Days Set Up
Monday – Thursday
Analytic Time

5-12 days

MiChart Code
PIK3CA Mutation
Soft Order Code

Test Updated:


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All specimens should be accompanied by a requisition.

Submitting Specimens

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MLabs provides all the supplies necessary for the collection of specimens.

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Test Overview

Test Methodology

Next-Generation Sequencing

Test Usage

PIK3CA encodes one of the catalytic subunits of phosphatidylinositol 3-kinase (PI3K), a lipid kinase involved in PI3K-AKT-mTOR signaling. PIK3CA mutations resulting in increased PI3K catalytic activity and oncogenic transformation are well-described in many types of cancer. The detection of these mutations can have important treatment implications. Alpelisib (Piqray) is FDA-approved for the treatment of postmenopausal patients with HR+, HER2-, PIK3CA-mutated metastatic breast cancer following progression on or after endocrine-based therapy. This DNA test is performed by targeted next-generation sequencing (NGS) and will detect PIK3CA mutations within the sequenced regions of exons 2, 5, 6, 8, 10, 14, 19 and 21 (NM_006218). Commonly mutated codons covered by this assay include R88, N345, C420, E542, E545, Q546 and H1047. See below for more information regarding sequenced regions of PIK3CA.

Reference Range

Interpretive report provided.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Offsite

For formalin-fixed, paraffin-embedded tissue, a block containing an area with a high percentage of neoplastic cells (for micro-/macro-dissection) is preferred. Unstained, UNBAKED slides (5-8, 10-micron slides; 10-15 if few neoplastic cells are present) with associated H&E stained slide are also acceptable. Decalcified tissue or other fixatives will be accepted and the assay attempted; however, these may result in failed testing due to degraded nucleic acid. Both blocks and slides should be stored at room temperature. A Diff-Quik or Papanicolaou stained aspirate smear (preferable containing a high percentage and overall amount of neoplastic cells) is also acceptable. Store at room temperature

Normal Volume
Formalin-fixed, paraffin-embedded tissue; Diff-Quik stained aspirate smear, Papanicolaou stained aspirate smear. Extracted DNA is also acceptable if extracted in a CLIA certified laboratory.
Minimum Volume

Billing Information

CPT Code
81309, 88381-TC
Pro Fee Code
G0452-26, 88381-26

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.