from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A creatine anhydride, C4H7N3O, formed by the metabolism of creatine, that is found in muscle tissue and blood and normally excreted in the urine as a metabolic waste.

from The Century Dictionary.

  • noun An alkaline crystallizable substance (C4H7N3O) obtained by the action of acids on creatine, and found in urine and muscle extract. Also spelled kreatinine, kreatinin.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun biochemistry A heterocyclic amine 2-amino-1-methyl-5H-imidazol-4-one formed by the metabolism of creatine


from The American Heritage® Dictionary of the English Language, 4th Edition

[creatin(e) + –ine.]


  • Now some other things that are very, very encouraging and show very good, when he initially came in the hospital for his kidney function test, he had what we call a creatinine, which is a function of the kidneys.

    CNN Transcript Jul 16, 2001

  • You can learn as much – or more – from one glance at a private space as you can from hours of exposure to a public face. hamilton beach health smart juicer urinary protein creatinine ratio

    Matthew Yglesias » The Final Frontier

  • The "kidney number" is a measure of kidney function and is based on the amount of a substance called creatinine in the blood.

    RedOrbit News - Technology

  • The creatinine is a sign that your kidney isn’t filtering the way it should, and your blood pressure is putting stress on the filtering mechanism, so you’re putting out blood and protein in your urine.

    After the Diagnosis

  • In sum, the more Creatine, the more "creatinine" and thus greater negative effect on the body.


  • When ingested, most of Creatine rapidly converts to the by-product "creatinine," the toxic substance responsible for causing the unwanted side effects.


  • It also facilitates patient hand-off and helps pharmacists and other infection preventionists provide appropriate therapies for key indicators such as creatinine/INR abnormalities, IV/PO use and duplicate medication therapy.

    Latest News from SYS-CON MEDIA

  • Renal function, including BUN and creatinine should be monitored.

    Monamine Oxidase Inhibitors

  • The effects of age on creatinine clearance in men: a cross-sectional and longitudinal study.


  • Adzick NS, Harrison MR, Flake AW, Laberge JM, Villa RL: Development of a fetal renal function test using endogenous creatinine clearance.

    Obstructive Uropathy, Fetal Intervention for Obstructive Uropathy


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  • An alkaline crystallizable substance C4H7N3O, a normal constituent of urine and of the juice of muscular flesh. (OED online)

    I only know this word because someone's always asking for it on NBC's "ER": "What's his creatinine?!"

    Like that.

    February 5, 2007