What is the Cobalt (Blood) test?

The Cobalt (Blood) test measures the concentration of cobalt present in whole blood or serum. Unlike urine testing, which reflects recent exposure, blood cobalt levels provide insight into systemic absorption and circulating metal load.

Blood cobalt testing is particularly useful when assessing ongoing or chronic exposure, including exposure from metal-on-metal joint implants, occupational sources, or environmental contamination. It reflects cobalt that is actively present in the bloodstream and potentially affecting organs and tissues.

This test is widely used in clinical toxicology, orthopaedics, and occupational medicine.

Why do I need a Cobalt (Blood) test?

Measuring cobalt in blood helps determine whether cobalt exposure is systemic and persistent, rather than transient. It is especially important when symptoms are present or when long-term exposure is suspected.

You may need a Cobalt (Blood) test if you:

• Have a metal-on-metal hip or joint implant
• Are being monitored for implant wear or failure
• Have occupational exposure to cobalt
• Work in metal processing, manufacturing, or welding
• Have elevated cobalt in urine and need confirmation
• Have symptoms suggestive of metal toxicity
• Require baseline or follow-up metal monitoring

Symptoms that may prompt blood testing include:

• Fatigue or weakness
• Neurological symptoms (tingling, memory changes)
• Hearing or vision changes
• Cardiovascular symptoms
• Thyroid dysfunction (in higher exposure states)

Benefits of the Cobalt (Blood) test

• Assesses systemic cobalt exposure
  Reflects cobalt circulating in the body.
• Relevant for implant monitoring
  Standard test for metal-on-metal joint assessment.
• Supports chronic exposure evaluation
  Useful when long-term exposure is suspected.
• Clinically recognised toxicology marker
  Used in specialist medical monitoring.
• Complements urine cobalt testing
  Provides a fuller exposure picture.
• Useful for symptom investigation
  Helps link symptoms to metal exposure.
• Suitable for repeat monitoring
  Allows tracking of cobalt trends over time.
• Simple blood test
  Requires only a single blood sample.

Step by step – how the test works

You can access Cobalt (Blood) testing UK-wide through two options:

1. Clinic appointment
   Attend your nearest UK clinic, where a healthcare professional will take your blood sample.
2. At-home or hotel visit (£60 extra)
   A qualified phlebotomist comes to your home or hotel, so you don’t need to travel.

Your sample is analysed in an accredited UK laboratory, and results are delivered securely.

Your results explained

Low cobalt levels

Indicate no significant systemic cobalt exposure.

Typical UK reference range:

• < 1.0 µg/L (laboratory dependent)

Normal cobalt levels

Suggest background exposure within expected limits.

Typical UK interpretation:

• Within laboratory reference range

High cobalt levels

Suggest ongoing or excessive systemic exposure. Further evaluation of exposure source or implant integrity may be required.

Typical UK interpretation:

• Above laboratory reference range

Reference ranges vary depending on laboratory methodology and clinical context.