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RE: [IP] Meter Question/still pro Ultra ;)

Jim, excellent post! I never understood the meter accuracy-comparison
issue...still don't . One time, I pricked all my fingers and laid samples on
7 meters, side by side... the numbers were up to 150 point apart - even
within the same brand meter! The meter Companies said I can't test meters
like that...   (that is hard for this Mom to accept I guess)

I will tell you that when my daughter went into DKA from a stomach virus, I
used the ULTRA along side her blood draws and they were almost to the POINT!
100% accurate more than twice. I think one time the numbers were 4 off...
THAT I can live with... being 150 off isn't even close enough to decide how
much insulin to give or NOT give...

Connie Miller
Daughter diagnosed 4/99

-----Original Message-----
From: email @ redacted
[mailto:email @ redacted]On Behalf Of James Handsfield
Sent: Monday, March 04, 2002 7:33 PM
To: email @ redacted
Subject: Re: [IP] Meter Question

Jennifer Harkleroad <email @ redacted> wrote:

> I beg to differ on the idea that all meters are precisely accurate.

I'll put on my professional hat for this one.

Federal regulations require all waived laboratory tests, which includes home
glucose test meters, to achieve certain standards before they may be
marketed.  There are two basic standards:  1) the device must be simple
enough so that the instructions may be read, understood, and followed
without assistance by someone with a seventh grade education; and 2) the
device must have results that are within 5% of a standard equivalent
laboratory test (moderate complexity) 50% of the time.  That precision level
is approximated as +/- 20% of the laboratory tests (not another meter).

If you compare meters against each other, the ranges of precision have to be
compounded (IOW, the precision ranges will be quite a bit greater than +/-
20%) to get the appropriate range because they are not independent events.
It is inappropriate for that reason to compare the results of home test
meters against each other.  The only reliable test is to do your own test at
the same time you are having blood drawn for a laboratory glucose test.

These standards were/are developed by the Standards Branch of the Division
of Laboratory Systems of CDC where I work.  I have provided statistical
support for this branch on several occasions.

If you believe your meter is not sufficiently accurate or precise, contact
the manufacturer.  They generally have very liberal replacement policies.
But giving comparisons against other meter results won't suffice.

Jim Handsfield
email @ redacted

The opinions expressed are mine and do not necessarily represent those of my
wife who runs our house and makes more important decisions than I do.
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