URINE TEST

WHAT ARE ORGANIC ACIDS?

Organic acids are chemical compounds excreted in the urine of mammals that are products of metabolism. Metabolism is the sum of chemical reactions in living beings by which the body builds new molecules and breaks down molecules to eliminate waste products and produce energy. Organic acids are organic compounds that are acidic. Organic acids are substances in which carbon and hydrogen are always present but which may also contain the elements of oxygen, nitrogen, sulfur, and phosphorus as well.

The names of most organic acids contain the suffix –ic, followed by the word “acid” such as lactic acid. Every organic acid has one or more conjugate bases named with the suffix –ate. Thus, the conjugate base of lactic acid is lactate. Many times, the name of the organic acid and its conjugate base(s) are used interchangeably when discussing physiology and biochemistry, such as lactate or lactic acid. The most common chemical groups associated with organic acids are carboxylic acids which are present in the conjugate base form at neutral pH, 7.0, the pH of the inside of most living cells. Organic acids with one carboxylic acid have one conjugate base while some organic acids may have two or three carboxylic acids and two or three conjugate bases.

HOW ARE ORGANIC ACIDS MEASURED FOR MEDICAL REASONS?

Almost all organic acids used for human testing are measured by a combination of gas or liquid chromatography linked with mass spectrometry. Organic acids are most commonly analyzed in urine because they are not extensively reabsorbed in the kidney tubules after glomerular filtration.  Thus, organic acids in urine are often present at 100 times their concentration in the blood serum and thus are more readily detected in urine.  This is why organic acids are rarely tested in blood or serum. The number of organic acids found in urine is enormous.  Over 1,000 different organic acids have been detected in urine since this kind of testing started.

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