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Blood test
Blood test


Glucose test

Alternative Names:
FBS; Blood sugar levels; Fasting blood sugar

What the risks are:
  • Excessive bleeding
  • Fainting or feeling lightheaded
  • Hematoma (blood accumulating under the skin)
  • Infection (a slight risk any time the skin is broken)
  • Multiple punctures to locate veins


Special considerations:

Many forms of severe stress (for example, trauma, stroke, heart attack, and surgery) can temporarily increase glucose levels.

Drugs that can increase glucose measurements include the following:

  • Tricyclic antidepressants
  • Corticosteroids
  • Diazoxide
  • Intravenous dextrose
  • Diuretics
  • Epinephrine
  • Estrogens
  • Glucagon
  • Isoniazid
  • Lithium
  • Phenothiazines
  • Phenytoin
  • Salicylates (acute toxicity -- see aspirin overdose)
  • Triamterene

Drugs that can decrease glucose measurements include the following:

  • Oral acetaminophen
  • Alcohol
  • Anabolic steroids
  • Clofibrate
  • Disopyramide
  • Gemfibrozil
  • Monoamine oxidase inhibitors (MAOIs)
  • Pentamidine
  • Sulfonylurea medications (such as glipizide, glyburide, and glimepiride)

Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.




Review Date: 2/2/2005
Reviewed By: A.D.A.M. editorial. Previously reviewed by Aniket R. Sidhaye, M.D., Division of Endocrinology and Metabolism, Johns Hopkins University School of Medicine, Baltimore, MD. Review provided by VeriMed Healthcare Network.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 2004 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

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