The Anonymous Widower

My INR For January 2014

As January is now finished, I can show a graph of my daily INR tests for January 2014.

My INR For January 2014

My INR For January 2014

The average INR for the month was 2.6 with a standard deviation of 0.2.  This is well within the range of 2 to 3 and just above the target of 2.5.

I’m using a simple algorithm of 4 mg. normally, with 3 mg. if the INR is above or equal to 2.8 and 5 mg, if it is below or equal to 2.2.

It would be interesting to see if the results with the switch limits set to 2.1 and 2.9, or if a little bit of integral control were to be introduced. As with all control systems, getting everything stable always needs a bit of fine tuning.

January 31, 2014 - Posted by | Health | ,


  1. hello fellow traveller. Your blog intro bears a remarkable similarity to my own journey.

    As well as lifes events I too am studying my INR.

    Best Wishes

    Comment by Chris | January 31, 2015 | Reply

  2. I know it costs me a small amount each day, but I don’t like the way INR goes up and down with the weather. If you test every few weeks, there’s a strong chance the value will be very low or very high and the quacks will give you the wrong dose.

    As with many things, the more the better.

    As a control engineer by training, I reckon I’m well qualified.

    Give me a shout if you ever get to London.

    Comment by AnonW | January 31, 2015 | Reply

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