This section deals with the clinical condition
farmer's lung, listing the relevant immunological test, together
with a short explanation of its use.
Relevant immunological test: Farmer's lung precipitins
Hypersensitivity to Micropolysporium faeni is a common cause of
farmer's lung hypersensitivity pneumonitis occurring 12 to 24 hours
after exposure to mouldy hay. In some cases of farmer's lung,
hypersensitivity to other fungal species implicated.
The absence of precipitin (IgG) to Micropolysporium faeni does
not rule the diagnosis out. These antibodies can be found in some
healthy individuals: The presence of these antibodies supports, but
does not confirm, a diagnosis of farmer's lung.
There are numerous other causes of hypersensitivity pneumonitis
including fungal spores and occupational antigens. Please discuss
with the laboratory if these may be incriminated.
The diagnosis is made by a combination of clinical features,
X-ray and lung function tests.
(Last updated October 8th