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Thromboembolic risk after gender-affirming hormone therapy among transmen

Activated Protein C Resistance and Coagulation Profiles among Transmasculine Individuals Receiving Testosterone Therapy

Status
Active, not recruiting
Phases
Unknown
Study type
Observational
Source
TCTR
Registry ID
TCTR20250826006
Enrollment
30
Registered
2025-08-26
Start date
2025-05-26
Completion date
Unknown
Last updated
2026-08-03

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Risk of thrombosis and coagulopathy following initiation of testosterone therapy in transmasculine individuals Transgender men Gender-affirming hormone therapy Testosterone Coagulation Fibrinolysis

Interventions

Transmasculine people, aged 20-45 years, aiming for testosterone treatment
Supportive Care
Transmasculine people

Sponsors

Faculty of Medicine, Chulalongkorn University
Lead Sponsor

Eligibility

Sex/Gender
Female
Age
20 Years to 45 Years

Inclusion criteria

Inclusion criteria: 1. Transgender men who attend follow-up appointments at the Gynecology Clinic and Gender Health Clinic, King Chulalongkorn Memorial Hospital, Thai Red Cross Society 2. Willing to participate in the research study 3. Able to read and write Thai proficiently 4. Transgender men who wish to receive gender-affirming hormone therapy and have never received such hormone therapy prior to participating in the study 5. No history of ovarian surgery in the past

Exclusion criteria

Exclusion criteria: 1. Presence of abnormal liver or kidney function. 2. Current symptoms or history of other psychiatric disorders, including Schizophrenia 3. Spectrum and Other Psychotic Disorders. 4. Use of psychiatric medications or other neurologically active drugs prior to enrollment in the study. 5. History of HIV infection and treatment with antiretroviral drugs. 6. Use of any medications that affect the metabolism of testosterone during the course of gender-affirming hormone therapy. 7. Presence of conditions or use of medications that affect blood coagulation. Any other contraindications to gender-affirming hormone therapy, such as cerebrovascular thrombosis, acute myocardial infarction, or hormone-sensitive cancers.

Design outcomes

Primary

MeasureTime frame
Activated Protein C resistance baseline and at 13 weeks after treatment Activated Protein C resistance

Secondary

MeasureTime frame
Coagulation and fibrinolytic profiles baseline and at 13 weeks after treatment CBC, BUN, Creatinine, AST, ALT, Estradiol, Free androgen index (Total testosterone and SHBG), Lipid profile, PT with INR, PTT, factor II, VIII, IX, XI, fibrinogen, protein C, protein S, antithrombin

Countries

Thailand

Contacts

Public ContactPanachai Nimitpanya

King Chulalongkorn Memorial Hospital

phonepanachai@docchula.com0805779639

Outcome results

None listed

Source: TCTR (via WHO ICTRP) · Data processed: Aug 10, 2026