What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveBoth

LOINC Code 81637-1: Glucose meter to reference method correlation Calc (S/P/Bld) [Ratio]

Name: LOINC Code 81637-1: Glucose meter to reference method correlation Calc (S/P/Bld) [Ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:05.775Z

81637-1 is a LOINC code used to identify Glucose meter to reference method correlation Calc (S/P/Bld) [Ratio] in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Glucose meter to reference method correlation. It is commonly used with the system or sample type Ser/Plas/Bld.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

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 Glucose meter to reference method correlation. It is commonly used with the system or sample type Ser/Plas/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

Glucose meter to reference method correlation [Ratio] in Serum, Plasma or Blood by calculation

Glucose meter to reference method correlation

The glucose correlation is a charted value used to monitor the accuracy of glucose meter results as compared to reference method results for quality assurance purposes. According to draft guidance from the Food and Drug Administration in 2014, for point-of-care blood glucose meter devices used by healthcare providers, 99% of all values should be within 10% of the reference method for glucose concentrations > 70 mg/dL and within 7 mg/dL for glucose concentrations < 70 mg/dL.[http//www.fda.gov/downloads/medicaldevices/deviceregulationandguidance/guidancedocuments/ucm380325.pdf] For self-monitoring blood glucose meters used by patients, 95% of all results should be within 15% of the reference method result and 99% of all results should be within 20% of the reference method result across the entire claimed measuring range of the instrument. [http://www.fda.gov/downloads/medicaldevices/deviceregulationandguidance/guidancedocuments/ucm380327.pdf]

Blood; Calc; Calculation; Chemistry; Glu; Gluc; Glucose correlation; Glucoseur; Meth; Method of; Pl; PlasBld; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; Ratios; Rto; SerP; SerPl; SerPlas; SerPlBld; Serum; Serum or plasma; Serum, plasma or whole blood; SR; 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.

Common synonyms

Glucose meter to reference method correlation Calc (S/P/Bld) [Ratio]Glucose meter to reference method correlation [Ratio] in Serum, Plasma or Blood by calculationGlucose correlation SerPlBld Calc-RtoGlucose meter to reference method correlationCHEMGlucose meter to reference method correlation, BloodRatio

Frequently asked questions

Code details

Code81637-1

SystemLOINC

Display nameGlucose meter to reference method correlation Calc (S/P/Bld) [Ratio]

DescriptionGlucose meter to reference method correlation

Short nameGlucose correlation SerPlBld Calc-Rto

ComponentGlucose meter to reference method correlation

PropertyRatio

TimingPt

System (specimen)Ser/Plas/Bld

ScaleQn

MethodCalculated

ClassCHEM

Example units%

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.56

Last changed2.56

Consumer names

Glucose meter to reference method correlation, Blood

Part names

Glucose meter to reference method correlationRatioPtSer/Plas/BldQnCalculatedPoint in time (spot)Serum, Plasma or Blood

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.