How accurate is the ADA diabetes risk test at finding undiagnosed diabetes?

The ADA risk test catches roughly 7 or 8 in 10 people with undiagnosed diabetes at best, and most who score high don't have it. Few studies tested the ADA score itself.

Who it's for

Adults wondering whether to get a blood test; not a diagnosis.

What to expect

It misses some cases and flags many people who are fine.

Watch out for

A low score can falsely reassure; only blood tests confirm diabetes.

What the studies show

• The best direct evidence on the ADA questionnaires is a US survey-based study of adults aged 20 and older. It compared them with other screening methods. Sensitivity (the share of true cases caught) ranged from 44% to 100% across the comparison tools, and specificity (the share of healthy people correctly cleared) from 10% to 73%. Only 5% to 8% of those flagged actually had diabetes5Observational study · 2009Development and validation of a patient self-assessment score for diabetes risk.This easy-to-implement diabetes screening score seems to demonstrate improvements over existing methods. Studies are needed to evaluate it in diverse populations in real-world settings.Ann Intern Med.
• The same study's own new score caught 72% to 79% of cases. About 10% of people flagged had diabetes, and 35% to 40% of adults were sent for testing5Observational study · 2009Development and validation of a patient self-assessment score for diabetes risk.This easy-to-implement diabetes screening score seems to demonstrate improvements over existing methods. Studies are needed to evaluate it in diverse populations in real-world settings.Ann Intern Med. That makes it a modest improvement, from one study design with no real-world testing.
• A review of 32 studies of the Finnish FINDRISC score, a similar questionnaire, found it caught about 53% to 85% of cases depending on the cut-off. Between 22% and 55% of people without diabetes were wrongly flagged. It fits the ADA score only loosely2Meta-analysis · 2025Finnish diabetes risk score (findrisc) for type 2 diabetes screening compared with the oral glucose tolerance test: A systematic review and meta-analysis of diagnostic test accuracy.The FINDRISC scores of 9 and 10 points show the best effectiveness for screening T2D, with moderate and low quality of evidence respectively. Although the cut-off of 12 points has lower sensitivity, it significantly reduces the FPR and increase the specificity with moderate quality of evidence.Diabetes Res Clin Pract.
• Other questionnaires in several countries caught about 76% to 81% of undiagnosed cases, with about 72% to 77% specificity. Only about 5% to 13% of high scorers had diabetes6Observational study · 2003 · 4,435 peopleThe diabetes risk score: a practical tool to predict type 2 diabetes risk.The Diabetes Risk Score is a simple, fast, inexpensive, noninvasive, and reliable tool to identify individuals at high risk for type 2 diabetes.Diabetes Care,9Observational study · 2000 · 1,077 peopleDiabetes risk score: towards earlier detection of type 2 diabetes in general practice.A simple score, using only data that are routinely collected in general practice, can help identify those at risk of diabetes. This score could contribute to efficient earlier detection through case-finding or targeted screening.Diabetes Metab Res Rev,10Observational study · 2004 · 6,784 peopleA Danish diabetes risk score for targeted screening: the Inter99 study.We developed a questionnaire to be used in a stepwise screening strategy for type 2 diabetes, decreasing the numbers of subsequent tests and thereby possibly minimizing the economical and personal costs of the screening strategy.Diabetes Care.
• Accuracy varies by group. In Hispanic adults in the US, three studies found fair performance, but too few exist to be sure3Systematic review · 2018Diabetes risk scores for Hispanics living in the United States: A systematic review.Efforts to develop and validate risk prediction models in Hispanic populations in the U.S are needed, particularly given the diversity of thisfast growing population. Healthcare professionals should be aware of the limitations of applying risk scores developed for the general population on Hispanics.Diabetes Res Clin Pract. In Jordan, FINDRISC predicted high blood sugar better than the ADA score7Observational study · 2021 · 392 peopleAdapting Diabetes Risk Scores for Jordan.FINDRISC risk score performed the best compared to other risk scores for predicting pre-diabetes, diabetes, and absence of diabetes. We recommend using the FINDRISC risk score assessment in Jordan.Int J Gen Med.
• A review of 94 risk models found many had weak or incompletely reported accuracy, with notable false positives and false negatives. Results could not be pooled1Systematic review · 2011Risk models and scores for type 2 diabetes: systematic review.Much work has been done to develop diabetes risk models and scores, but most are rarely used because they require tests not routinely available or they were developed without a specific user or clear use in mind. Encouragingly, recent research has begun to tackle usability and the impact of diabetes risk scores. Two…BMJ.

These percentages compare groups. How much a score helps one person depends on how likely diabetes was to begin with.

Key studies

Safety

The tests carry no direct physical risk. A false negative could delay a diagnosis. In one Danish study, people missed by the score had less heart disease risk than those correctly flagged (11.3% vs 20.4%)10Observational study · 2004 · 6,784 peopleA Danish diabetes risk score for targeted screening: the Inter99 study.We developed a questionnaire to be used in a stepwise screening strategy for type 2 diabetes, decreasing the numbers of subsequent tests and thereby possibly minimizing the economical and personal costs of the screening strategy.Diabetes Care.

What we don't know

• How well the current ADA score performs in recent, varied populations, since most evidence covers other scores.
• Whether using a risk score instead of testing everyone improves health outcomes8Systematic review · 2014How diabetes risk assessment tools are implemented in practice: a systematic review.The current use of non-invasive diabetes risk assessment scores as screening tools appears to be limited. Practical follow up systems as well as strategies to address other barriers to the implementation of diabetes risk assessment tools are essential and need to be developed.Diabetes Res Clin Pract.