Reasons you may not be able to
have the test or why the results may not be helpful include:
Taking certain medicines. Be sure your doctor knows all of the medicines you take. Some medicines that affect test results include ones used for birth control, heart failure, seizures, and rheumatoid arthritis.
Getting vaccinations (immunizations),
especially vaccinations with repeat (booster) doses, in the past 6
Using alcohol or illegal drugs.
Having had a
radioactive scan in the past 3 days.
What To Think About
Immunoglobulins are made specific to different
illnesses. For example, the
IgM antibody for mononucleosis is different than the
herpes. For this reason, a doctor can look for an
immunoglobulin to a specific illness to help diagnose that
Different antibodies can be used to help a doctor tell the
difference between a new and past infection. For example, IgM antibodies for
mononucleosis with or without IgG antibodies means a new mono infection. IgG
antibodies without IgM means a past mono infection.
very low immunoglobulin levels, especially IgA, IgG, and IgM, have a higher
chance of developing an infection.
A very small number of people
cannot make IgA and have a higher chance of developing a potentially
life-threatening reaction to a blood transfusion.