Serum chromium is a test for increased levels of chromium in the blood.
How the test is performed: Blood is drawn from a vein, usually from the inside of the elbow or the back of the hand. The puncture site is cleaned with antiseptic. An elastic band is placed around the upper arm to apply pressure and cause the vein to swell with blood.
A needle is inserted into the vein, and the blood is collected in an air-tight vial or a syringe. During the procedure, the band is removed to restore circulation. Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding.
In infants or young children:
The area is cleansed with antiseptic and punctured with a sharp needle or a lancet. The blood may be collected in a pipette (small glass tube), on a slide, onto a test strip, or into a small container. A bandage may be applied to the puncture site if there is any bleeding.
How to prepare for the test: No special preparation is necessary for this test.
How the test will feel: When the needle is inserted to draw blood, you feel moderate pain, or only a prick or stinging sensation. Afterward, there may be some throbbing.
Why the test is performed: Your health care provider may perform this test to detect chromium toxicity.
Normal Values: Serum chromium levels normally range from less than 0.05 up to 0.5 micrograms/milliliter
The range of normal values is dependent upon the type of specimen tested and may vary between different laboratories. The laboratory performing the test should be consulted for their normal range of values.
What abnormal results mean: Increased chromium levels may result from overexposure in the following industries:
- Leather tanning
- Electroplating
- Steel manufacturing
What the risks are: Risks associated with having blood drawn are slight:
- Excessive bleeding
- Fainting or feeling light-headed
- Hematoma (blood accumulating under the skin)
- Infection (a slight risk any time the skin is broken)
- Multiple punctures to locate veins
Special considerations: 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.
Test results may be altered if the sample is collected in a metal tube.
