A PSEN2 test during an Alzheimer's workup looks for an inherited early-onset cause, and doctors order it only when family history points that way. Cost depends on panel size, test method, prior authorization, and coverage rules, so referral details often decide approval. PSEN2 is a gene linked to early-onset familial Alzheimer disease. MedlinePlus Genetics lists it with APP and PSEN1 as genes where harmful variants cause that inherited form, so testing focuses on suspected familial cases MedlinePlus Alzheimer disease page.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- When does PSEN2 testing fit?
- What test will the lab run?
- What decides cost and coverage?
- What should you bring to the referral?
When does PSEN2 testing fit?
PSEN2 testing fits when symptoms start early, often before age 65, or when several relatives had early memory loss. A clinician looks for an autosomal-dominant pattern, meaning the disease appears in each generation.
Routine late-onset workups usually do not include PSEN2. ARUP Consult states its early-onset Alzheimer panel should not be ordered when symptoms began after age 65 ARUP Consult early-onset Alzheimer panel guide.
What test will the lab run?
Most labs test PSEN2 as part of a dementia gene panel, not as a single-gene test. The panel uses next-generation sequencing, sometimes with copy-number analysis, to read several genes at once.
PreventionGenetics offers PSEN2 in a 20-gene Dementia Plus APOE panel with a 2–3-week turnaround, or 7–16 days STAT, for suspected dementia with onset before 65 or family history PreventionGenetics Dementia Plus APOE panel catalog. When a family mutation is already known, the lab may instead test only that single variant.
What decides cost and coverage?
The bill usually reflects the full panel, not PSEN2 alone. Coverage depends on medical-necessity rules, prior authorization, and whether the patient meets family-history or age criteria.
Some insurer policies add strict gates. BlueCross BlueShield of South Carolina CAM 287 requires genetic counseling before and after familial Alzheimer testing and covers APP, PSEN1, and PSEN2 testing only for defined reproductive, family-history, or early-onset indications BlueCross BlueShield of South Carolina CAM 287 policy. Ask the ordering clinic whether authorization is approved before blood is drawn.
What should you bring to the referral?
Bring a clear family history with ages at onset. Include prior genetic reports, especially any known APP, PSEN1, or PSEN2 variant in a relative. Confirm which lab will run the panel and how results will be returned to you and your family.
- Age at first symptoms and how diagnosis was made
- Three-generation pedigree with ages affected and causes of death
- Any known familial variant and copies of prior test reports
- Whether pre- and post-test counseling is scheduled
- Whether prior authorization is approved, and whether single-variant or full-panel testing was ordered
