Carcinoembryonic Antigen (CEA)
How It Feels
The blood sample is taken from a vein in
your arm. An elastic band is wrapped around your upper arm. It may feel tight.
You may feel nothing at all from the needle, or you may feel a quick sting or
There is very little chance of a problem from
having blood drawn from a vein.
- You may get a small bruise at the site. You can
lower the chance of bruising by keeping pressure on the site for several
- In rare cases, the vein may become swollen after the
blood sample is taken. This problem is called phlebitis. A warm compress can be
used several times a day to treat this.
- Ongoing bleeding can be a
problem for people with bleeding disorders. Aspirin, warfarin (Coumadin), and
other blood-thinning medicines can make bleeding more likely. If you have
bleeding or clotting problems, or if you take blood-thinning medicine, tell
your doctor before your blood sample is taken.
The carcinoembryonic antigen (CEA) test
measures the amount of this
protein that may appear in the blood of some people
who have certain kinds of cancers, especially cancer of the large intestine (colon and rectal cancer). It may also be present in people with cancer of the
pancreas, breast, ovary, or lung.
are usually available in 1 to 3 days.
The normal values listed here—called a reference range—are just a guide. These ranges vary from lab to lab, and your lab may have a different range for what's normal. Your lab report should contain the range your lab uses. Also, your doctor will evaluate your results based on your health and other factors. This means that a value that falls outside the normal values listed here may still be normal for you or your lab.
Many conditions can change your CEA levels. Your
doctor will discuss any significant abnormal results with you in relation to
your symptoms and medical history.
Most cancers do not produce
this protein, so your CEA may be normal even though you have cancer.
- Cancer of the colon, lung, pancreas, breast,
or ovary may be present.
- Cancer may not be responding to
- Cancer may have returned after treatment. A steadily
rising CEA may be the first sign that cancer has come back after treatment.
Also, people with advanced cancer or cancer that has spread to other parts of
the body (metastatic cancer) may have high CEA levels if their original cancer
produced this protein before treatment.
- Another condition or
disease is present, such as
hepatitis, diverticulitis, inflammatory bowel disease,
peptic ulcer disease,
chronic obstructive pulmonary disease (COPD), inflammation of the gallbladder (cholecystitis), or an
obstructed bile duct.