Vitamin D DeficiencyNCT07565064
ALPCO 25(OH) Vitamin D CLIA Kit - Fresh Versus Frozen Serum and Plasma Stability Study
An observational study of Vitamin D Deficiency and Vitamin D Insufficiency, run by American Laboratory Products Company at 1 site in United States.
Trial summary
This study evaluates the stability of 25-hydroxyvitamin D [25(OH)D] measurements in human serum and plasma using the ALPCO 25(OH) Vitamin D CLIA Kit. The study compares results obtained from fresh specimens with those obtained after storage under various temperature and time conditions, including long-term frozen… Read more about this study
- Who is it for?
- Ages 22 years and olderHealthy volunteers can take part
- Conditions the study is for
- Vitamin D Deficiency, Vitamin D Insufficiency, Healthy Volunteers
- What is being tested?
- ALPCO 25(OH) Vitamin D CLIA Kit
- Type of treatment
- Medical device
- How many people
- 80 participants
- Where
- 1 siteUnited States
- Study dates
- 18 Apr 2026to Dec 2026
- Phase
- Observational
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 22 years and older
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Study population: The study population will consist of adult volunteers from the general population, aged 22 years and older, who are able and willing to provide a blood sample. Participants are expected to represent a range of 25-hydroxyvitamin D [25(OH)D] levels, including deficient, insufficient, and sufficient concentrations. Subjects will be enrolled at clinical collection sites in the United States and will undergo a single blood draw for specimen collection.
Who may be able to join
- Male or female adults 22 years of age or older
- Able and willing to provide a blood sample in accordance with the protocol
- Able to understand the study requirements and provide written informed consent
Who cannot join
- Unable or unwilling to provide a blood sample
- Current participation in another investigational study that may interfere with study results
- Any condition that, in the opinion of the investigator, would preclude safe participation or compromise the integrity of the study
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
About this study
This study evaluates the stability of 25-hydroxyvitamin D [25(OH)D] measurements in human serum and plasma using the ALPCO 25(OH) Vitamin D CLIA Kit. The study compares results obtained from fresh specimens with those obtained after storage under various temperature and time conditions, including long-term frozen storage and short-term handling scenarios. The objective is to demonstrate that specimen storage conditions do not result in clinically meaningful differences in measured 25(OH)D concentrations, supporting the use of fresh and previously stored samples in laboratory testing.
Read the detailed description
This clinical study is designed to assess the analytical stability of 25-hydroxyvitamin D [25(OH)D] in human serum and plasma specimens under defined storage conditions using the ALPCO 25(OH) Vitamin D CLIA Kit, a competitive chemiluminescent immunoassay performed on the KleeYa automated platform.
The study consists of two cohorts. Cohort 1 evaluates long-term stability of 25(OH)D in human serum specimens following storage at ultra-low temperatures (-80°C). Approximately 30 donor-derived serum samples representing clinically relevant vitamin D levels (deficient, insufficient, and sufficient) will be tested at baseline and after storage for predefined time points up to six months. The objective of this cohort is to demonstrate equivalence between fresh and frozen specimens following a single freeze-thaw cycle.
Cohort 2 evaluates short-term stability of 25(OH)D in both serum and plasma specimens under multiple temperature conditions (2-8°C, 22°C, 37°C, and -80°C) over a defined period of up to 31 days. Approximately 10 donor-derived specimens will be tested at baseline and at predefined intervals to assess the impact of sample handling and storage conditions relevant to routine laboratory workflows.
Adult participants (≥22 years of age) will provide a single blood sample collected via standard venipuncture. Specimens will be processed, aliquoted, and tested according to protocol-defined procedures. The primary endpoint is the equivalence of 25(OH)D measurements between fresh and stored specimens. Data analysis will include descriptive and comparative statistical methods, including percent difference and mean bias, to evaluate stability across conditions.
This is a minimal-risk study involving no therapeutic intervention. Results are intended to support analytical performance claims, including specimen handling and storage conditions described in the assay Instructions for Use. No clinical benefit to participants is expected, and study results will not be used for medical decision-making.
- Being tested
- ALPCO 25(OH) Vitamin D CLIA Kit
- Keywords
- 25-hydroxyvitamin D, 25(OH)D, Vitamin D, Serum Stability, Plasma Stability, Specimen Storage, Freeze-Thaw Stability, Biomarker Stability, Chemiluminescent Immunoassay, CLIA Assay, Laboratory Diagnostics, Pre-analytical Variables, Sample Handling, Analytical Performance
- Medical subject headings
- Vitamin D Deficiency
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
ALPCO 25(OH) Vitamin D CLIA KitDevice
An in vitro diagnostic chemiluminescent immunoassay used for the quantitative measurement of 25-hydroxyvitamin D [25(OH)D] in human serum and plasma specimens. The device is used for analytical testing only and not for clinical decision-making.
| Study group | Role | What they receive |
|---|---|---|
| Cohort 1 - Long-Term Frozen Stability | Serum specimens derived from adult donors will be evaluated for long-term stability of 25(OH) vitamin D following storage at -80°C. Samples will be tested at baseline and after predefined storage intervals up to 6 months. Receives: Device: ALPCO 25(OH) Vitamin D CLIA Kit | |
| Cohort 2 - Short-Term Stability | Serum and plasma specimens derived from adult donors will be evaluated for short-term stability of 25(OH) vitamin D under multiple storage conditions (2-8°C, 22°C, 37°C, and -80°C) over a defined study period. Receives: Device: ALPCO 25(OH) Vitamin D CLIA Kit |
What is being measured
The primary outcome is the main question the study is designed to answer.
Equivalence of 25-hydroxyvitamin D [25(OH)D] measurements between fresh and stored specimens
Assessment of agreement between 25(OH)D concentrations measured in fresh serum and plasma specimens and those measured after storage under predefined temperature and time conditions, using the ALPCO 25(OH) Vitamin D CLIA Kit. Stability will be evaluated using percent difference, mean bias, and variability across time points.
Measured: Up to 6 months
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted4 May 2026
- Study start18 Apr 2026
- Primary completionDec 2026 (estimated)
- Study completionDec 2026 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Vitamin D DeficiencyStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Cohort
- Time perspective
- Prospective
- Enrolment
- 80 participants (estimated)
Sponsor and investigators
- Lead sponsor
- American Laboratory Products Company
- Sponsor type
- Industry (pharma, biotech, devices)
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07565064
- Sponsor's protocol ID
- CPSP-2025-030
- Status last verified
- Apr 2026
- First submitted
- 27 Apr 2026
- Last updated
- 4 May 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- Yes
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 4 May 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- ALPCO 25(OH) Vitamin D CLIA Kit - Fresh Versus Frozen Serum and Plasma Stability Study
- ClinicalTrials.gov ID
- NCT07565064
- Acronym / sponsor ID
- CPSP-2025-030
- Keywords
- 25-hydroxyvitamin D, 25(OH)D, Vitamin D, Serum Stability, Plasma Stability, Specimen Storage, Freeze-Thaw Stability, Biomarker Stability
- Study type
- Observational
- Recruitment status
- Enrolling by invitation
- Enrolment
- 80 participants (estimated)
- Lead sponsor
- American Laboratory Products CompanyIndustry (pharma, biotech, devices)
- Study start
- 18 Apr 2026 (actual)
- Primary completion
- Dec 2026 (estimated)
- Study completion
- Dec 2026 (estimated)
- First posted
- 4 May 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This study evaluates the stability of 25-hydroxyvitamin D [25(OH)D] measurements in human serum and plasma using the ALPCO 25(OH) Vitamin D CLIA Kit. The study compares results obtained from fresh specimens with those obtained after storage under various temperature and time conditions, including long-term frozen storage and short-term handling scenarios. The objective is to demonstrate that specimen storage conditions do not result in clinically meaningful differences in measured 25(OH)D concentrations, supporting the use of fresh and previously stored samples in laboratory testing.
Detailed description
This clinical study is designed to assess the analytical stability of 25-hydroxyvitamin D [25(OH)D] in human serum and plasma specimens under defined storage conditions using the ALPCO 25(OH) Vitamin D CLIA Kit, a competitive chemiluminescent immunoassay performed on the KleeYa automated platform.
The study consists of two cohorts. Cohort 1 evaluates long-term stability of 25(OH)D in human serum specimens following storage at ultra-low temperatures (-80°C). Approximately 30 donor-derived serum samples representing clinically relevant vitamin D levels (deficient, insufficient, and sufficient) will be tested at baseline and after storage for predefined time points up to six months. The objective of this cohort is to demonstrate equivalence between fresh and frozen specimens following a single freeze-thaw cycle.
Cohort 2 evaluates short-term stability of 25(OH)D in both serum and plasma specimens under multiple temperature conditions (2-8°C, 22°C, 37°C, and -80°C) over a defined period of up to 31 days. Approximately 10 donor-derived specimens will be tested at baseline and at predefined intervals to assess the impact of sample handling and storage conditions relevant to routine laboratory workflows.
Adult participants (≥22 years of age) will provide a single blood sample collected via standard venipuncture. Specimens will be processed, aliquoted, and tested according to protocol-defined procedures. The primary endpoint is the equivalence of 25(OH)D measurements between fresh and stored specimens. Data analysis will include descriptive and comparative statistical methods, including percent difference and mean bias, to evaluate stability across conditions.
This is a minimal-risk study involving no therapeutic intervention. Results are intended to support analytical performance claims, including specimen handling and storage conditions described in the assay Instructions for Use. No clinical benefit to participants is expected, and study results will not be used for medical decision-making.
Study design
- Observational model
- Cohort
- Time perspective
- Prospective
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Cohort 1 - Long-Term Frozen Stability | – | Device: ALPCO 25(OH) Vitamin D CLIA KitSerum specimens derived from adult donors will be evaluated for long-term stability of 25(OH) vitamin D following storage at -80°C. Samples will be tested at baseline and after predefined storage intervals up to 6 months. |
| Cohort 2 - Short-Term Stability | – | Device: ALPCO 25(OH) Vitamin D CLIA KitSerum and plasma specimens derived from adult donors will be evaluated for short-term stability of 25(OH) vitamin D under multiple storage conditions (2-8°C, 22°C, 37°C, and -80°C) over a defined study period. |
Who may qualify
- Ages
- 22 years and older
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
- Study population
- The study population will consist of adult volunteers from the general population, aged 22 years and older, who are able and willing to provide a blood sample. Participants are expected to represent a range of 25-hydroxyvitamin D [25(OH)D] levels, including deficient, insufficient, and sufficient concentrations. Subjects will be enrolled at clinical collection sites in the United States and will undergo a single blood draw for specimen collection.
Key inclusion criteria (3 listed)
- Male or female adults 22 years of age or older
- Able and willing to provide a blood sample in accordance with the protocol
- Able to understand the study requirements and provide written informed consent
Key exclusion criteria (3 listed)
- Unable or unwilling to provide a blood sample
- Current participation in another investigational study that may interfere with study results
- Any condition that, in the opinion of the investigator, would preclude safe participation or compromise the integrity of the study
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| ALPCO 25(OH) Vitamin D CLIA KitAn in vitro diagnostic chemiluminescent immunoassay used for the quantitative measurement of 25-hydroxyvitamin D [25(OH)D] in human serum and plasma specimens. The device is used for analytical testing only and not for clinical decision-making. | Device | Cohort 1 - Long-Term Frozen Stability, Cohort 2 - Short-Term Stability |
Primary outcome
Equivalence of 25-hydroxyvitamin D [25(OH)D] measurements between fresh and stored specimens
Time frame: Up to 6 months
Assessment of agreement between 25(OH)D concentrations measured in fresh serum and plasma specimens and those measured after storage under predefined temperature and time conditions, using the ALPCO 25(OH) Vitamin D CLIA Kit. Stability will be evaluated using percent difference, mean bias, and variability across time points.
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 4 May 2026.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Vitamin D Deficiency and Vitamin D Insufficiency, run by American Laboratory Products Company at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 3 inclusion and 3 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: enrolling by invitation, as of the sponsor's last update on 4 May 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Equivalence of 25-hydroxyvitamin D [25(OH)D] measurements between fresh and stored specimens (time frame: Up to 6 months). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 4 May 2026; AzTrials last refreshed its copy on 26 Oct 2026.