Cobalt blood test
Quick answer: This test measures the level of cobalt, a metal, in your blood. Doctors order it mainly for people with metal-on-metal hip replacements or exposure at work.
- SampleBlood
- TakesAbout 5 minutes
- Before the testNo special preparation is usually needed.
How the test is done
- 1You tell staff about any metal joint replacement
- 2Blood is drawn into a metal-free tube
- 3The tube is sealed and labelled
- 4The sample is sent for trace metal testing
What your results can mean
Reading your report
Normal ranges differ between labs and by age and sex, so discuss your result with your doctor.
If the result is outside the usual range
A high level can be seen with wear of a metal-on-metal hip replacement, exposure at work, or high-dose supplements. Very high levels over time can affect the heart, nerves and thyroid.
Who usually has this test
People with metal-on-metal hip replacements, especially with pain or swelling around the joint, and workers exposed to cobalt.
Risks and aftercare
A small bruise at the needle site may appear and fade.
Names and options
Also called: cobalt level
Listed by the hospital as
- COBALT, BLOOD
Questions about this test
Why is cobalt checked after a hip replacement?
Some metal-on-metal hips release tiny metal particles as they wear. Blood cobalt helps doctors monitor the joint.
What symptoms can high cobalt cause?
It can cause pain around the joint, and at high levels problems with hearing, vision, nerves, the heart or thyroid. Many people have no symptoms.
How often is cobalt tested after a metal hip?
It depends on the type of implant and your symptoms. Your orthopaedic surgeon will advise on timing.
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Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
Get directions ↗IVF Pulse fertility care at Tamara Hospital →
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.