MODY Calculator

MODY (Maturity-Onset Diabetes of the Young) is a rare, inherited form of diabetes that is often misdiagnosed as type 1 or type 2. This calculator provides an educational screening estimate to help identify when genetic testing for MODY may be worth discussing with a healthcare professional.3

MODY Calculator – Screening Score (Educational)

Estimate whether your profile has low, moderate, or high suspicion for MODY (Monogenic diabetes – Maturity-onset diabetes of the young).2 Educational only—confirm next steps with your clinician or a genetics team.

Profile
Glucose units
Earlier diagnosis can increase suspicion for MODY.
Used for context only.
Lower BMI (not obese) can increase suspicion.
Optional—adds context, not diagnostic.
Units: mg/dL
MODY often runs through generations.
Family clustering adds support.
Early insulin need can suggest type 1, but overlap exists.
Negative antibodies can increase MODY suspicion.
Preserved insulin production supports non–type 1 patterns.
Incomplete
Enter values, then Calculate

This tool provides a screening-level estimate, not a diagnosis.

What you’ll get
  • Low / Moderate / High MODY suspicion
  • A point-based summary of which features drove the result
  • Suggested “next questions” to ask your clinician
Important
  • Genetic testing decisions are individualized.
  • Symptoms and labs can overlap with type 1 and type 2 diabetes.
  • Always follow your clinician’s diagnosis and treatment plan.
How scoring works (transparent)

Points are added for features commonly associated with MODY (earlier diagnosis, strong family history, not obese, negative antibodies, preserved C-peptide, and not needing insulin early). This is a rule-based screen designed for clarity—not a validated probability model.1

Cite This Calculator

If you reference or embed this MODY Calculator, please cite it as an educational screening tool.

DiabetesKnow. MODY Calculator – Monogenic Diabetes Screening Tool. https://diabetesknow.com/health-tools/mody-calculator/
Alternative citation formats

APA:
DiabetesKnow. (2026). MODY Calculator – Monogenic Diabetes Screening Tool. https://diabetesknow.com/health-tools/mody-calculator/

MLA:
DiabetesKnow. “MODY Calculator – Monogenic Diabetes Screening Tool.” DiabetesKnow, https://diabetesknow.com/health-tools/mody-calculator/

Chicago:
DiabetesKnow. “MODY Calculator – Monogenic Diabetes Screening Tool.” https://diabetesknow.com/health-tools/mody-calculator/

FAQs

MODY is caused by a single-gene mutation that alters insulin regulation rather than autoimmune destruction or lifestyle-driven insulin resistance. This inherited pattern often follows autosomal dominant transmission, meaning multiple generations in the same family may develop diabetes with similar clinical features.

This calculator estimates whether a person’s clinical profile resembles patterns commonly seen in monogenic diabetes. It does not diagnose diabetes type, measure autoimmune diabetes, or assess insulin-resistant diabetes, and should be used only as an educational screening aid for awareness.

MODY is often suspected when diabetes appears at a young age, affects multiple relatives across generations, and occurs alongside preserved insulin production. The absence of diabetes autoantibodies further increases clinical suspicion during formal clinical evaluation.

Because MODY can present with mild, stable hyperglycemia, it may resemble other classifications, including autoimmune diabetes or insulin resistance patterns. Without genetic testing, the inherited nature of MODY is easy to overlook early in routine care.

Correctly identifying MODY can influence treatment selection, long-term monitoring, and family counseling. Some MODY subtypes respond well to specific oral therapies, while others require minimal intervention, making accurate classification important for personalized diabetes management decisions.

Learn more about Maturity-Onset Diabetes of the Young, and our other Health Tools!

Clinical References & Methodology

  1. Shields BM, et al.
    Development and validation of clinical prediction models to calculate an individual’s probability of MODY.
    Diabetologia, 2012.
    Establishes the MODY clinical prediction model using age of diagnosis, BMI, treatment history, and family history—forming the foundation of modern MODY probability calculators.
    View source Back to content ↑
  2. da Silva Santos T, et al.
    Utility of the MODY Probability Calculator in selecting individuals for genetic testing.
    Endocrinology, Diabetes & Metabolism, 2022.
    Real-world validation study evaluating calculator performance, cutoff thresholds, and clinical usefulness for guiding MODY genetic testing decisions.
    View source Back to content ↑
  3. NHS England – DiabetesGenes Programme
    Guidelines for genetic testing in MODY.
    Official clinical guidance outlining when MODY probability scores and phenotypic features should prompt genetic testing.
    View source Back to content ↑