Insulin resistance and prediabetes risk test

What this test is

The Finnish Diabetes Risk Score — FINDRISC — comes out of work by Lindström and Tuomilehto published in Diabetes Care in 2003, built and validated on a Finnish population cohort followed for ten years. It does something unusual: it predicts who will develop type 2 diabetes without measuring anything in blood.

Two versions circulate and they are not the same instrument. The published paper scores seven items out of twenty and has no family-history question. The eight-question form everyone actually fills in, scored out of twenty-six, is the Finnish Diabetes Association's: it added family history and an over-64 age band, and it is the form that carries the five named risk bands. This calculator implements that form, and both sources are named under the scale.

That is why it spread. National screening programmes across Europe use it or a close derivative, precisely because a questionnaire and a tape measure cost nothing and can be handed to a whole population, and the people it flags are the ones worth spending a laboratory test on.

Insulin resistance is the process underneath type 2 diabetes, and it develops years before glucose becomes abnormal. A high score here does not mean you have diabetes; it means your body's situation resembles that of people who went on to develop it.

What it asks, and why each question is there

Age, because risk rises with it. Body mass index, computed here from your height and weight. Waist circumference, scored separately for men and women, because visceral fat around the organs behaves differently from fat elsewhere and is the fat most strongly tied to insulin resistance. Daily physical activity, because muscle is the main site of glucose disposal. Daily vegetables, fruit or berries, as a crude marker of diet quality.

Then three history questions, which carry the heaviest weights: blood-pressure medication, because hypertension and insulin resistance travel together; any previous finding of high blood glucose, the single strongest item in the score; and family history, weighted more heavily for a parent, sibling or child than for a grandparent or cousin.

The point totals are the published ones. They are shown to the calculator as data — nothing on this page rounds or reinterprets them.

How to measure your waist properly

This is the item people get wrong, and it is worth three or four points. Stand up. Find the point midway between your lowest rib and the top of your hip bone, which for most people is just above the navel — that is where the form says to measure. Put the tape around bare skin, horizontal all the way round. Breathe out normally and read it then: not while holding your breath, and not pulled tight enough to compress anything.

Measure trousers-off if you can; a waistband reading is not the same measurement. If you want the same number expressed as a ratio rather than points, the waist-to-height ratio calculator uses it directly.

When the score does not apply

It was validated in adults aged 35 to 64 in a Finnish population, and it performs less well outside that. The stated probabilities travel worst of all: a Norwegian cohort found roughly one in seven people scoring in the high band developed diabetes within ten years, against the one in three the Finnish form states. Read the band, not the fraction. Several South Asian, Middle Eastern and African populations also develop insulin resistance at lower body mass index and waist circumference than the thresholds here assume, so a low score is less reassuring in those groups.

One more thing about how it was built: the outcome it was trained on was diabetes that ended up being treated with medication, not diabetes found by screening. By construction it undercounts the undiagnosed.

It does not apply during pregnancy, where gestational diabetes screening is a separate process. It does not apply if you already have a diagnosis of diabetes — the question it answers has been answered. And it estimates risk over ten years, not your current state: someone with an already-abnormal fasting glucose can score modestly here, which is exactly why the "have you ever been told" question carries five points.

What a raised score is worth doing about

The honest answer is: get a blood test, and then act on the results rather than on the score. A fasting glucose or an HbA1c is inexpensive and settles the question the score can only estimate. If the result comes back in the prediabetes range, that is a stage at which change makes a measurable difference — what prediabetes actually means covers that.

Three of the eight items are things you can move: activity, daily vegetables and waist circumference. The fourth lever is not in the score at all, and it is the amount of carbohydrate arriving in one sitting — the glycemic load calculator is there for that. If waist is your main contributor, why belly fat is the hardest to shift explains the mechanism.