Postoperative Anemia After Bariatric Surgery

July 31, 2025 updated by: Yuntao Nie, China-Japan Friendship Hospital
To investigate the real incidence of short and long-term anemia after bariatric surgery, and explore the risk factors.

Study Overview

Status

Recruiting

Conditions

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 Type

Observational

Enrollment (Estimated)

400

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

Study Locations

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

N/A

Sampling Method

Probability Sample

Study Population

Patients without anemia at baseline who will undergo bariatric surgery will be included.

Description

Inclusion Criteria:

  • 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

Exclusion Criteria:

  • Patients who have anemia at baseline

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Incidence of anemia after 1, 3, 5, 10 years
Time Frame: 10 years
Incidence of anemia after 1, 3, 5, 10 years
10 years

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Incidence of anemia-related nutrient deficiencies
Time Frame: 10 years
Incidence of folate, ferritin, vitamin B12, and iron deficiencies
10 years
Hazard ratios for the risk factors of postoperative anemia
Time Frame: 10 years
Hazard ratios for the risk factors of postoperative anemia will be calculated by Cox regression model.
10 years

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

China-Japan Friendship Hospital

Investigators

  • Principal Investigator: Yuntao Nie, M.D., China-Japan Friendship Hospital

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

February 1, 2024

Primary Completion (Estimated)

December 31, 2026

Study Completion (Estimated)

December 31, 2027

Study Registration Dates

First Submitted

December 27, 2023

First Submitted That Met QC Criteria

December 27, 2023

First Posted (Actual)

January 10, 2024

Study Record Updates

Last Update Posted (Actual)

August 3, 2025

Last Update Submitted That Met QC Criteria

July 31, 2025

Last Verified

July 1, 2025

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • CJBariatric005

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

Data should be accessed with the permission of the principal investigator.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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