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Unit Code 88829:
C4 Acylcarnitine, Quantitative, Urine

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Useful For

Evaluation of patients with abnormal newborn screens showing

elevations of C4 to aid in the differential diagnosis of SCAD

deficiency and IBD deficiency

Testing Guides and Forms

• Newborn Screening Follow-up for Isolated C4 Acylcarnitine Elevations (also applies to any plasma C4 acylcarnitine elevations) 

Method Name

Flow Injection Analysis-Tandem Mass Spectrometry (MS/MS)
Stable Isotope Dilution

Reporting Name

C4 Acylcarnitine, QN, U

Ordering Mnemonic

C4U

Aliases

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

Key