A PSEN1 genetic test typically costs around $300 out of pocket in real-world practice, though list prices and insurance outcomes vary widely. PSEN1 is the gene most often responsible for early-onset familial Alzheimer's disease, and testing it usually comes up when a neurologist is working through an unusually young or strongly inherited case. This article covers what the test looks for, what it costs with and without insurance, when a doctor is likely to order it, and the counseling step that most payers now require before they approve it.
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
- What Does a PSEN1 Test Actually Check For?
- What Will the Test Cost?
- When Will a Doctor Refer You for Testing?
- Will Insurance Cover It, and What Do I Need First?
- Why Genetic Counseling Comes Before the Blood Draw
- Frequently Asked Questions
What Does a PSEN1 Test Actually Check For?
PSEN1 is the most common cause of autosomal-dominant familial Alzheimer's disease, a form of the condition that runs in families and tends to start between ages 30 and 60, according to the University of Washington Memory and Brain Wellness Center. Autosomal-dominant means a single copy of the mutated gene, inherited from one parent, is enough to cause the disease, and each child of a carrier has a 50% chance of inheriting it. Because of that early and predictable onset, PSEN1 testing is relevant specifically to early-onset Alzheimer's workups rather than the more common late-onset form that appears after 65.
An Australian clinical reference, Pathology Tests Explained, notes that PSEN1 testing is not useful as a population screening tool or for evaluating typical late-onset Alzheimer's disease — its value is concentrated in families with a clear pattern of early-onset dementia. Labs rarely test PSEN1 in isolation. Most commercial panels test it alongside APP and PSEN2, the two other genes linked to familial Alzheimer's, since all three produce a similar clinical picture and a lab can sequence them together at little extra cost.
What Will the Test Cost?
Prices differ depending on whether you're looking at a lab's list price or what a patient actually pays after insurance. PreventionGenetics, a commercial U.S. lab, lists a base price of $990 for either a PSEN1-only sequencing test or its combined three-gene APP/PSEN1/PSEN2 panel, according to the PreventionGenetics test catalog — meaning the broader panel costs the same as testing PSEN1 alone. That list price is rarely what a patient pays.
A September 2025 clinical presentation from UW Health estimated that real-world out-of-pocket costs for monogenic Alzheimer's gene panels, including PSEN1, typically run around $300, with a possible range from $0 to $1,000 depending on insurance and the lab's financial assistance programs, according to UW Health's Genetic Counseling and Testing in Dementia presentation. The same presentation puts turnaround time at around three weeks. The gap between list price and real-world cost comes down to insurance coverage, lab discount programs, and whether the ordering clinic bills the panel as a bundle. Ask your genetic counselor or ordering clinician for a specific cost estimate before the sample is drawn, since the number depends on your particular plan.
- List price (lab catalog): around $990
- Typical real-world cost after insurance: around $300
- Possible range: $0 to $1,000
- Typical turnaround: about three weeks
When Will a Doctor Refer You for Testing?
Testing decisions for PSEN1 follow a practice guideline jointly issued by the American College of Medical Genetics and Genomics (ACMG) and the National Society of Genetic Counselors (NSGC) in 2011, which both organizations have since reaffirmed — NSGC in 2016 and ACMG by 2019 — as the reference framework clinicians still use, according to ACMG's addendum to the guideline. Payer medical policies built on that guideline, such as Avalon Healthcare Solutions' policy M2038, describe testing as appropriate for two main situations, according to Avalon's policy document: Outside those two scenarios — for example, testing someone with typical late-onset dementia and no strong family history — the guideline does not support ordering the test, and a payer is less likely to cover it.
- A person already diagnosed with dementia at or before age 65, who has a first- or second-degree relative with early-onset dementia, or whose family history is unknown
- A person without symptoms who is a close relative of someone with a confirmed PSEN1, PSEN2, or APP mutation, and who wants to know their own carrier status
Will Insurance Cover It, and What Do I Need First?
Coverage depends entirely on which plan you have, since there is no single national rule. There is no identified Medicare national coverage determination that names PSEN1 specifically, so Medicare Advantage and commercial plans each apply their own medical policy rather than a uniform federal standard, meaning coverage and any prior-authorization requirements have to be confirmed with your specific plan rather than assumed (comparison of Avalon's M2038 policy against other payer policies). Some plans require a documented step before they'll pay for anything.
A Paramount/Elite Medicare Advantage policy makes pre-test genetic counseling a condition of coverage, not just a suggestion — meaning a claim can be denied if that counseling visit never happened or wasn't documented, according to Paramount's policy PG0441. Other insurers take a harder line regardless of counseling. Excellus BlueCross BlueShield and Univera Healthcare classify familial Alzheimer's genetic testing — covering PSEN1, PSEN2, and APP — as not medically necessary in their commercial policies, according to Excellus BCBS's policy. That means a denial is a realistic outcome even for a patient who otherwise fits the clinical criteria above, so it's worth calling your plan directly before scheduling the test.
Why Genetic Counseling Comes Before the Blood Draw
Genetic counseling before testing isn't paperwork — it's where the implications get worked through before results arrive. Pathology Tests Explained recommends professional genetic counseling before PSEN1 testing, especially when the test is predictive, meaning it's done on a currently healthy relative of a known carrier rather than someone already showing symptoms, according to the same clinical reference.
A counselor walks through what a positive result means for the person tested, what it implies for their children, and how it could affect life insurance or long-term planning, before the sample is ever collected. For the asymptomatic-relative scenario described in Section 3, this conversation matters most, since a healthy person is choosing whether to learn information that cannot be undone once known. Given the counseling requirement built into some payer policies and the simple fact that results carry weight for an entire family, ask your referring clinician whether genetic counseling is bundled into the testing order or needs to be scheduled as its own visit.
Frequently Asked Questions
Is PSEN1 testing useful for a typical late-onset Alzheimer's diagnosis?
No. Pathology Tests Explained states it is not useful as a population screen or for late-onset Alzheimer's disease; its value is limited to early-onset, strongly familial cases.
Does testing PSEN1 alone cost less than the full three-gene panel?
No. PreventionGenetics lists the same $990 base price for PSEN1 alone and for the combined APP/PSEN1/PSEN2 panel.
Can a healthy person get tested if a relative already has a confirmed PSEN1 mutation?
Yes. Avalon's policy M2038 describes this predictive testing of asymptomatic relatives as an appropriate use case, typically alongside genetic counseling.
