What tests should I get after a MDS diagnosis

Tests After an MDS Diagnosis

After being diagnosed with Myelodysplastic Syndrome (MDS), your healthcare team will order several important tests to understand your specific disease and guide treatment decisions. Let me walk you through what to expect and why these tests matter.

Initial Diagnostic Tests (If Not Already Done)

Bone Marrow Biopsy and Aspiration This is the foundation of MDS diagnosis. Your doctor removes a small sample of bone marrow (usually from your hip bone) to examine the cells under a microscope. This shows:

• How many abnormal cells are present
• What type of cells are affected
• The overall cellularity (how crowded the marrow is)

Cytogenetics (Chromosome Analysis) Lab technicians examine your bone marrow cells' chromosomes to look for specific abnormalities. This is crucial because certain chromosome changes help determine your MDS subtype and risk level.

Flow Cytometry This test uses special dyes and lasers to identify and count different types of blood cells in your bone marrow. It helps detect abnormal cell populations that may not be visible under a regular microscope.

Ongoing Monitoring Tests

Complete Blood Count (CBC) You'll have this blood test regularly—typically every 1-3 months depending on your disease stage. It measures:

• Red blood cells (hemoglobin and hematocrit)
• White blood cells
• Platelets

These numbers help your doctor track disease progression and watch for anemia or infection risk.

Comprehensive Metabolic Panel This checks kidney function, liver function, and electrolytes—important because some MDS treatments can affect these organs.

Lactate Dehydrogenase (LDH) Elevated LDH can indicate cell turnover and disease activity, so this baseline and follow-up measurement helps track your disease.

Specialized Tests for Risk Stratification

Molecular Testing (Gene Mutations) Your bone marrow cells may be tested for specific genetic mutations (like TP53, ASXL1, RUNX1, and others). These mutations help your doctor:

• Determine your risk category (low, intermediate, or high)
• Predict how quickly the disease might progress
• Guide treatment selection

Fluorescence In Situ Hybridization (FISH) This is a more detailed chromosome test that can detect smaller abnormalities that regular cytogenetics might miss.

Tests Before Starting Treatment

If your doctor recommends treatment, you'll likely need:

Baseline Organ Function Tests

• Cardiac assessment (EKG or echocardiogram) if considering certain chemotherapy drugs
• Renal function (creatinine, estimated GFR) since kidney function affects drug dosing
• Hepatic function (liver enzymes) for similar reasons

Infectious Disease Screening

• Hepatitis B and C testing
• HIV testing
• Other infections depending on your treatment plan

Periodic Reassessment

Once you're on a treatment plan, your doctor will order:

• Repeat bone marrow biopsies (typically every 3-6 months initially, then as needed) to assess response to treatment
• Repeat cytogenetics/molecular testing if there's concern about disease progression or transformation to acute leukemia

Questions to Ask Your Oncologist

1. "Based on my initial test results, what is my MDS risk category, and what does that mean for my prognosis?"
2. "Which of these tests do I need repeated, and how often?"
3. "Are there any genetic mutations in my cells that might affect treatment options?"
4. "What symptoms or test result changes should prompt me to contact you between appointments?"
5. "Do you recommend any additional specialized testing (like molecular profiling) to help guide treatment decisions?"

Why This Matters

These tests serve two main purposes: they establish a baseline of your disease at diagnosis, and they track how your MDS is changing over time. This information helps your doctor decide whether to "watch and wait" (for lower-risk MDS) or start treatment (for higher-risk disease). The tests also help catch any transformation toward acute leukemia early, which is important for your long-term care plan.

Your healthcare team will explain which tests are most relevant for your specific MDS subtype and risk level. Don't hesitate to ask for clarification about any test results—understanding your disease is an important part of managing it.

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