What Are the Risks of a Lung Ventilation/Perfusion
Scan?
Lung ventilation/perfusion (VQ) scans involve little
risk for most people. The radioisotopes used for both tests expose you to a
small amount of radiation. The amount of radiation in the gas and injection
together are about the same as the amount a person is naturally exposed to in 1
year.
Although rare, the radioisotopes may cause an
allergic reaction.
Radiation
The radiation from the radioisotopes used in VQ
scans leaves the body after a few days.
Exposure to radiation is associated with a risk of
cancer. However, it’s not known whether the amount of radiation from a VQ
scan puts you at higher risk than the amount of radiation you’re
naturally exposed to.
You and your doctor will decide whether the benefits
of a VQ scan outweigh any possible risks. Your doctor also will try to avoid
ordering repeated VQ scans over a short period.
If you’re pregnant or breast-feeding, talk to
your doctor about the risk of radiation related to this test. He or she will
consider whether another test can be used instead.
Allergic Reaction
Very rarely the radioisotopes used in VQ scans can
cause an allergic reaction. Hives or a rash may result. Medicines can relieve
this reaction. |