Difference in testing methods???

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Regular Member

Date Joined Jan 2009
Total Posts : 153
   Posted 5/21/2009 10:12 AM (GMT -7)   
Is there a difference in readings between a home finger prick test and a blood test done at the lab.  For example..would a finger prick test at home of 150 also read a 150 with a blood draw at a lab? 
Diagnosed Friday, February 13, 2009
Colazal 3 tabs 3X daily
Prednisone 40 mg since 3/4/09
Zantac 1 tab 2X daily

Lanie G
Forum Moderator

Date Joined Nov 2006
Total Posts : 5977
   Posted 5/21/2009 10:43 AM (GMT -7)   
Maybe, maybe not.  Once I took my meter with me to an app't when I knew they'd be doing lab work for my fasting as part of my physical exam.  On that day, the lab result came out the same as on my meter but it's the only time I've done it.  I have 4 (yes, 4) meters here, 3 of which use the same test strips and when I use all 3 at the same time, I'll get readings that are anywhere from a few points different to sometimes 20 between the highest and lowest.  I presume the lab would be more accurate of course but it's hard to say how accurate our own personal meters are each time.

forum moderator - diabetes
diabetes controlled so far by low/no carb diet and exercise; no meds

Veteran Member

Date Joined May 2006
Total Posts : 547
   Posted 5/21/2009 11:04 AM (GMT -7)   
A blood draw done by the lab will always be considered more accurate simply because it draws directly from the vein. Our finger tests are a bit less accurate than the veinous blood draw because of exposure to air and interstitial fluid (ISF) considerations (not to mention potential contaminants on the skin). That being said however, manufacturers follow the same standards of accuracy with meters/test strips - a reading has to fall within an accepted deviation. Testing every meter on the market at the same time could result in slightly different results but all should fall within an accurate range.

Sometimes meters can read differently for different reasons, too: batteries run low, strips not calibrated, hands not clean, specimen amount not sufficient, and more. A good way to test your meter's accuracy is to test with it when you get a blood draw and ensure that the results are close (within the 15% or so allowed deviation) of the lab's.
- Phishbowl (Type 1 since Jan'05 - Levemir, NovoRapid)
"What's Not Measured Is Not Managed"

"It is impossible for a man to learn what he thinks he already knows"-Epictetus

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