Card kit

Invitae Elevated Phenylalanine (Hyperphenylalaninemia) Panel

Test code: 06145

Test description

The Invitae Elevated Phenylalanine (Hyperphenylalaninemia) Panel analyzes genes that are known to cause increased phenylalanine levels on newborn screening (NBS) or plasma amino acid analysis. Hyperphenylalaninemia is most commonly due to impaired function of phenylalanine hydroxylase (PAH), the enzyme that catabolizes the amino acid phenylalanine to tyrosine, but it can also be caused by defects in the regeneration or biosynthesis of the enzyme co-factor tetrahydrobiopterin (BH4).

Any individual with a positive newborn screen for phenylketonuria (PKU), elevated plasma phenylalanine, abnormal urine pterins (tetrahydrobiopterin compounds), or a suspected diagnosis of hyperphenylalaninemia based on clinical presentation or laboratory results should be tested for hyperphenylalaninemias. Age of diagnosis and subsequent metabolic management are some of the greatest determinants of long-term outcome.

Disorders tested

Ordering information

Turnaround time:

10–21 calendar days (14 days on average)

New York approved:

Yes

Preferred specimen:

3mL whole blood in a purple-top EDTA tube (K2EDTA or K3EDTA)

Alternate specimens:

Saliva, buccal swab, and gDNA are also accepted.
Learn more about specimen requirementsRequest a specimen collection kit

Clinical description

To view the complete clinical description of this panel, click here.

Clinical description

Assay information

Invitae is a College of American Pathologists (CAP)-accredited and Clinical Laboratory Improvement Amendments (CLIA)-certified clinical diagnostic laboratory performing full-gene sequencing and deletion/duplication analysis using next-generation sequencing technology (NGS).

Our sequence analysis covers clinically important regions of each gene, including coding exons and 10 to 20 base pairs of adjacent intronic sequence on either side of the coding exons in the transcript listed below, depending on the specific gene or test. In addition, the analysis covers select non-coding variants. Any variants that fall outside these regions are not analyzed. Any limitations in the analysis of these genes will be listed on the report. Contact client services with any questions.

Based on validation study results, this assay achieves >99% analytical sensitivity and specificity for single nucleotide variants, insertions and deletions <15bp in length, and exon-level deletions and duplications. Invitae's methods also detect insertions and deletions larger than 15bp but smaller than a full exon but sensitivity for these may be marginally reduced. Invitae’s deletion/duplication analysis determines copy number at a single exon resolution at virtually all targeted exons. However, in rare situations, single-exon copy number events may not be analyzed due to inherent sequence properties or isolated reduction in data quality. Certain types of variants, such as structural rearrangements (e.g. inversions, gene conversion events, translocations, etc.) or variants embedded in sequence with complex architecture (e.g. short tandem repeats or segmental duplications), may not be detected. Additionally, it may not be possible to fully resolve certain details about variants, such as mosaicism, phasing, or mapping ambiguity. Unless explicitly guaranteed, sequence changes in the promoter, non-coding exons, and other non-coding regions are not covered by this assay. Please consult the test definition on our website for details regarding regions or types of variants that are covered or excluded for this test. This report reflects the analysis of an extracted genomic DNA sample. In very rare cases, (circulating hematolymphoid neoplasm, bone marrow transplant, recent blood transfusion) the analyzed DNA may not represent the patient's constitutional genome.

Assay information

Order test

You can customize this test by clicking genes to remove them.

Primary panel

8 genes selected
DNAJC12
GCH1
PAH
PCBD1
PTS
QDPR
SLC25A13
SPR

Question about billing? 

Find answers