C5DC Glutaryl (glutarylcarnitine)

The C5DC Glutaryl test measures glutarylcarnitine, an acylcarnitine formed when the body links glutaryl-CoA to carnitine during the breakdown of certain amino acids. It reflects how your body processes lysine and tryptophan and how well a specific metabolic pathway is working.

This test is usually performed on blood using tandem mass spectrometry and is often part of an acylcarnitine profile. It helps doctors screen for and evaluate metabolic conditions that can affect energy production, especially in infants and children, and can also be used to monitor known disorders over time.

Glutarylcarnitine can be elevated in glutaric acidemia type I, a rare inherited condition in which an enzyme needed for processing specific amino acids does not work properly. Finding changes early allows prompt dietary management and other treatments that can lower the risk of serious illness and neurological injury, particularly around times of infection or stress.

Your clinician may order this test after a newborn screen, when there are symptoms suggestive of a metabolic disorder, or to follow an established diagnosis. Results are interpreted together with other acylcarnitines, urine organic acids, and genetic or enzyme studies to clarify the cause and guide care.

Your result is interpreted using age-appropriate reference intervals and your clinical situation. A higher result can suggest a metabolic disorder such as glutaric acidemia type I, but temporary changes can also occur with illness, nutritional status, or certain therapies. A normal result is generally reassuring, yet your care team may still pursue additional tests if symptoms or other findings raise concern.

If your level is outside the expected range, your clinician may order follow-up testing such as urine organic acids, specific biomarkers, and genetic or enzyme analysis. Treatment decisions consider your symptoms, exam findings, and the overall pattern of laboratory results. If you have a known condition, trends over time help assess how well your current management plan is working.