AnemiaNCT06170749

Prediction Model for Anemia After Bariatric Surgery

An observational study of Anemia and Bariatric Surgery, run by China-Japan Friendship Hospital at 1 site in China.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Trial summary

To develop and validate a prediction model for estimating the short and long-term risk of anemia after bariatric surgery. Read more about this study

Who is it for?: Ages 16 to 70 years
Conditions the study is for: Anemia, Bariatric Surgery
How many people: 600 participants
Where: 1 siteChina
Study dates: 1 Sep 2017to 31 May 2025
How long will I take part?: 5 Years
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 16 to 70 years
All sexes
Child, Adult, Older adult

Study population: This study aims to include patients with obesity who will undergo bariatric surgery.

Who may be able to join

aged between 16-70 years;
body mass index (BMI) ≥ 27.5 kg/m2;
complete preoperative and follow-up data.

Who cannot join

vegetarian;
other bariatric procedures;
renal failure at baseline;
postoperative bleeding (it was defined as a drop in hemoglobin levels > 3 g/dL or a confirmed blood loss requiring treatment after surgery);
incomplete preoperative and follow-up data.

Trial locations and contacts

1 site in 1 country.

China1 site

Yuntao Nie
Beijing, 100029

Other trials in China

About this study

To develop and validate a prediction model for estimating the short and long-term risk of anemia after bariatric surgery.

Read the detailed description

This study aims to develop and validate a prediction model for estimating the probability of anemia for patients with obesity one, three, and five years after sleeve gastrectomy and Roux-en-Y gastric bypass, using preoperative clinical and laboratory data.

Conditions: Anemia, Bariatric Surgery
Keywords: Anemia, Bariatric surgery, Prediction model
Medical subject headings: Anemia

What is being measured

The primary outcome is the main question the study is designed to answer.

AUCs of the prediction model at 1, 3, 5 years
This metric shows the discrimination ability of the prediction model.
Measured: 5 years

Secondary outcomes (1)

Brier score
This metric shows the calibration of the model. The Brier score (on a scale ranging from 0 to 1), which calculates the difference between the estimated and observed risk for malignancy with values closer to 0 indicating better calibration, was used to evaluate model calibration.
Measured: 5 years

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

1 Sep 201731 May 2025

First posted14 Dec 2023
Study start1 Sep 2017
Primary completion31 Dec 2024
Study completion31 May 2025

Resources

Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
Other trials for AnemiaStudies 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: Other
Enrolment: 600 participants (actual)
Target duration: 5 Years

IDs, dates and publications

ClinicalTrials.gov ID: NCT06170749
Sponsor's protocol ID: CJBariatric003
Status last verified: Jul 2025
First submitted: 6 Dec 2023
Last updated: 8 Jul 2025
Results posted: No
FDA-regulated drug: No
FDA-regulated device: No
Individual data sharing: Undecided: Due to the medical privacy implications of the study data, the principal investigator needs to be contacted for access.

Want to know more?

The sponsor has not listed a contact. The official record may have more details.

Talk to your doctor first and take this page with you. Only the study team can confirm whether you can join.

Questions to ask the study team

What is the study trying to find out?
What would I need to do, and how often would I visit?
Could I receive a placebo instead of the treatment?
What are the possible risks and benefits for me?
Will it cost me anything? Are travel or time paid for?
Can I keep seeing my own doctor during the study?
What happens when the study ends?

See locations

RecruitingPhase 2
Study to Assess the Safety and Tolerability of Tafasitamab in Adult Participants With Primary Autoimmune Blood Cell Disorders
Immune Thrombocytopenia
RecruitingObservational study
A Long-term Follow-up Study of Patients With ARD103 CAR-T Cell Therapies
Acute Myeloid Leukemia, in Relapse, Acute Myeloid Leukemia, in Relapsed or Refractory
Active, not recruitingPhase 3
A Study Evaluating the Efficacy, Safety, Pharmacokinetics and Pharmacodynamics of Crovalimab in Adult and Adolescent Participants With Atypical Hemolytic Uremic Syndrome (aHUS)
Atypical Hemolytic Uremic Syndrome
RecruitingPhase 1/2
Pacritinib, a Kinase Inhibitor of CSF1R, IRAK1, JAK2, and FLT3, in Adults and Pediatric Participants 12 Years of Age or Older With Myelodysplastic Syndromes or Myelodysplastic/Myeloproliferative Neoplasms
Myelodysplastic Syndromes
Not yet recruitingObservational study
Clinical Genetics Branch Eligibility Screening Survey
Melanoma, Li-Fraumeni Syndrome

All Anemia trials

Study at a glance

From the registry record, last updated by the sponsor on 8 Jul 2025. Recruitment status is as the sponsor reported it: confirm with the study team.

Official title: Prediction Model for Anemia After Bariatric Surgery
ClinicalTrials.gov ID: NCT06170749
Acronym / sponsor ID: CJBariatric003
Conditions: Anemia, Bariatric Surgery
Keywords: Anemia, Bariatric surgery, Prediction model
Study type: Observational
Recruitment status: Completed
Enrolment: 600 participants (actual)
Lead sponsor: China-Japan Friendship HospitalUniversity, hospital or other
Collaborators: The Third Xiangya Hospital of Central South University, Jining First People's Hospital, The Second Hospital of Shandong University
Study start: 1 Sep 2017 (actual)
Primary completion: 31 Dec 2024 (actual)
Study completion: 31 May 2025 (actual)
First posted: 14 Dec 2023 (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.

To develop and validate a prediction model for estimating the short and long-term risk of anemia after bariatric surgery.

Detailed description

Study design

Observational model: Cohort
Time perspective: Other
Target follow-up: 5 Years

Who may qualify

Ages: 16 to 70 years
Sex: All
Age groups: Child, Adult, Older adult
Study population: This study aims to include patients with obesity who will undergo bariatric surgery.

Key inclusion criteria (3 listed)

aged between 16-70 years;
body mass index (BMI) ≥ 27.5 kg/m2;
complete preoperative and follow-up data.

Key exclusion criteria (5 listed)

vegetarian;
other bariatric procedures;
renal failure at baseline;
postoperative bleeding (it was defined as a drop in hemoglobin levels > 3 g/dL or a confirmed blood loss requiring treatment after surgery);
incomplete preoperative and follow-up data.

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

AUCs of the prediction model at 1, 3, 5 years
Time frame: 5 years
This metric shows the discrimination ability of the prediction model.

1 secondary outcome

Brier score
Time frame: 5 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 8 Jul 2025.
Individual participant dataSharing planned: Undecided. Due to the medical privacy implications of the study data, the principal investigator needs to be contacted for access.

Related trials for Anemia

RecruitingPhase 2
Study to Assess the Safety and Tolerability of Tafasitamab in Adult Participants With Primary Autoimmune Blood Cell Disorders
Immune Thrombocytopenia
RecruitingObservational study
A Long-term Follow-up Study of Patients With ARD103 CAR-T Cell Therapies
Acute Myeloid Leukemia, in Relapse, Acute Myeloid Leukemia, in Relapsed or Refractory
Active, not recruitingPhase 3
A Study Evaluating the Efficacy, Safety, Pharmacokinetics and Pharmacodynamics of Crovalimab in Adult and Adolescent Participants With Atypical Hemolytic Uremic Syndrome (aHUS)
Atypical Hemolytic Uremic Syndrome
RecruitingPhase 1/2
Pacritinib, a Kinase Inhibitor of CSF1R, IRAK1, JAK2, and FLT3, in Adults and Pediatric Participants 12 Years of Age or Older With Myelodysplastic Syndromes or Myelodysplastic/Myeloproliferative Neoplasms
Myelodysplastic Syndromes
Not yet recruitingObservational study
Clinical Genetics Branch Eligibility Screening Survey
Melanoma, Li-Fraumeni Syndrome

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.

Yuntao Nie, M.D. principal investigator

China-Japan Friendship Hospital

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 Anemia and Bariatric Surgery, run by China-Japan Friendship Hospital at 1 site in China.

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 5 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 8 Jul 2025. 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 China. 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?

AUCs of the prediction model at 1, 3, 5 years (time frame: 5 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 NCT06170749.

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 8 Jul 2025.