Welcome to the NGSP Web Site

The purpose of the NGSP is to standardize Hemoglobin A1c test results to those of the Diabetes Control and Complications Trial (DCCT) and United Kingdom Prospective Diabetes Study (UKPDS) which established the direct relationships between HbA1c levels and outcome risks in patients with diabetes.

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The Relationship Between HbA1c and Estimated Average Glucose (eAG)

More about the DCCT | More about the UKPDS

Convert between NGSP, IFCC and eAG

We have added a tool for converting between NGSP(%), IFCC (mmol/mol) and eAG (mg/dL) units. Click here...

Interferences with HbA1c Measurements

Factors that can result in falsely elevated or lowered HbA1c results include hemoglobin variants and conditions which affect red cell lifespan. Read more...

CAP 2024c Summary Report

The summary report for the CAP 2024 GH5c proficiency survey is now available. Download...

NGSP Certification Prices to Increase

NGSP laboratory and manufacturer certification costs will increase in 2025. Read more...

HbA1c to be CLIA-regulated in 2025

The new CMS rule will impact HbA1c proficiency testing. Read more...