Request / Find a Test Tool

The National Genomic Test Directories specify which genomic tests are commissioned by the NHS in England, to be delivered by Genomic Laboratory Hubs.

This tool allows clinical teams to search all of the genomic tests available to patients through the National Testing Directory. From here you can find out more details about each test and information about how to order them. These tests can only be ordered by clinical teams, if you are a patient looking to request a test please speak to your clinical team directly.

Isovaleric acidaemia

Clinical Indication ID & Name


Isovaleric acidaemia

Test Group


Test code


Test name


Target genes

IVD common pseudodeficiency variant

Test scope


Test method/ technology

Targeted mutation testing

Optimal Family Structure


Eligibility Criteria

Likely isovaleric acidaemia identified following neonatal screening or diagnostic metabolic testing
Referrals for testing will be triaged by the Genomic Laboratory; testing should be targeted at those where a genetic or genomic diagnosis will guide management for the proband or family. In the case of isovaleric acidaemia, this means that testing is almost exclusively used at those in whom biochemical results indicate a likely pseudodeficiency allele is present.

Commissioning group

Newborn Screening

Overlapping idications


Address for samples/request forms

North Thames GLH, Rare & Inherited Disease Genomic Laboratory
Specimen Reception, Level 5 Barclay House, 37 Queen Square,
London WC1N 3BH

Contact with queries

Supporting documents


Education resources


Service updates


Request form download

Consent record

See consent guidance in test request form

Sample requirements

See sample guidance in test request form