I don't think Dakota is still in business - or in the business of INR meter or supplies. I dealt with them a few years ago, and it seemed that they'd abandoned or left the business.
I've had an issue with the CoagSense machine - the results are fairly consistent -- and I'll be devoting three fingers to each of my three CoagSense meters (a PT2 and two PT1s), to see if they all agree - or if the results are close to each other. Last Friday, I had a blood draw from a lab that was wildly inaccurate last March, and I had an experience with the lab's results being much higher then the meter results.
At that time, I tested with blood draws from other labs - and their results were much closer to the meter than they were to that other lab.
I'm hoping to get some CoaguChek XS strips so I can also test on that meter. Right now, I can't afford any, and the expired strips that I received from someone on this forum aren't usable.
I am still inclined to trust my meter before trusting this lab.
If I were you, I'd wait before getting an XS -- just to be sure that it's not the lab that's messing up the results.
Thanks for the tips. My current issue is that my meter (for the first 4 lab tests) can be correlated with the lab to about 96%. The regression equation puts the meter with + or minus 0.1 of the lab. The issue to me is that you had mentioned in another post that your meter tended to read about 0.2 below your lab readings. Mine tends to read 0.2 to 0.4 above - before the regression equation correction. I am wondering if there is a systematic error in either the Coag-Sense device or the Lab Device. The correlation is amazingly good when corrected and good even when not corrected. 0.4 twice and 0.2 twice. Unfortunately, this includes one value at the high end of my range, 2 in the middle and 1 at the low end. I will keep testing between lab draws always at lab draws. Gathering information is interesting but I am puzzled.
Also, I cannot get information on where the TEVA brand of generic coumadin is made. After listening to "Bottle of Lies", my mistrust of Indian and Chinese generics has gone up.
Because I was prediabetic, I track everything I eat on a scale. Spreadsheets have wonderful capabilities and I collect data on all the K1 I consume. (the K2 as well but with Agriculture's definition of organic being 100 or more days of grass fed - that data is capable of being way off).
By the way, the spreadsheet worked. I followed Dr. Atkins and Dr. Richard Bernstein's Diabetes book diets. My A1c is down to 5.1 which is well within the normal range. My endocronologist says whatever you are doing following their diets, keep doing it and you will probably stay not a prediebetic and never a diabetic. So I will keep tracking both carbohydrates, K1 and K2 with my spreadsheets. The INR spreadsheet is still developing as I have had to develop data to convince my doctors. Happily, Dr. Stacy Johnson and others have published research on correlating INR meters with Lab machines. I have modeled my regression math on theirs. As Dr. Johnson put it, it is really 1st semester statistics. It helps to walk in with research papers by M.D.s and PharmD's that look similar to your spreadsheets.
With all that spreadsheet work and consuming 300 units of K1 per day, my INR still cycles nicely. (I take K1 pills to round the food K1 that I consume to 300 +-12.5 a day. If I go over (not often) I just say "oops" and take no K1 pills.
Unhappily, my INR is usually NOT always above 2 but has usually been below 3.5. I recently hit 2 again and had to increase my dose by 0.5. Since the highs in my cycles usually are around 3.3 I don't want to swap hitting the bottom for hitting the top. I keep reminding myself not to overthink it, but it is difficult.
Is there a generic manufacturer who has their coumadin tested for bioavailability, bioequivalence, etc? And publishes the results to show that their generic is truly equivalent to Warfarin? I wonder sometimes whether variations in manufacturing at a sloppy generics factory could be causing the variations. My last two months data when charted look more like an irregular roller coaster then like a regular sine wave. I am looking for a quality generic made in USA, Canada or Australia where the FDA or its local equivalent actually drives quality. Its one more potential reducer of variability. I know that variability will never go to zero.
Walk in His Peace,
Scribe With a Lancet