Has anyone compared home testing with lab test for accuracy?

[pellicle]

Bocco

Please read this PDF especially the first table. The differences you see may well be explained in there.

http://www.cobas.com/content/dam/cob...-precision.pdf

To me your reading is good and I would stick with whatever your current dose is without variation for a week. Document and test again. While you are at it have a read of my post here:
http://www.valvereplacement.org/for...ion/858187-warfarin-blues?p=858188#post858188

And this blog post of mine here

http://cjeastwd.blogspot.com/2014/05/inr-management-goldilocks-dose.html

 

[R1Phrankey]

I have a Coagucheck XS and I have compared this with another Coagucheck XS and lab vein draws when I was in hospital. Difference was 0.1.

 

[Protimenow]

My current meter of choice is the Coag-Sense, I don't expect the INR to match those of the lab. HOWEVER, recently, the Prothrombin times for lab and meter were within tenths of a second of each other -- it's the adjustment that is made for the specific reagent that is being used that can provide a different INR. My INR, reported by the meter, is almost consistently below that reported by the lab.

I checked with the manufacturer of the meter and strips and was assured that the differences were still WITHIN the approved margin of error for INR testing.

For myself, as long as my meter gives me a 2.1 or higher, I don't worry. I'd much rather have an INR at or near the top of the range than have one below and risk another TIA.

As far as reliability is concerned - if I had a meter that was CONSISTENTLY different from the lab - either many points higher or many points lower, as long as I KNEW that the difference was always reliably the same, I'd just make the adjustment to calculate the actual lab value. (For example, an extreme example, assume that my meter was CONSISTENTLY 3.0 higher than the lab. if my meter reported a 5.5, and I could reliably conclude that the lab's value would be 2.5, I wouldn't be concerned about my INR. An earlier post from someone else even had a formula for calculating what the lab's results would be, based on a meter's values.)

Personally, I'm comfortable with my Coag-Sense reporting a bit LOWER than the lab - consistently - so that I know that if my INR reported by the meter stays above 2.0, or so, my INR is okay.