LOINC Code 17855-8: HbA1c Calc (Bld) [Mass fraction]

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Hemoglobin A1c/Hemoglobin.total. It is commonly used with the system or sample type Bld.

When is it used?

• Used in lab systems, EHRs, and clinical data exchange.
• May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
• Status: ACTIVE
• Order vs observation: Both
• Method: Calculated

What it does not mean

• The code identifies the observation or test, not the actual result.

Key facts

• Hemoglobin A1c/Hemoglobin.total in Blood by calculation
• Hemoglobin A1c/Hemoglobin.total
• Changing from the property from Mass fraction to substance fraction has not effect on the meaning when the molecular weight of the numerator and the denominator are the same (for practical purposes). These terms had had a property of MFR in the past and we changed to SFR because we thought the LOINC community preferred SFR for HbA1c. But we mis understood the preference is to use the MFR variant- so we have changed back.
• Blood; Calc; Calculation; Chemistry; Endocrine; Endocrinology; GHb; Glycated hemoglobin; Glycohaemogolobin; Glycohemogolobin; Glycosylated hemoglobin; HA1c; Haemoglobin; Hb; HbA1c; Hgb; Hgb A1c; Mass fraction; Percent; Point in time; QNT; Quan; Quant; Quantitative; Random; Tot; Totl; WB; Whole blood

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Related SNOMED CT concepts

Related observations and tests

Common synonyms

Frequently asked questions