Reynolds Risk Score Calculator
The formula
What the reynolds risk tells you
Ridker’s risk function adding inflammatory burden (hs-CRP) and premature family history to traditional variables — the model behind CANTOS-era thinking.
Calculation: Ridker 2007 women’s CHD risk function (Cox model with hs-CRP and family history). Enter your inputs and every substitution is shown below the result.
Reading the result
Where Reynolds exceeds PCE, the delta is usually CRP and inheritance: residual inflammatory risk.
Rules of thumb: 25th percentile CRP ~0.3, 75th ~1.9 mg/L; ≥2 drives inflammation credit
Limitations and best practice
CRP is a noisy single draw — use a median of two measurements; and the women’s and men’s coefficient sets are not interchangeable.
This calculator gives an estimate based on standard formulas; it is not professional financial, medical, legal or engineering advice. Verify anything you plan to act on with a qualified professional and your own records.
Frequently asked questions
Does CRP cause events?
Why isn’t Reynolds in guidelines?
Source & methodology
Ridker NEJM 2007/2008.
How Reynolds Risk Score works — and what your result really means
You want to know what the number requires, not just what it is; this page shows both. There are plenty of pages about Reynolds Risk Score; almost none of them show the working. This one does: the formula, every input, a fully computed example, and a sensitivity analysis calculated live from this engine’s own defaults.
In plain terms, Reynolds Risk Score answers the question "10-year CHD risk?". The measurement matters because it converts a situation that feels complicated — several inputs pulling in different directions — into a single number you can act on. Within Health & Medical, Clinical Calculators is the context where this figure is quoted most often, and professionals treat it as a first-pass screen rather than a verdict.
What makes Reynolds Risk Score worth calculating is not precision but position: it tells you which side of a threshold you are on, and by how much. A rough figure that settles the direction beats an elaborate one that never commits.
Every figure in the prose is generated by the engine rather than written beside it — the worked example resolves to 10-year CHD risk = 0.1% on the default inputs — which is the thread the rest of this guide pulls on.
The Reynolds Risk Score formula, explained
The engine implements a single stated model: Ridker 2007 women’s CHD risk function (Cox model with hs-CRP and family history). There is no hidden coefficient and no login-gated precision — the formula printed is the formula executed, which is also what makes the result citable.
Age (example value 55) is a numeric input whose unit is fixed by the label; a wrong unit is a wrong answer wearing a plausible disguise. Be precise about the boundary (exact date, start of month); time inputs decide the exponent in most formulas.
hs-CRP (mg/L) (example value 2) is a numeric input whose unit is fixed by the label; a wrong unit is a wrong answer wearing a plausible disguise. Take this figure from a label, a report or a prescription — never from a guess.
Total cholesterol (mg/dL) (example value 260) is a numeric input whose unit is fixed by the label; a wrong unit is a wrong answer wearing a plausible disguise. Take this figure from a label, a report or a prescription — never from a guess.
HDL (mg/dL) (example value 43) is a numeric input whose unit is fixed by the label; a wrong unit is a wrong answer wearing a plausible disguise. Take this figure from a label, a report or a prescription — never from a guess.
Systolic BP (mmHg) (example value 143) is a plain measured quantity — the unit shown in the label is the unit the formula expects. If you are unsure what belongs in this field, look at the printed steps: the substitution shows exactly how the engine uses it.
Smoker? (0/1) (example value 1) is a numeric input whose unit is fixed by the label; a wrong unit is a wrong answer wearing a plausible disguise. If you are unsure what belongs in this field, look at the printed steps: the substitution shows exactly how the engine uses it.
Parent MI before 60? (0/1) (example value 0) is a quantity rather than a category — precision here is cheap and worth having. This input feeds the formula directly; a defensible figure here is worth more than false precision anywhere else.
Sex (example value Female) is a choice rather than a quantity — pick the option that matches your situation, because the calculation path branches here. Replace the example with the figure from your own records — the tool recomputes instantly and the printed steps follow your numbers.
Reynolds Risk Score on the example inputs: the complete substitution
The tool prints its own working; this is the same arithmetic on the example values, reproduced so you can follow it by hand. Starting figures: Age, hs-CRP (mg/L), Total cholesterol (mg/dL), HDL (mg/dL). The endpoint of that chain is 0.1% of 10-year CHD risk, sitting in the “Reynolds adds hs-CRP and family history to the lipid ratio — the 0.1% here vs a similar PCE number is the inflammation-and-inheritance question made quantitative (women’s coefficient set shown; men’s differs)” band.
- Linear predictor with published women’s coefficients
- Risk = 1 − exp(−exp(LP))
- Result 0.1% — treatment thresholds mirror PCE logic
Inflammation term — elevated CRP. Read next to the headline, this is the figure that shows the shape of the trade-off.
Cholesterol/HDL ratio — 6.0. Read next to the headline, this is the figure that shows the shape of the trade-off.
Family-history bonus — absent. Compare it against the main result of 0.1% before drawing conclusions.
Women-first validation — RWS; men’s model differs. Compare it against the main result of 0.1% before drawing conclusions.
Re-running with your own figures is instant; re-running by hand once is the best way to know the tool is telling you the truth.
Reading the result: bands, zones and thresholds
The value above only becomes useful the moment you know what it is being measured against. The default case lands in the “Reynolds adds hs-CRP and family history to the lipid ratio — the 0.1% here vs a similar PCE number is the inflammation-and-inheritance question made quantitative (women’s coefficient set shown; men’s differs)” band, and bands are deliberately wide because real situations overlap. The practical reading rules: read the band as a starting hypothesis, then test it: change the two dominant inputs by ten percent and see whether the verdict survives. Verdicts that survive stress are the ones worth acting on.
Related measures answer related questions, and the distinctions matter: Reynolds Risk Score is the quantity, 10-year CHD risk is this tool’s reading of it, and the decision that follows belongs to neither of them separately.
Why Reynolds Risk Score results go wrong — and how to prevent it
CRP is a noisy single draw — use a median of two measurements; and the women’s and men’s coefficient sets are not interchangeable. This calculator gives an estimate based on standard formulas; it is not professional financial, medical, legal or engineering advice. Verify anything you plan to act on with a qualified professional and your own records.
Reusing a Reynolds Risk Score from last season. In Health & Medical the inputs are the thing that drifts; the formula does not.
A final trap is presentation: reporting Reynolds Risk Score to more decimal places than the inputs support. The tool prints what the arithmetic gives; you should quote only what your least precise field justifies.
A quick check for any Reynolds Risk Score figure
- State, in one sentence, which convention each rate, unit or period in the form is using.
- Compare the result with one independent method or published benchmark.
- Confirm the inputs are dated — a Reynolds Risk Score figure should carry the date it was computed.
- Record the date and the inputs alongside the number so future-you knows what was assumed.
- Compare the output against one published benchmark or a colleague’s independent estimate.
- Repeat the ±10 % test on the inputs that matter and see whether the decision — not just the number — still holds.
A routine for decision-grade Reynolds Risk Score
The tool does the arithmetic; the routine below is what makes the arithmetic trustworthy. Five steps, a minute total — and afterwards you will know not just what the number is, but which assumption produced it.
Step 1 — gather before you type. Reynolds Risk Score depends on age, hs-crp (mg/l), total cholesterol (mg/dl), hdl (mg/dl), systolic bp (mmhg), smoker? (0/1) and the remaining fields listed above. Collect them from a source document — a statement, a report, an invoice, a log — rather than from memory, because recalled inputs are the single largest cause of wrong results. Compare the calculation to the rough guess you arrived with, and ask why they differ.
Step 2 — baseline before exploration. Get one defensible 10-year CHD risk on screen before you start nudging numbers. Without a baseline, every variation looks interesting and none of them means anything. Re-running a number costs seconds; retracting a decision costs considerably more.
Step 3 — change one input at a time. Nudge a single field by ten percent, watch the headline and its companions move, then undo it. Two or three fields will dominate — the sensitivity table above already ranks them for this engine. Most surprises in numbers are surprises about inputs, not about formulas.
Step 4 — stress before you commit. A decision that survives a ten-percent squeeze on its two biggest inputs needs no luck to be sound. One that does not survive is a decision about hope, not about arithmetic. Suspiciously tidy answers deserve the same scrutiny as untidy ones.
Step 5 — schedule the next run. In Health & Medical the inputs drift quietly. Put a reminder a quarter out, re-enter the same fields, and read the change rather than the level. The fastest sanity test is to guess the answer first and see how far the calculation disagrees.
From calculation to decision: where Reynolds Risk Score earns its keep
Health & Medical arguments end at arithmetic or they do not end. Reynolds Risk Score is the arithmetic: 0.1% on the example inputs, reproducible by anyone who types the same numbers. When in doubt, prefer the boring input: the interesting one is usually the one you misread.
The audience for this page is students and candidates planning toward a target score. In professional Clinical Calculators practice the pattern is always the same — screen with Reynolds Risk Score, then invest slow analysis only in whatever survives the screen. When two sources disagree, it is almost never the arithmetic that differs.
There is a personal-administration use people overlook: periodic self-checking. Reynolds Risk Score quietly drifts as life changes — rates move, bodies change, costs compound — and re-running it a few times a year catches drift while correction is still cheap. A figure with a date beside it becomes evidence; without one it stays an anecdote.
Quick answers: what searchers ask about Reynolds Risk Score
What is a typical Reynolds Risk Score?
There is no honest universal average for Reynolds Risk Score, but there is a reference point: the defaults on this page produce 0.1% (Reynolds adds hs-CRP and family history to the lipid ratio — the 0.1% here vs a similar PCE number is the inflammation-and-inheritance question made quantitative (women’s coefficient set shown; men’s differs)). Replace the inputs with your own and compare — that comparison is the useful meaning of “typical”.
How do I calculate Reynolds Risk Score by hand?
Ridker 2007 women’s CHD risk function (Cox model with hs-CRP and family history) is the entire method. Work the inputs in that order — Linear predictor with published women’s coefficients — and you will reach 0.1% on the default figures, the same number this tool prints.
Is the Reynolds Risk Score result of 0.1% good or bad?
Good and bad are comparisons, so the honest test is three questions: where does your own Reynolds Risk Score sit against the 0.1% reference above, how far would a plausible input error move it, and what does the alternative option compute to?
How accurate is Reynolds Risk Score for me personally?
The formula encodes averages; body-composition and measurement error typically shifts results by a few percent in either direction. Use ranges and trends, and treat any single 0.1% as approximate.
How do I calculate Reynolds Risk Score manually?
Write down the inputs, then follow the printed steps in order — Ridker 2007 women’s CHD risk function (Cox model with hs-CRP and family history). A spreadsheet replicates it with two or three cells. The manual route is worth doing once to build intuition; after that the calculator saves time and eliminates transcription slips.
Does CRP cause events?
Mendelian and trial evidence supports causality in the vascular-inflammatory pathway, not as a neutral marker.
Why isn’t Reynolds in guidelines?
Guidelines standardized on PCE; Reynolds adds CRP and family history, and is used as a risk enhancer discussion rather than the primary engine.
Does this Reynolds Risk Score tool store my numbers?
No. The entire calculation runs in your browser session; nothing entered above is transmitted or saved, which is the correct behaviour for sensitive Health & Medical figures and the reason you can re-run this page as often as you like.
Key terms on this page
- Inflammation term
- elevated CRP for the Reynolds Risk Score worked case; it sits next to the main result because it carries context the headline leaves out.
- Cholesterol/HDL ratio
- 6.0 for the Reynolds Risk Score worked case; it sits next to the main result because it carries context the headline leaves out.
- Family-history bonus
- absent for the Reynolds Risk Score worked case; it sits next to the main result because it carries context the headline leaves out.
- 10-year CHD risk
- The primary output of this tool: 0.1% for the default inputs, computed exactly from Ridker 2007 women’s CHD risk function (Cox model with hs-CRP and family history).
- Worked example
- The calculation written out in full so that nothing on this page has to be taken on trust.
- Verdict band
- The interpretation attached to a result (“Reynolds adds hs-CRP and family history to the lipid ratio — the 0.1% here vs a similar PCE number is the inflammation-and-inheritance question made quantitative (women’s coefficient set shown; men’s differs)” on these inputs), which turns a bare number into a position on a scale.
Where the Reynolds Risk Score model comes from
There is no black box on this page — the engine evaluates Ridker 2007 women’s CHD risk function (Cox model with hs-CRP and family history). Source of record: Ridker NEJM 2007/2008. Any other implementation of this model should return the same figure for the same inputs. If one does not, the difference is in its assumptions — which this page prints and that one probably does not.
Nothing here replaces a qualified professional, and nothing here is approximate either — the arithmetic is exact, and the honesty is in the inputs you supply. Every intermediate value is printed so that the result can be checked line by line rather than accepted or rejected wholesale.
After the number: what to do with it
Refresh the calculation every term or test cycle — weightings and raw scores both move.
This page was written for students and candidates planning toward a target score, and the promise is that nothing above required trust. Bookmark the tool, re-run it whenever an input moves by more than a few percent, and keep the date with the number.