INR Mate resources

Plain-English help for keeping warfarin records organised.

A small static resource library for people who want clearer INR records, calmer appointments and a better alternative to scattered notes.

Founder story

Why I built INR Mate

I’m Alistair Hutchinson, a UK Nurse Practitioner, and I take warfarin after an aortic valve replacement. INR Mate grew out of lived experience as much as technical curiosity: INR checks, dose records, reminders, appointment notes and the daily reality of managing warfarin long term.

My own route to warfarin started unexpectedly. A scan for suspected pulmonary embolism did not find a clot, but it did reveal a large aortic root aneurysm. Eight weeks later I had open-heart surgery at James Cook University Hospital, including a mechanical aortic valve replacement. That meant lifelong warfarin.

Early after surgery, my INR rose dangerously high and I was re-admitted with blood around my heart. Thankfully I recovered, but the experience made INR tracking feel very real, very quickly. The yellow book worked, but it never felt like the long-term tool I wanted to carry everywhere.

I looked for an iPhone app that felt native, clear and built specifically for warfarin users, but nothing quite matched what I wanted. Eventually, I decided to build it myself: a private, practical tracker for records, trends, reminders and appointment exports, without giving dosing advice.

Read the full story behind INR Mate →

Appointment checklist

What to take to an anticoagulation appointment

Recent INR results, including dates.
Your current warfarin schedule and any one-off changes.
Missed or delayed doses, if any.
Medication changes, antibiotics, illness, diet changes or alcohol changes that may be relevant.
Questions you want to ask before the appointment fog rolls in.

INR Mate helps by keeping readings, dose records, notes and exports in one place.

Safety first

Why INR Mate does not give dosing advice

Warfarin dosing decisions depend on clinical context, local protocols, medication changes, bleeding risk, clotting risk and advice from your anticoagulation team. That is why INR Mate stays firmly in the record-keeping lane.

The app can help you log, review and export your information. It does not tell you what dose to take, diagnose problems or recommend treatment.

Diary basics

How to keep a useful INR diary

A useful INR diary is not complicated. Record the date, INR result, dose information and any useful context. Short notes can be enough: “started antibiotics”, “missed dose”, “clinic changed dose”, or “self-test result”.

The best record is the one you can keep using on ordinary days, not the perfect system abandoned by Thursday.

Try the app

Keep your records in one place.

INR Mate is available for iPhone, iPad and Apple Watch. It is for tracking and record keeping only.