Diabetes InsipidusNCT00757276
Copeptin in the Diagnosis and Differential Diagnosis of Diabetes Insipidus. The CoSIP-Study
An observational study of Diabetes Insipidus, run by University Hospital, Basel, Switzerland at 1 site in Switzerland.
Trial summary
Evaluation of Copeptin in the differential diagnosis of diabetes insipidus. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Diabetes Insipidus
- How many people
- 50 participants
- Where
- 1 siteSwitzerland
- Study dates
- Jun 2008to Oct 2014
- Phase
- Observational
- Are there results?
- None posted in the registry
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 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Study population: All patients >18 years who are tested for the diagnosis of DI because of a history of polyuria (>40ml/kg per 24 hours) in the presence of polydipsia Patients with known DI will be contacted whether they agree to participate in the study and to undergo again a water deprivation test to measure copeptin to confirm the diagnosis.
Who may be able to join
- All patients > 18 years who are tested for the diagnosis of DI because of a history of polyuria (> 40 ml/kg per 24 hours) in the presence of polydipsia Patients with known DI will be contacted whether they agree to participate in the study and to undergo again a water deprivation test to measure copeptin to confirm the diagnosis.
Who cannot join
- Polyuria of other origin, i.e. prostate hyperplasia, diabetes mellitus.
- Pregnancy
- The investigators do not perform the water deprivation test in patients with: *renal insufficiency
- uncontrolled diabetes mellitus
- hypovolemia of any cause
- uncorrected deficiency of adrenal or thyroid hormones
- No informed consent
Trial locations and contacts
1 site in 1 country.
About this study
Evaluation of Copeptin in the differential diagnosis of diabetes insipidus.
Read the detailed description
Background:
Plasma arginine vasopressin (AVP) measurement is recommended for the differential diagnosis of diabetes insipidus and polydipsia. However, AVP measurement is cumbersome. AVP is derived from a larger precursor peptide along with copeptin, which is a more stable peptide directly mirroring the production of AVP. Copeptin can be assayed readily in plasma.
Aim: To evaluate the diagnostic accuracy of copeptin levels in the diagnosis and differential diagnosis of diabetes insipidus.
Design: Prospective, observational multicenter study.
Setting: Department of Endocrinology, University Hospital of Basel
Patients: Patients with suspected or known central (complete or partial), nephrogenic (complete or partial) or psychogenic diabetes insipidus undergoing a standardized water deprivation test.
Intervention: All patients with suspected or known diabetes insipidus will undergo an overnight water deprivation test and a standardized water deprivation test, as routinely performed in the diagnostic evaluation of diabetes insipidus. Plasma AVP and copeptin will be measured at baseline (8 am before start of thirsting), and hourly during the water deprivation test.
Study hypothesis: Copeptin levels will provide a better diagnostic accuracy in the diagnosis and differential diagnosis of diabetes insipidus as compared to AVP measurement.
Analysis: We will study 5 groups of patients: A) Patients with complete central diabetes insipidus, B) Patients with partial central diabetes insipidus, C) Patients with complete nephrogenic diabetes insipidus, D) Patients with partial nephrogenic diabetes insipidus and E) Patients with psychogenic diabetes insipidus. All groups will consist of 10 patients based on the following assumptions: Based on pilot studies we assume that patients in group A) will have copeptin values of 2.5 ± 1.0; Group B) 3.0 ± 1.0, Group C) 15.0 ± 5; Group D) 6 ± 2.0 and Group E) 4.0 ± 1.0 pmol/L. This results in a power of 90% to detect a difference in copeptin levels of 0.8pmol/L between the closest two groups, i.e. patients with partial central Diabetes insipidus and patients with psychogenic Diabetes insipidus.
Significance: The measurement of copeptin will allow a better discrimination of patients with diabetes insipidus, especially for the discrimination of partial central and nephrogenic and psychogenic diabetes insipidus.
- Conditions
- Diabetes Insipidus
- Keywords
- Copeptin, Diabetes insipidus, diagnostic marker, Vasopressin, antidiuretic hormone (ADH)
- Medical subject headings
- Diabetes Insipidus
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
| Study group | Role | What they receive |
|---|---|---|
| 1 | All patients > 18 years who are tested for the diagnosis of DI because of a history of polyuria (> 40 ml/kg per 24 hours) in the presence of polydipsia Patients with known DI will be contacted whether they agree to participate in the study and to undergo again a water deprivation test to measure copeptin to confirm the diagnosis. The investigators hypothesize that basal copeptin levels can reliably differentiate between the 5 groups(central, nephrogenic, psychogenic and partial forms) with a sensitivity and specificity >80%. |
What is being measured
The primary outcome is the main question the study is designed to answer.
Diagnosis of diabetes insipidus(DI) centralis versus psychogenic DI
Measured: 2 years
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted23 Sep 2008 (estimated)
- Study startJun 2008
- Primary completionOct 2014
- Study completionOct 2014
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (6)Papers the sponsor has linked to this study.
- Other trials for Diabetes InsipidusStudies of the same condition, open and under way.
- More trials run by University Hospital, Basel, SwitzerlandThe sponsor's other registered studies.
- 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
- 50 participants (actual)
Sponsor and investigators
- Lead sponsor
- University Hospital, Basel, Switzerland
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- Mirjam Christ-Crain, Prof. Dr. med., Principal investigator, University Hospital, Basel, Switzerland
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00757276
- Sponsor's protocol ID
- EKBB 68/08
- Status last verified
- Dec 2014
- First submitted
- 22 Sep 2008
- Last updated
- 15 Dec 2014
- Results posted
- No
Publications
Atila C, Winzeler B, Chifu I, Fassnacht M, Refardt J, Christ-Crain M. A post-hoc internal validation of arginine-stimulated copeptin cut-offs for diagnosing AVP deficiency (central diabetes insipidus). Pituitary. 2025 Apr 26;28(3):53. doi: 10.1007/s11102-025-01523-2.
PubMed 40281371Ebrahimi F, Urwyler SA, Betz MJ, Christ ER, Schuetz P, Mueller B, Donath MY, Christ-Crain M. Effects of interleukin-1 antagonism and corticosteroids on fibroblast growth factor-21 in patients with metabolic syndrome. Sci Rep. 2021 Apr 12;11(1):7911. doi: 10.1038/s41598-021-87207-w.
PubMed 33846498Bologna K, Cesana-Nigro N, Refardt J, Imber C, Vogt DR, Christ-Crain M, Winzeler B. Effect of Arginine on the Hypothalamic-Pituitary-Adrenal Axis in Individuals With and Without Vasopressin Deficiency. J Clin Endocrinol Metab. 2020 Jul 1;105(7):dgaa157. doi: 10.1210/clinem/dgaa157.
PubMed 32236441Winzeler B, Cesana-Nigro N, Refardt J, Vogt DR, Imber C, Morin B, Popovic M, Steinmetz M, Sailer CO, Szinnai G, Chifu I, Fassnacht M, Christ-Crain M. Arginine-stimulated copeptin measurements in the differential diagnosis of diabetes insipidus: a prospective diagnostic study. Lancet. 2019 Aug 17;394(10198):587-595. doi: 10.1016/S0140-6736(19)31255-3. Epub 2019 Jul 11.
PubMed 31303316Urwyler SA, Timper K, Fenske W, de Mota N, Blanchard A, Kuhn F, Frech N, Arici B, Rutishauser J, Kopp P, Stettler C, Muller B, Katan M, Llorens-Cortes C, Christ-Crain M. Plasma Apelin Concentrations in Patients With Polyuria-Polydipsia Syndrome. J Clin Endocrinol Metab. 2016 May;101(5):1917-23. doi: 10.1210/jc.2016-1158. Epub 2016 Mar 11.
PubMed 26967692Timper K, Fenske W, Kuhn F, Frech N, Arici B, Rutishauser J, Kopp P, Allolio B, Stettler C, Muller B, Katan M, Christ-Crain M. Diagnostic Accuracy of Copeptin in the Differential Diagnosis of the Polyuria-polydipsia Syndrome: A Prospective Multicenter Study. J Clin Endocrinol Metab. 2015 Jun;100(6):2268-74. doi: 10.1210/jc.2014-4507. Epub 2015 Mar 13.
PubMed 25768671
Study at a glance
From the registry record, last updated by the sponsor on 15 Dec 2014. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Copeptin in the Diagnosis and Differential Diagnosis of Diabetes Insipidus. The CoSIP-Study
- ClinicalTrials.gov ID
- NCT00757276
- Acronym / sponsor ID
- EKBB 68/08
- Conditions
- Diabetes Insipidus
- Keywords
- Copeptin, Diabetes insipidus, diagnostic marker, Vasopressin, antidiuretic hormone (ADH)
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 50 participants (actual)
- Lead sponsor
- University Hospital, Basel, SwitzerlandUniversity, hospital or other
- Study start
- Jun 2008
- Primary completion
- Oct 2014 (actual)
- Study completion
- Oct 2014 (actual)
- First posted
- 23 Sep 2008 (estimated)
- 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.
Evaluation of Copeptin in the differential diagnosis of diabetes insipidus.
Detailed description
Background:
Plasma arginine vasopressin (AVP) measurement is recommended for the differential diagnosis of diabetes insipidus and polydipsia. However, AVP measurement is cumbersome. AVP is derived from a larger precursor peptide along with copeptin, which is a more stable peptide directly mirroring the production of AVP. Copeptin can be assayed readily in plasma.
Aim: To evaluate the diagnostic accuracy of copeptin levels in the diagnosis and differential diagnosis of diabetes insipidus.
Design: Prospective, observational multicenter study.
Setting: Department of Endocrinology, University Hospital of Basel
Patients: Patients with suspected or known central (complete or partial), nephrogenic (complete or partial) or psychogenic diabetes insipidus undergoing a standardized water deprivation test.
Intervention: All patients with suspected or known diabetes insipidus will undergo an overnight water deprivation test and a standardized water deprivation test, as routinely performed in the diagnostic evaluation of diabetes insipidus. Plasma AVP and copeptin will be measured at baseline (8 am before start of thirsting), and hourly during the water deprivation test.
Study hypothesis: Copeptin levels will provide a better diagnostic accuracy in the diagnosis and differential diagnosis of diabetes insipidus as compared to AVP measurement.
Analysis: We will study 5 groups of patients: A) Patients with complete central diabetes insipidus, B) Patients with partial central diabetes insipidus, C) Patients with complete nephrogenic diabetes insipidus, D) Patients with partial nephrogenic diabetes insipidus and E) Patients with psychogenic diabetes insipidus. All groups will consist of 10 patients based on the following assumptions: Based on pilot studies we assume that patients in group A) will have copeptin values of 2.5 ± 1.0; Group B) 3.0 ± 1.0, Group C) 15.0 ± 5; Group D) 6 ± 2.0 and Group E) 4.0 ± 1.0 pmol/L. This results in a power of 90% to detect a difference in copeptin levels of 0.8pmol/L between the closest two groups, i.e. patients with partial central Diabetes insipidus and patients with psychogenic Diabetes insipidus.
Significance: The measurement of copeptin will allow a better discrimination of patients with diabetes insipidus, especially for the discrimination of partial central and nephrogenic and psychogenic diabetes insipidus.
Study design
- Observational model
- Cohort
- Time perspective
- Prospective
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| 1 | – | –All patients > 18 years who are tested for the diagnosis of DI because of a history of polyuria (> 40 ml/kg per 24 hours) in the presence of polydipsia Patients with known DI will be contacted whether they agree to participate in the study and to undergo again a water deprivation test to measure copeptin to confirm the diagnosis. The investigators hypothesize that basal copeptin levels can reliably differentiate between the 5 groups(central, nephrogenic, psychogenic and partial forms) with a sensitivity and specificity >80%. |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- All patients >18 years who are tested for the diagnosis of DI because of a history of polyuria (>40ml/kg per 24 hours) in the presence of polydipsia Patients with known DI will be contacted whether they agree to participate in the study and to undergo again a water deprivation test to measure copeptin to confirm the diagnosis.
Key inclusion criteria (1 listed)
- All patients > 18 years who are tested for the diagnosis of DI because of a history of polyuria (> 40 ml/kg per 24 hours) in the presence of polydipsia Patients with known DI will be contacted whether they agree to participate in the study and to undergo again a water deprivation test to measure copeptin to confirm the diagnosis.
Key exclusion criteria (7 listed)
- Polyuria of other origin, i.e. prostate hyperplasia, diabetes mellitus.
- Pregnancy
- The investigators do not perform the water deprivation test in patients with: *renal insufficiency
- No informed consent
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Diagnosis of diabetes insipidus(DI) centralis versus psychogenic DI
Time frame: 2 years
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 15 Dec 2014.
- Derived from this study: PubMed 40281371Atila C, Winzeler B, Chifu I, Fassnacht M, Refardt J, Christ-Crain M. A post-hoc internal validation of arginine-stimulated copeptin cut-offs for diagnosing AVP deficiency (central diabetes insipidus). Pituitary. 2025 Apr 26;28(3):53. doi: 10.1007/s11102-025-01523-2.
- Derived from this study: PubMed 33846498Ebrahimi F, Urwyler SA, Betz MJ, Christ ER, Schuetz P, Mueller B, Donath MY, Christ-Crain M. Effects of interleukin-1 antagonism and corticosteroids on fibroblast growth factor-21 in patients with metabolic syndrome. Sci Rep. 2021 Apr 12;11(1):7911. doi: 10.1038/s41598-021-87207-w.
- Derived from this study: PubMed 32236441Bologna K, Cesana-Nigro N, Refardt J, Imber C, Vogt DR, Christ-Crain M, Winzeler B. Effect of Arginine on the Hypothalamic-Pituitary-Adrenal Axis in Individuals With and Without Vasopressin Deficiency. J Clin Endocrinol Metab. 2020 Jul 1;105(7):dgaa157. doi: 10.1210/clinem/dgaa157.
- Derived from this study: PubMed 31303316Winzeler B, Cesana-Nigro N, Refardt J, Vogt DR, Imber C, Morin B, Popovic M, Steinmetz M, Sailer CO, Szinnai G, Chifu I, Fassnacht M, Christ-Crain M. Arginine-stimulated copeptin measurements in the differential diagnosis of diabetes insipidus: a prospective diagnostic study. Lancet. 2019 Aug 17;394(10198):587-595. doi: 10.1016/S0140-6736(19)31255-3. Epub 2019 Jul 11.
- Derived from this study: PubMed 26967692Urwyler SA, Timper K, Fenske W, de Mota N, Blanchard A, Kuhn F, Frech N, Arici B, Rutishauser J, Kopp P, Stettler C, Muller B, Katan M, Llorens-Cortes C, Christ-Crain M. Plasma Apelin Concentrations in Patients With Polyuria-Polydipsia Syndrome. J Clin Endocrinol Metab. 2016 May;101(5):1917-23. doi: 10.1210/jc.2016-1158. Epub 2016 Mar 11.
- Derived from this study: PubMed 25768671Timper K, Fenske W, Kuhn F, Frech N, Arici B, Rutishauser J, Kopp P, Allolio B, Stettler C, Muller B, Katan M, Christ-Crain M. Diagnostic Accuracy of Copeptin in the Differential Diagnosis of the Polyuria-polydipsia Syndrome: A Prospective Multicenter Study. J Clin Endocrinol Metab. 2015 Jun;100(6):2268-74. doi: 10.1210/jc.2014-4507. Epub 2015 Mar 13.
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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. This study is not recruiting at the moment.
Mirjam Christ-Crain, Prof. Dr. med. principal investigator
University Hospital, Basel, Switzerland
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 Diabetes Insipidus, run by University Hospital, Basel, Switzerland at 1 site in Switzerland.
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 1 inclusion and 7 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: finished, as of the sponsor's last update on 15 Dec 2014. 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 Switzerland. 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?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
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?
Diagnosis of diabetes insipidus(DI) centralis versus psychogenic DI (time frame: 2 years). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT00757276, which also lists 6 linked publications.
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 15 Dec 2014; AzTrials last refreshed its copy on 8 Nov 2026.