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Diabetes & Blood Sugar Testing

Learn about glucose, hemoglobin A1c, insulin, C-peptide, and related laboratory tests used in screening, diagnosis support, and monitoring.

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How to use this hub

1Start with contextUse the topic overview to understand which tests answer which questions.
2Check preparationFasting, timing, medications, supplements, and specimen type can matter for selected tests.
3Use your reportReference ranges, units, and methods can differ between laboratories.
4Compare carefullyMatch exact test components and specimen requirements before comparing self-pay prices.
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Compare Diabetes test prices

Open the dedicated CTX Stat comparison tool to search mapped self-pay prices across major direct-to-consumer laboratory providers.

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Common questions

Diabetes FAQs

What is the difference between glucose and A1c?

Glucose measures blood sugar at a point in time, while hemoglobin A1c reflects average glucose exposure over roughly the prior two to three months.

Do glucose tests require fasting?

Some do and some do not. A fasting glucose specifically requires fasting, while random glucose and A1c generally do not.

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