The test measures CXM — a breakdown product of Collagen X found in blood serum. Collagen X is produced specifically during active growth plate activity in long bones. The concentration of CXM in blood directly correlates with how fast your child's bones are currently growing, giving you a real-time snapshot of growth velocity rather than a prediction based on averages. Think of CXM as the exhaust of the engine of growth- the faster a child grows, the more CXM is released in the blood and measured by our proprietary COL-10 blood test.

No. We work with a virtual physician network that reviews and approves each test order. This allows us to make the test legally available in all 50 states without requiring you to visit a doctor's office first. The entire authorization process happens digitally when you scan the QR code to activate your kit.

The kit includes a small lancet device (like those used for home glucose testing) to obtain a tiny finger-prick blood sample. Most children compare it to a brief pinch. A few drops of blood are placed on a dried blood spot collection card — the same technology used in newborn screening programs. The whole process takes under 2 minutes. We ask that parents provide two separate blood spots per card on differnt days for a more accurate average of daily growth variation. The $99 fee covers both tests and the average value of the test will be used to calculate your child's CXM percentile based on their age and gender.

The CXM biomarker is exceptionally stable once blood is dried onto the collection card. Unlike many other biological tests that require cold-chain transport or special handling, dried blood spot samples can be safely and reliably shipped at room temperature through standard mail. This stability is one of the key reasons this test can be offered as an at-home kit. The completed Dried Blood Spot card is inserted into a zip-loc bag which is then inserted into a pre-stamped mailing envelope for shipment to our centralized CLIA certified testing facility.

Matrikine LLC is expected to ship dried blood spot collection kits in June 2026. We will keep you informed if there are any delays in shipping and an email with tracking will be sent to you as soon as the kits are mailed out.

The CXM test is most informative for children ages 6–18, covering the primary window of pubescent growth. CXM levels naturally decline as growth plates close, so the test is most valuable during the active growing years. Children under 6 years of age can be can be tested for CXM as well, but the data generated is more variable due to the fast rate of growth these children are experiencing, therefore the data may not be very useful.

We treat your child's biological data with the same strict confidentiality standards as any clinical laboratory result. Data is never sold to third parties. Our laboratory operates under CLIA regulations which include strict requirements for patient data protection. Full privacy policy details are available on our corporate site at matrikine.com.

The test measures CXM — a breakdown product of Collagen X found in blood serum. Collagen X is produced specifically during active growth plate activity in long bones. The concentration of CXM in blood directly correlates with how fast your child's bones are currently growing, giving you a real-time snapshot of growth velocity rather than a prediction based on averages. Think of CXM as the exhaust of the engine of growth- the faster a child grows, the more CXM is released in the blood and measured by our proprietary COL-10 blood test.

No. We work with a virtual physician network that reviews and approves each test order. This allows us to make the test legally available in all 50 states without requiring you to visit a doctor's office first. The entire authorization process happens digitally when you scan the QR code to activate your kit.

The kit includes a small lancet device (like those used for home glucose testing) to obtain a tiny finger-prick blood sample. Most children compare it to a brief pinch. A few drops of blood are placed on a dried blood spot collection card — the same technology used in newborn screening programs. The whole process takes under 2 minutes. We ask that parents provide two separate blood spots per card on differnt days for a more accurate average of daily growth variation. The $99 fee covers both tests and the average value of the test will be used to calculate your child's CXM percentile based on their age and gender.

The CXM biomarker is exceptionally stable once blood is dried onto the collection card. Unlike many other biological tests that require cold-chain transport or special handling, dried blood spot samples can be safely and reliably shipped at room temperature through standard mail. This stability is one of the key reasons this test can be offered as an at-home kit. The completed Dried Blood Spot card is inserted into a zip-loc bag which is then inserted into a pre-stamped mailing envelope for shipment to our centralized CLIA certified testing facility.

Matrikine LLC is expected to ship dried blood spot collection kits in June 2026. We will keep you informed if there are any delays in shipping and an email with tracking will be sent to you as soon as the kits are mailed out.

The CXM test is most informative for children ages 6–18, covering the primary window of pubescent growth. CXM levels naturally decline as growth plates close, so the test is most valuable during the active growing years. Children under 6 years of age can be can be tested for CXM as well, but the data generated is more variable due to the fast rate of growth these children are experiencing, therefore the data may not be very useful.

We treat your child's biological data with the same strict confidentiality standards as any clinical laboratory result. Data is never sold to third parties. Our laboratory operates under CLIA regulations which include strict requirements for patient data protection. Full privacy policy details are available on our corporate site at matrikine.com.