What the risks are:

Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.

Other risks may include:

• Excessive bleeding
• Fainting or feeling light-headed
• Hematoma (blood accumulating under the skin)
• Infection (a slight risk any time the skin is broken)

Special considerations:

This test is about 80% accurate for identifying the specific locations of cancers or disease. However, it is not a reliable screening test because levels may be high for unknown reasons and return to normal. Unless there are signs of a disease, higher-than-normal values of ALP in the Chem-20 test are not considered significant.