What blood tests are used to monitor Melanoma

Blood Tests for Melanoma Monitoring

Great question! Blood tests play an important role in melanoma care, though they're used differently depending on your stage and treatment. Let me explain what tests are typically used and why.

Primary Blood Test: LDH (Lactate Dehydrogenase)

LDH is the main blood test used to monitor melanoma. This enzyme is released when cells are damaged or dying. According to the NCCN Guidelines for Patients: Melanoma, elevated LDH levels can indicate:

• Cancer spread (metastasis)
• How advanced the disease is
• How well treatment is working

Your doctor will compare your LDH results to a normal range. Higher-than-normal levels may suggest the cancer is progressing, while stable or decreasing levels often indicate good treatment response.

When Blood Tests Are Used

For early-stage melanoma (stages 0-2):

• Blood tests are typically not routine after surgery
• Your care focuses more on physical skin exams and self-monitoring

For advanced melanoma (stages 3-4):

• LDH testing becomes more important
• Tests are usually done before starting treatment and then periodically during treatment
• Helps your doctor assess whether immunotherapy, targeted therapy, or other treatments are working

What Blood Tests DON'T Do

It's important to understand that blood tests alone cannot diagnose melanoma. According to NCCN Guidelines, melanoma diagnosis requires a skin biopsy (removing a small tissue sample to examine under a microscope). Blood tests support diagnosis and monitoring but don't replace biopsies.

Other Considerations

Your oncologist may also order:

• Complete blood count (CBC) - to check overall blood health, especially if you're receiving immunotherapy or other systemic treatments
• Liver and kidney function tests - to monitor how your body is tolerating treatment
• Biomarker testing (BRAF mutation status) - done on tumor tissue (not blood), which helps determine if targeted therapy options are available

Questions to Ask Your Care Team

1. What is my baseline LDH level, and what does it mean for my situation?
2. How often will I need blood tests during my treatment?
3. What LDH level would indicate my treatment is working?
4. Are there other blood tests I should have based on my specific stage and treatment plan?
5. Will you explain my blood test results at each visit?

Important Note

The NCCN Guidelines emphasize that blood tests are just one tool your oncologist uses. They work together with imaging tests (CT scans, PET scans), physical exams, and skin biopsies to give a complete picture of your cancer status. Your doctor will determine which tests are most appropriate for your specific situation based on your stage, treatment type, and individual risk factors.

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This information is for educational purposes only. Always consult your healthcare team for personalized medical advice and decisions.