Who Should Be Screened for Wilson Disease in a Family?

If you have just been diagnosed with Wilson disease, yes, your first-degree relatives—your siblings, children, and parents—should be tested ^[1][2]. Medical guidelines strongly recommend this process, known as “cascade screening,” because finding and treating the disease before symptoms appear can prevent irreversible liver and neurological damage ^[3][1][4]. Even if your family members feel completely healthy, they need to undergo a medical evaluation ^[5].

Understanding the Risk in Your Family

Wilson disease is an autosomal recessive genetic disorder ^[6][7]. This means that for someone to develop the disease, they must inherit two mutated copies of the ATP7B gene—one from each parent ^[8]. The parents are usually “carriers” who have only one mutated gene and do not have the disease themselves.

Because of how these genes are passed down, the risk varies depending on the relationship:

• Siblings: Your brothers and sisters have a 25% (1 in 4) chance of also having Wilson disease ^[5][9]. Because they share the same parents as you, the risk is highest for them.
• Children: Your children will automatically inherit one mutated gene from you, making them carriers. However, they will only develop Wilson disease if your partner also passes down a mutated gene ^[1][9].
• Partners: Because your children’s risk depends on both parents, your doctor may recommend testing your partner for carrier status ^[5][7]. If your partner is not a carrier, your children will not develop the disease, though guidelines may still require baseline screening for the children to be absolutely safe ^[1].
• Parents: While it is rare for a parent to have undetected Wilson disease (since they are typically just carriers), guidelines still recommend screening them ^[1][5].

How Are Family Members Screened?

The specific tests your family will need depend on whether the exact genetic mutations that caused your Wilson disease have been identified.

If your specific genetic mutations are known:
The most reliable approach for screening asymptomatic family members is genetic testing ^[5][10]. A simple blood or saliva test can check if your relatives share the exact same gene mutations that were found in you ^[1].

If your mutations are not known, or if genetic testing is unavailable:
Your family members will need a standard clinical workup to check how their bodies process copper and assess their liver health ^[11][12]. This typically includes:

• Blood tests: To measure levels of a copper-binding protein called ceruloplasmin and to check liver function enzymes ^[1].
• Urine tests: A 24-hour urine collection to measure how much copper is being excreted by the body ^[11].
• Physical exams: An evaluation by a doctor, which may include an eye exam by an ophthalmologist to look for Kayser-Fleischer rings (copper deposits in the eyes) and a neurological assessment ^[12].

A Reassuring Note About Treatment

If a family member is found to have Wilson disease through screening, doctors will typically initiate preventative treatment (such as zinc therapy) immediately, even if they feel perfectly fine and their current copper tests are normal ^[13][4]. Starting treatment early prevents the toxic build-up of copper and allows them to live a long, healthy, and normal life ^[4][14].

When Should Children Be Tested?

While siblings and parents should be tested as soon as possible after your diagnosis, the timeline for your children is a bit different. Screening for children typically begins around age 2 or 3 ^[5][1].

There are a few reasons for this slight delay:

1. Wilson disease almost never causes symptoms or liver damage before this age ^[5].
2. Diagnostic markers (like ceruloplasmin levels) are less reliable in infants, making test results difficult to interpret ^[1].

If your children are younger than 2 or 3, discuss a timeline with a pediatric hepatologist or geneticist to ensure they are tested at the right time.

Navigating Family Conversations

Talking to your family about genetic risk can be overwhelming. Consider asking your doctor to refer you to a genetic counselor. These specialists can help you navigate insurance coverage for your family members and explain the risks clearly. Additionally, you can ask your medical team for a “Family Letter”—a written document that you can hand directly to your relatives, explaining their risk and exactly what tests they need to ask their own doctors for.