I just read Marty's thread about the Vermont Medical school not being able to ?get coordination or linearity with the central lab?.
That sounds like what is happening to me! This last February I realized I had a problem with my protime machine. The machine was saying I was in range, but my body was telling me I wasn?t. I had the red spots, bruising, all those signs you learn to recognize as a high INR. That?s when I began comparisons with the lab. It continues to read from .3 to as much as 1.5 below the lab readings. When I first got the machine in October of 2000 I tested against the same lab I?m testing against now and got these comparisons.... 10-22-00 Protime 2.12 Lab 1.7 I was freaked out about that at the time, but the Protime people told me anything under .5 was acceptable and the difference there was only .42.... soooooooo about three months later I did another comparison 1-19-00 Protime 2.31 Lab 2.54 I was delighted and had the utmost confidence in my machine...... Until Feb. of this year!
The Protime people want me to do a correlation with the lab to establish a bias. Then I would change my range to fit the reading my machine is giving me. I?m having a bit of a hard time here, because my husband seems to agree with the protime people that that should work just fine. Well my problem is... if the machine isn?t consistently reading the same amount different from the lab... How can I rely on a bias?! This is my readings since I started comparing the machine to the lab...
2-14-03 Protime 4.1 Lab 5.1 = off by -1.0
2-20-03 Protime 2.8 Lab 3.6 = off by -.80
3-1-03 Protime 2.6 Lab 2.93 = off by -.33
3-11-03 Protime 3.7 Lab 4.4 = off by -.70
3-17-03 Protime 4.4 Lab 5.91 = off by -1.51
3-25-03 Protime 2.9 the next day I tested on the machine
3-26-03 Lab 3.35 = off by -.45
4-2-03 Protime 2.5 Lab 3.6 = off by -1.1
4-11-03 Protime 3.0 Lab 3.98 = off by -.98
I realize there are many things that can effect your readings. I do the tests exactly right...always have my blood in the cup on time, never slice my finger before it says to, finger is always clean and dry, the cuvette is always out of the fridg for at least 30 mins... all those things. And I always make sure they fill the tube all the way up at the hospital, make sure they don't shake it... they do the tests right away... it's not sitting around or being transported anywhere. I also realize that a difference in the two testing devices is to be expected... but wouldn't you think they would be somewhat 'consistently' different? Ho humm... its exhausting just thinking about it. I just want my reliable machine back!!
I know most of you are happy protime users, but I trust your opinions none the less. I would like to know if you guys think that if I did twenty comparisons with the lab, that they (protime people) could come up with a ?bias? that I could adjust my INR range to? I?m having a hard time thinking it could be something I could rely on. I don?t want to give Protime a bad name ... that?s why I deleted the other thread... but I want to know what you guys think about this.
And Michele I?ve got a question for you.... I was told from the beginning that for $350.00 I could get my machine fixed and upgraded at the same time. My husband talked to Sue Barrett.. he seems to think that the $350.00 will only get you the upgrade, but will not necessarily guarantee the machine is fixed?! When I talked to the lab tech, he told me it would guarantee a fix. Ms. Barrett has apparently been out of her office all week... I?m hoping you or someone can answer this question for me. I?m much more concerned about the ?fix? than the upgrade!
That sounds like what is happening to me! This last February I realized I had a problem with my protime machine. The machine was saying I was in range, but my body was telling me I wasn?t. I had the red spots, bruising, all those signs you learn to recognize as a high INR. That?s when I began comparisons with the lab. It continues to read from .3 to as much as 1.5 below the lab readings. When I first got the machine in October of 2000 I tested against the same lab I?m testing against now and got these comparisons.... 10-22-00 Protime 2.12 Lab 1.7 I was freaked out about that at the time, but the Protime people told me anything under .5 was acceptable and the difference there was only .42.... soooooooo about three months later I did another comparison 1-19-00 Protime 2.31 Lab 2.54 I was delighted and had the utmost confidence in my machine...... Until Feb. of this year!
The Protime people want me to do a correlation with the lab to establish a bias. Then I would change my range to fit the reading my machine is giving me. I?m having a bit of a hard time here, because my husband seems to agree with the protime people that that should work just fine. Well my problem is... if the machine isn?t consistently reading the same amount different from the lab... How can I rely on a bias?! This is my readings since I started comparing the machine to the lab...
2-14-03 Protime 4.1 Lab 5.1 = off by -1.0
2-20-03 Protime 2.8 Lab 3.6 = off by -.80
3-1-03 Protime 2.6 Lab 2.93 = off by -.33
3-11-03 Protime 3.7 Lab 4.4 = off by -.70
3-17-03 Protime 4.4 Lab 5.91 = off by -1.51
3-25-03 Protime 2.9 the next day I tested on the machine
3-26-03 Lab 3.35 = off by -.45
4-2-03 Protime 2.5 Lab 3.6 = off by -1.1
4-11-03 Protime 3.0 Lab 3.98 = off by -.98
I realize there are many things that can effect your readings. I do the tests exactly right...always have my blood in the cup on time, never slice my finger before it says to, finger is always clean and dry, the cuvette is always out of the fridg for at least 30 mins... all those things. And I always make sure they fill the tube all the way up at the hospital, make sure they don't shake it... they do the tests right away... it's not sitting around or being transported anywhere. I also realize that a difference in the two testing devices is to be expected... but wouldn't you think they would be somewhat 'consistently' different? Ho humm... its exhausting just thinking about it. I just want my reliable machine back!!
I know most of you are happy protime users, but I trust your opinions none the less. I would like to know if you guys think that if I did twenty comparisons with the lab, that they (protime people) could come up with a ?bias? that I could adjust my INR range to? I?m having a hard time thinking it could be something I could rely on. I don?t want to give Protime a bad name ... that?s why I deleted the other thread... but I want to know what you guys think about this.
And Michele I?ve got a question for you.... I was told from the beginning that for $350.00 I could get my machine fixed and upgraded at the same time. My husband talked to Sue Barrett.. he seems to think that the $350.00 will only get you the upgrade, but will not necessarily guarantee the machine is fixed?! When I talked to the lab tech, he told me it would guarantee a fix. Ms. Barrett has apparently been out of her office all week... I?m hoping you or someone can answer this question for me. I?m much more concerned about the ?fix? than the upgrade!