AnemiaNCT06198790
Postoperative Anemia After Bariatric Surgery
An observational study of Anemia and Bariatric Surgery Candidate, run by China-Japan Friendship Hospital at 1 site in China.
Trial summary
To investigate the real incidence of short and long-term anemia after bariatric surgery, and explore the risk factors. Read more about this study
- Who is it for?
- Ages 16 to 70 years
- Conditions the study is for
- Anemia, Bariatric Surgery Candidate
- How many people
- 400 participants
- Where
- 1 siteChina
- Study dates
- 1 Feb 2024to 31 Dec 2027
- How long will I take part?
- 10 Years
- 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 16 to 70 years
- All sexes
- Child, Adult, Older adult
Study population: Patients without anemia at baseline who will undergo bariatric surgery will be included.
Who may be able to join
- Patients who will undergo sleeve gastrectomy or Roux-en-Y gastric bypass
- Aged between 16 and 70 years
- Patients who is not diagnosed as anemia at baseline
Who cannot join
- Patients who have anemia at baseline
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
China1 site, 1 recruiting
- Recruiting
Yuntao Nie
Beijing, 100029
Yuntao Nie, M.D., +8618611835860, nytnyt1231@163.com
Hua Meng, M.D., +8618611457779, menghuade@hotmail.com
About this study
To investigate the real incidence of short and long-term anemia after bariatric surgery, and explore the risk factors.
Read the detailed description
This study aims to investigate the real incidence of short and long-term anemia after bariatric surgery and explore the risk factors.
- Conditions
- Anemia, Bariatric Surgery Candidate
- Medical subject headings
- Anemia
What is being measured
The primary outcome is the main question the study is designed to answer.
Incidence of anemia after 1, 3, 5, 10 years
Incidence of anemia after 1, 3, 5, 10 years
Measured: 10 years
Secondary outcomes (2)
Incidence of anemia-related nutrient deficiencies
Incidence of folate, ferritin, vitamin B12, and iron deficiencies
Measured: 10 years
Hazard ratios for the risk factors of postoperative anemia
Hazard ratios for the risk factors of postoperative anemia will be calculated by Cox regression model.
Measured: 10 years
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted10 Jan 2024
- Study start1 Feb 2024
- Primary completion31 Dec 2026 (estimated)
- Study completion31 Dec 2027 (estimated)
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
- Prospective
- Enrolment
- 400 participants (estimated)
- Target duration
- 10 Years
Sponsor and investigators
- Lead sponsor
- China-Japan Friendship Hospital
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Yuntao Nie, China-Japan Friendship Hospital
- Investigators
- Yuntao Nie, M.D., Principal investigator, China-Japan Friendship Hospital
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06198790
- Sponsor's protocol ID
- CJBariatric005
- Status last verified
- Jul 2025
- First submitted
- 27 Dec 2023
- Last updated
- 3 Aug 2025
- Results posted
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No: Data should be accessed with the permission of the principal investigator.
Study at a glance
From the registry record, last updated by the sponsor on 3 Aug 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Postoperative Anemia After Bariatric Surgery
- ClinicalTrials.gov ID
- NCT06198790
- Acronym / sponsor ID
- CJBariatric005
- Conditions
- Anemia, Bariatric Surgery Candidate
- Study type
- Observational
- Recruitment status
- Recruiting
- Enrolment
- 400 participants (estimated)
- Lead sponsor
- China-Japan Friendship HospitalUniversity, hospital or other
- Study start
- 1 Feb 2024 (actual)
- Primary completion
- 31 Dec 2026 (estimated)
- Study completion
- 31 Dec 2027 (estimated)
- First posted
- 10 Jan 2024 (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 investigate the real incidence of short and long-term anemia after bariatric surgery, and explore the risk factors.
Detailed description
This study aims to investigate the real incidence of short and long-term anemia after bariatric surgery and explore the risk factors.
Study design
- Observational model
- Cohort
- Time perspective
- Prospective
- Target follow-up
- 10 Years
Who may qualify
- Ages
- 16 to 70 years
- Sex
- All
- Age groups
- Child, Adult, Older adult
- Study population
- Patients without anemia at baseline who will undergo bariatric surgery will be included.
Key inclusion criteria (3 listed)
- Patients who will undergo sleeve gastrectomy or Roux-en-Y gastric bypass
- Aged between 16 and 70 years
- Patients who is not diagnosed as anemia at baseline
Key exclusion criteria (1 listed)
- Patients who have anemia at baseline
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
Incidence of anemia after 1, 3, 5, 10 years
Time frame: 10 years
Incidence of anemia after 1, 3, 5, 10 years
2 secondary outcomes
Incidence of anemia-related nutrient deficiencies
Time frame: 10 years
Hazard ratios for the risk factors of postoperative anemia
Time frame: 10 years
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 3 Aug 2025.
- Individual participant dataSharing planned: No. Data should be accessed with the permission of the principal investigator.
Related trials for Anemia
Enrolling by invitationObservational study
Screening for Hematology Branch Protocols
Hematologic Disease and Disorders, Donors
RecruitingObservational study
Cancer in Inherited Bone Marrow Failure Syndromes
Diamond Blackfan Anemia, Dyskeratosis Congenita
RecruitingPhase 2
Allogeneic Hematopoietic Stem Cell Transplantation for Severe Aplastic Anemia and Other Bone Marrow Failure Syndromes Using G-CSF Mobilized CD34+ Selected Hematopoietic Precursor Cells Co-Infused With a Reduced Dose of Non-Mobilized Donor T-cells
Severe Aplastic Anemia, MDS (Myelodysplastic Syndrome)
RecruitingObservational study
Natural History of Acquired and Inherited Bone Marrow Failure Syndromes
Severe Aplastic Anemia, Telomere Biology Disorders
Active, not recruitingObservational study
Investigating the Mechanistic Effects of Mitapivat in Subjects With Sickle Cell Disease
Sickle Cell Anemia, Sickle Cell Thalassemia
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.
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 Candidate, 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 1 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: looking for participants now, as of the sponsor's last update on 3 Aug 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?
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?
Contact Yuntao Nie, M.D. (+8618611835860, nytnyt1231@163.com), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Incidence of anemia after 1, 3, 5, 10 years (time frame: 10 years). 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 3 Aug 2025; AzTrials last refreshed its copy on 30 Oct 2026.