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Question: From Onsted, Michigan, USA: What is the typical standard deviation for the A1c test? Answer: If you are using standard deviation as a measure of the reliability of a hemoglobin A1c test, the best figures are those from the American College of Pathology EXCEL proficiency testing program. In a recent report on 109 laboratories all using the DCA 2000 program, the standard deviation on a sample mean of 5.93% was 0.3 which gives a variance (S.D./mean x 100) of 5% and 95% confidence limits of about twice this. The second most commonly used method however had a variance of more than 10%, and at the other end of the scale, in an individual laboratory where a single person does all the tests and maintains the instruments the variance may be less than 3.0%. DOB [Editor's comment: See also HbA1c Measurement and The National Glycohemoglobin Standardization Program. JSH] DTQ-20010820230700 Original posting 12 Feb 2002 Posted to A1c, Glycohemoglobin, HgbA1c

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			Jump to a new section --[ Getting Around ]-- Home Page What's New Privacy Policy Search --[ People ]-- Family Support Network Adults with Diabetes Care Photos Chat Rooms Conferences Kids with Diabetes Parents Parent Humor Scholarships and Financial Aid Grandparents Humorous Tidbits Jobs Mailing Lists CWD Forums Poetry and Art Videos Polls Quilt for Life Surveys Blogs --[ Clinic ]-- Ask the Diabetes Team Alternate Site Testing Alternative Treatments Care Suggestions CWD Español Diabetes Basics Diabetes at School 504 Plans Diabetes Camps Diabetes Dictionary Insulin Pumps Nutrition Podcasts Presentations Products Product Marketplace Sports Studies Warning Signs --[ Sources ]-- News and Information Diabetes Advocacy Links to Other Web Sites Press Releases Regional Information Services Support Groups --[ Feedback ]-- About CWD Advertise Awards Contribute Your Experiences Disclaimer Letters to the Editor Logos and Linking Share our Brochures

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