust have made a list of diagnositic criteria for the diagnosis of ABPA in CF patients [1].
A positive test should not be, of itself, interpreted as representing a pathologic state. It may simply reflect a normal immune response to a prior or ongoing exposure to the antigen in question. Nor does the absence of precipitins eliminate the diagnosis since precipitins are reduced or absent when the disease is not in an acute state
References: Thia LP and Balfour Lynn IM. Diagnosing allergic bronchopulmonary aspergillosis in children with cystic fibrosis. Paed Res Rev. 2009. 10:37-42. [Ref 1] Berna P, et al. Pulmonary sequestration and aspergillosis. Eur J Cardiothorac Surg. 2005. 27(1):28-31. [Ref 2] Shah A and Chandramani P. Allergic bronchopulmonary aspergillosis: A review of a disease with a worldwide distribution. J Asthma. 2002. 39(4):273-289. [Ref 3]
Telephone Gateshead Lab: 0191.4456499 Option 4, Option 1