Quest test

Glucose Plasma Test

Quick Overview

The glucose plasma test determines if your blood glucose level is within healthy ranges.

Test #484


Availability: In stock

Also Known As Blood Sugar, Fasting Blood Sugar, FBS, FPG, Random Blood Glucose.
Preparation Fasting for 10-12 hours required.
Test Results 1-2 days. May take longer based on weather, holiday or lab delays.

Why It Is Used

The glucose plasma test is used mainly for type 1, type 2, and gestational diabetes testing and diagnosing. The test is also used to identify diabetes complications and track diabetes treatment outcomes.

How It Works

Fasting for an extended period of time causes the release of glucagon into the blood.  Glucagon is a peptide hormone produced by the pancreas. By stimulating the liver to convert its stored glycogen into glucose, the glucagon hormone is used to boost blood glucose. When glucose enters the bloodstream, it tells the body to pump insulin into the blood to assist in transporting the glucose from the blood into cells for storage as energy. Glucagon is used by the body along with insulin to keep a good blood glucose level. However, in an individual with diabetes, he or she may not be able to generate enough insulin to handle the glucose-stimulated by the glucagon, resulting in high blood glucose concentrations.

Test findings are interpreted by examining blood sugar concentrations.  Glucose is measured in mg / dL per deciliter and may fall into one of four categories with distinct medical consequences.  Based on what test is being used, normal findings differ.  The findings below are representative figures based on the fasting test for glucose plasma.

  • Below 70 mg/dL: blood glucose levels lower than 70 mg/dL after the fasting test indicate an abnormally low level of blood sugar and may be cause for a diagnosis hypoglycemia.
  • 70 mg/dL to 99 mg/dL: blood glucose levels that fall within this range after fasting for 10-12 hours are considered to be normal and healthy.
  • 100 mg/dL to126 mg/dL: after fasting blood glucose levels in this range indicate a possible diagnosis of pre-diabetes and a heightened risk of developing diabetes.
  • Above 126 mg/dL:  If a blood glucose level is above 126 on the glucose plasma test, then a diagnosis of diabetes will likely be made.

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