Glucose^post CFst

Challenge TestingAlso known as: Glucose p fast Bld-sCncAlso known as: Glucose p fast BldC Glucomtr-mCncAlso known as: Glucose p fast BldC Glucomtr-sCncmg/dL

Measures blood glucose level after an 8-12 hour fast using a glucometer.

Normal Range
< 100
mg/dL
Abnormal Levels
Prediabetes (Impaired Fasting Glucose): 100 mg/dL – 125 mg/dL
Diabetes: ≥ 126 mg/dL
Specimen Type
Blood

Why This Biomarker Matters

Fasting glucose is essential for diabetes screening. Elevated levels indicate prediabetes or diabetes risk and warrant lifestyle or medical intervention.

Optimal Ranges

Clinician-defined 4-point reference thresholds (mg/dL)

Default Range

low

high

optimal

borderlineLow

borderlineHigh

Clinical Standards & Thresholds

Authoritative diagnostic cutoffs and screening guidelines for Glucose^post CFst.

FPG Diagnostic Categories

NIDDK2025

The fasting plasma glucose (FPG) test measures blood sugar after at least 8 hours of fasting. It is one of the commonly used tests to classify whether blood sugar levels fall within the normal range, indicate prediabetes, or meet the diagnostic threshold for diabetes.

Normal

< 100mg/dL

Prediabetes (Impaired Fasting Glucose)

100 – 125mg/dL

Diabetes

≥ 126mg/dL

Normal< 100mg/dL

Fasting blood sugar is within the commonly accepted range.

Prediabetes (Impaired Fasting Glucose)100 – 125mg/dL

Fasting blood sugar is above the commonly accepted normal range but below the diabetes threshold. Also called impaired fasting glucose (IFG).

Diabetes≥ 126mg/dL

Meets the commonly used diagnostic threshold for diabetes mellitus. Confirmation on a separate day is generally recommended.

Source: NIDDK

Prediabetes Definitions

NIDDK2025

Prediabetes means blood sugar levels are higher than normal but not high enough to be classified as diabetes. It can be identified by any one of three tests: HbA1c of 5.7-6.4%, fasting plasma glucose of 100-125 mg/dL, or a 2-hour OGTT result of 140-199 mg/dL.

Prediabetes (by HbA1c)5.7 – 6.4%

HbA1c in the prediabetes range. Any one prediabetes criterion is sufficient for classification.

Prediabetes (by FPG)100 – 125mg/dL

Fasting plasma glucose in the impaired fasting glucose range. Any one prediabetes criterion is sufficient.

Prediabetes (by OGTT)140 – 199mg/dL

Oral glucose tolerance test result in the impaired glucose tolerance range. Any one prediabetes criterion is sufficient.

Source: NIDDK

Overview

This test measures blood glucose after a fasting period, typically 8-12 hours without food or drink. Fasting glucose is a fundamental screening tool for metabolic disorders including diabetes and prediabetes. Normal fasting glucose ranges from 70-100 mg/dL; levels 100-125 mg/dL suggest prediabetes, and values above 126 mg/dL indicate diabetes. Fasting glucose is less affected by recent meals than non-fasting measurements, providing a stable baseline for assessing long-term glucose control and metabolic health.

Related Health Conditions

Conditions where Glucose^post CFst is commonly tested

Diabetes mellitus type II

Prediabetes

Technical Information (LOINC Codes)

Standardized laboratory codes for this biomarker

1558-6Primary
Fasting glucose [Mass/volume] in Serum or Plasma
mg/dL
14770-2
Fasting glucose [Moles/volume] in Capillary blood by Glucometer
mmol/L
16913-6
Fasting glucose [Presence] in Urine
6764-5
Fasting glucose [Presence] in Urine by Test strip
41604-0
Fasting glucose [Mass/volume] in Capillary blood by Glucometer
mg/dL
63382-6
Fasting glucose [Mass/volume] in Urine
mg/dL
1556-0
Fasting glucose [Mass/volume] in Capillary blood
mg/dL
76629-5
Fasting glucose [Moles/volume] in Blood
mmol/L
1557-8
Fasting glucose [Mass/volume] in Venous blood
mg/dL
77145-1
Fasting glucose [Moles/volume] in Serum, Plasma or Blood
mmol/L
14771-0
Fasting glucose [Moles/volume] in Serum or Plasma
mmol/L
53114-5
Fasting glucose [Moles/volume] in Urine
mmol/L
101476-0
Fasting glucose [Moles/volume] in Venous blood
mmol/L

Available Lab Tests

Order tests that measure this biomarker

Glucose Tolerance Test 6 Specimens

$38.50