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 2026a Summary Report

The summary report for the CAP 2026 GH5a proficiency survey is now available. Download...

Manufacturer Forum at the ADLM

The NGSP/IFCC Manufacturer Forum will take place on July 27, 2026 in Anaheim, CA. Read more...

HbA1c is now a CLIA-regulated Analyte

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