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Lithium

Tripeptidyl Peptidase 1

The Tripeptidyl Peptidase 1 (TPP1) test is a specialized diagnostic tool used primarily in the diagnosis of Late Infantile Neuronal Ceroid Lipofuscinosis (LINCL), a type of Batten disease. Batten disease is a rare, fatal autosomal recessive neurodegenerative disorder that begins in childhood. It is named after the British pediatrician who first described it in 1903. Also known as Jansky-Bielschowsky disease, LINCL typically begins between ages 2 and 4.

TPP1 is an enzyme that breaks down proteins inside lysosomes, structures within cells that digest and recycle different types of molecules. Mutations in the TPP1 gene result in the production of an abnormally short, nonfunctional version of the TPP1 enzyme or the complete absence of the enzyme. Without the TPP1 enzyme, proteins and lipids accumulate inside lysosomes, which is thought to trigger a series of events leading to the death of nerve cells and other symptoms associated with Batten disease.


  • Test NameTripeptidyl Peptidase 1
  • Sample TypeBlood
  • Preparations RequiredNo special preparation is needed before this test.
  • Report Time12 Days

Why is the Tripeptidyl Peptidase 1 (TPP1) test done?

The TPP1 test is done to diagnose Late Infantile Neuronal Ceroid Lipofuscinosis (LINCL), a type of Batten disease. It can help doctors confirm a diagnosis and guide treatment decisions.

How is the TPP1 test performed?

The test is done using a blood sample. The sample is sent to a laboratory where the level of TPP1 enzyme is measured.

Home Sample Collection Process

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Sample Collection by Phlebotomist
Sample Collection by Phlebotomist
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Reporting of the sample at lab
Reporting of the sample at lab
4
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Frequently Asked Questions

Low levels of TPP1 may indicate the presence of Late Infantile Neuronal Ceroid Lipofuscinosis (LINCL). However, the results need to be interpreted in conjunction with clinical findings and other diagnostic tests.

The test itself has minimal risks, similar to those associated with a regular blood draw. This may include slight pain or bruising at the site of needle insertion.

No, this test requires professional medical expertise for both the collection of the sample and interpretation of results. It should be conducted in a healthcare setting.

While there's currently no cure for LINCL, treatment focuses on relieving symptoms and providing supportive care. Physical therapy, occupational therapy, speech therapy, and nutritional support can help manage symptoms.

Batten disease is an inherited disorder. Individuals with a family history of Batten disease are at a higher risk.

The TPP1 test is a diagnostic test, not a prognostic one. While it can confirm a diagnosis of LINCL, it cannot predict the course or severity of the disease.

The TPP1 test is highly accurate in diagnosing LINCL. However, it's typically used in conjunction with other tests and clinical findings to confirm the diagnosis.

Numerous research studies are being conducted on LINCL, with many focusing on understanding the genetic mutations that cause the disease and developing new treatment strategies, including gene therapy and enzyme replacement therapy.

While lifestyle changes won't cure LINCL, certain strategies can help manage symptoms. This can include regular physical therapy, maintaining a balanced diet, and getting plenty of rest.

The frequency of testing depends on your doctor's advice. Once a diagnosis of LINCL is confirmed, further TPP1 tests may not be necessary.

Additional tests might include genetic testing, neurological assessments, eye exams, and brain imaging, among others.

Pregnant women can safely undergo the TPP1 test, as it involves a standard blood draw.

Numerous support groups and organizations exist to help individuals and families affected by LINCL and other forms of Batten disease. These provide resources for coping with the disease and can connect you with others facing similar challenges.

Coverage for the TPP1 test will depend on your health insurance plan. You should contact your insurance provider to understand your coverage for this test.

While the TPP1 test is primarily a diagnostic tool, in some cases it may be used to monitor the progression of the disease and the response to treatment. However, this usage is less common and should be discussed with your healthcare provider.

The turnaround time for TPP1 test results is usually 7 to 14 days, but this can vary based on the laboratory performing the test.

While the TPP1 test is a standard diagnostic tool for LINCL, other tests such as genetic testing and certain imaging tests may also be used to help confirm a diagnosis.

Yes, genetic counseling is often recommended for individuals and families affected by LINCL. A genetic counselor can provide information about the disease, discuss the chances of passing the disease to future generations, and provide information on relevant research and clinical trials.

While a negative result can significantly reduce the likelihood of LINCL, it doesn't entirely rule out the disease as other factors may be involved. It's important to discuss your results with your healthcare provider to understand their implications fully.

As with any test, there's a small chance of false-positive or false-negative results with the TPP1 test. However, these instances are rare, and the test is generally considered very reliable.

Yes, the TPP1 test can be done on individuals of any age, including newborns and infants.

LINCL is an autosomal recessive disorder, which means both parents must carry a copy of the mutated gene and pass it on to their child. If both parents are carriers, each child has a 25% chance of having the disease.

There's no specific diet for individuals with LINCL. However, maintaining a balanced and nutritious diet can help support overall health. In some cases, a dietitian may be involved in care to ensure nutritional needs are being met.

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