Test ID: C4U
C4 Acylcarnitine, Quantitative, Urine
Secondary ID 
A test code used for billing and in test definitions created prior to November 2011
88829
Useful For Suggests clinical disorders or settings where the test may be helpful
Evaluation of patients with abnormal newborn screens showing elevations of C4 to aid in the differential diagnosis of short-chain acyl-CoA dehydrogenase and isobutyryl-CoA dehydrogenase deficiencies
Genetics Test Information Provides information that may help with selection of the correct test or proper submission of the test request
Useful for differential diagnosis of SCAD vs. isobutyryl-CoA dehydrogenase deficiency. The results are not informative when patient is receiving L-carnitine supplements.
Special Instructions and Forms Describes specimen collection and preparation information, test algorithms, and other information pertinent to test. Also includes pertinent information and consent forms to be used when requesting a particular test
Method Name A short description of the method used to perform the test
Flow Injection Analysis-Tandem Mass Spectrometry (FIA-MS/MS)
Reporting Name A shorter/abbreviated version of the Published Name for a test; an abbreviated test name
C4 Acylcarnitine, QN, U
Aliases Lists additional common names for a test, as an aid in searching
Acylcarnitines, urine
Butyrylcarnitine
IBDH
IBDH (isobutyryl-CoA dehydrogenase) deficiency
Iso-butyrylcarnitine
Isobutyryl
Isobutyryl-CoA dehydrogenase (IBDH) deficiency
Isobutyrylcarnitine
SCAD (short chain acyl-CoA dehydrogenase) deficiency
Short chain acyl-CoA dehydrogenase (SCAD) deficiency
Butyrylcarnitine
IBDH
IBDH (isobutyryl-CoA dehydrogenase) deficiency
Iso-butyrylcarnitine
Isobutyryl
Isobutyryl-CoA dehydrogenase (IBDH) deficiency
Isobutyrylcarnitine
SCAD (short chain acyl-CoA dehydrogenase) deficiency
Short chain acyl-CoA dehydrogenase (SCAD) deficiency
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