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Cancer Antigen 125 (CA-125)

How It Feels

The elastic band around your upper arm may feel tight. You may feel nothing at all from the needle, or you may feel a quick sting or pinch.

Risks

There is very small chance of problems from having blood drawn from a vein.

  • You may get a small bruise at the site. You can lower your chance of bruising by putting pressure on the site for several minutes.
  • In rare cases, the vein may become swollen after the blood sample is taken. This condition is called phlebitis. You can use a warm compress 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 also make bleeding more likely. If you have bleeding or clotting problems, or if you take blood-thinning medicine, tell your health professional before your blood is drawn.

Results

The cancer antigen 125 (CA-125) test measures the amount of the CA-125 protein in the blood.

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.

Cancer antigen 125 normal values 1
Normal:

Less than 35 units per milliliter (U/mL)

Less than 35 kiloUnits per liter (kU/L) (SI units)

High values

WebMD Medical Reference from Healthwise

Last Updated: May 29, 2013
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.

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