The validated methods were proved effective for the simultaneous study of a large number of metabolites which are commonly present in urine samples and are used for detecting IEM. The evaluation was done by searching diagnostic profiles with multiple markers to increase sensitivity and specificity (e.g., acylcarnitines plus amino acids) or with specific urine markers (cystine, homogentisic acid, sialic acid, N-acetylaspartic acid, etc.).
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