DIPSS Risk Calculator (Primary Myelofibrosis)
Enter patient values below to estimate the Dynamic International Prognostic Scoring System (DIPSS) risk category.
What is DIPSS?
DIPSS stands for Dynamic International Prognostic Scoring System. It is a clinical tool used to estimate risk in patients with primary myelofibrosis (PMF). The term “dynamic” means the score can be calculated not only at diagnosis, but also during follow-up visits.
Unlike a one-time baseline score, DIPSS helps clinicians re-assess prognosis as lab values and symptoms evolve over time. This can support discussions around observation, medical therapy, referral, and potential timing for advanced treatment decisions.
DIPSS scoring criteria
The calculator above uses the classic DIPSS factors and weights:
| Risk Variable | Threshold | Points |
|---|---|---|
| Age | > 65 years | +1 |
| Constitutional symptoms | Present | +1 |
| Hemoglobin | < 10 g/dL | +2 |
| Leukocyte count | > 25 ×109/L | +1 |
| Peripheral blood blasts | ≥ 1% | +1 |
Risk group mapping
- 0 points: Low risk
- 1–2 points: Intermediate-1 risk
- 3–4 points: Intermediate-2 risk
- 5–6 points: High risk
How to use this calculator
- Enter age, hemoglobin, leukocyte count, and peripheral blasts.
- Check the box if constitutional symptoms are present.
- Click Calculate DIPSS.
- Review the total score, risk category, and criterion-by-criterion breakdown.
Interpreting the result
The output gives an estimated prognostic group and a rough historical survival range from DIPSS-era cohorts. This estimate is for educational support and should always be interpreted with contemporary clinical context, molecular findings, and treating hematologist judgment.
DIPSS vs. IPSS vs. DIPSS-Plus
IPSS
Used at diagnosis only. Helpful baseline risk framework but not dynamic over time.
DIPSS
Uses the same core clinical variables but is designed for repeated use during disease course, making it more flexible for longitudinal management discussions.
DIPSS-Plus and modern models
DIPSS-Plus adds additional features (such as platelet count, transfusion status, and cytogenetics). Newer molecularly integrated models may further refine prognosis. In current practice, many centers combine clinical scores with genomic data for deeper risk assessment.
Practical caveats
- Lab values can fluctuate based on timing, hydration, treatment, or intercurrent illness.
- Symptoms should be assessed consistently (history quality matters).
- DIPSS is population-based and may not perfectly predict individual outcomes.
- Risk stratification is only one part of therapeutic planning.
Bottom line
A DIPSS calculator is a quick, structured way to summarize key prognostic variables in primary myelofibrosis. Use it as a communication and tracking tool, then integrate the result with full clinical and molecular evaluation for real-world decision-making.