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Swiss ProspectivE Cohort of TRAnsgender and Gender Diverse Individuals - The SPECTRA Study

Swiss Prospective Cohort of TRAnsgender and Gender Diverse Individuals - The SPECTRA Study

Status
Recruiting
Phases
Unknown
Study type
Observational
Source
ClinicalTrials.gov
Registry ID
NCT06774053
Acronym
SPECTRA
Enrollment
600
Registered
2025-01-14
Start date
2026-04-20
Completion date
2046-01-01
Last updated
2026-06-30

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

Conditions

Gender Incongruence, Transgender Individuals

Keywords

Gender Affirming Hormone Therapy (GAHT), Gender Affirming Surgery (GAS), Transgender and Gender Diverse (TGD)

Brief summary

The goal of this observational study is to understand the factors influencing the well-being and health of transgender and gender-diverse (TGD) individuals undergoing gender-affirming therapies in Switzerland. The study population includes TGD individuals aged 16 and older, at various stages of their medical transition, including those who have discontinued or detransitioned. The main question is: What are the key factors influencing the well-being and health outcomes of transgender and gender-diverse individuals undergoing gender-affirming therapies? Researchers will compare health outcomes across different subgroups, such as those at different stages of transition or detransition, to examine the effects of gender-affirming therapies. Participants will: Complete electronic questionnaires assessing gender congruence, quality of life, mental health, and other outcomes. Provide biological samples (e.g., blood, urine, stool, and skin swabs) for laboratory analysis. Undergo clinical evaluations related to endocrinology, fertility, dermatology, and urology as part of their routine follow-up.

Interventions

OTHERGroup A (start of GAHT)

The study program consists of assessments at baseline (before the start of GAHT) and subsequent follow-up visits scheduled at routine intervals which are typically every three months for the first year, every six months for the second year and every twelve months thereafter. Participants' data collection includes a mix of digital and in-person methods. Demographical information, clinical and laboratory parameters such as hormone levels which are part of standard clinical care

OTHERGroup B (on-going GAHT)

The study program consists of a yearly assessment as part of the long-term routine follow-up. Participants' data collection includes a mix of digital and in-person methods. Demographical information, clinical and laboratory parameters such as hormone levels which are part of standard clinical care

OTHERGroup C (GAS)

If GAS is administered, additional assessments are performed preoperatively, and postoperatively in analogy with routine clinical visits, e.g. one week after surgery and then three, six and twelve months later (then once yearly) (e.g. type of surgery, outcome, patient' satisfaction). If participants undergo gender-affirming genital surgery, a genital swab and urine analysis (from the urine sample taken for routine testing) will additionally be performed for microbiome analyses as part of the study assessment.

Sponsors

University Hospital, Basel, Switzerland
Lead SponsorOTHER
University Hospital, Zürich
CollaboratorOTHER
Cantonal Hospital Lucerne, Switzerland
CollaboratorUNKNOWN

Study design

Observational model
COHORT
Time perspective
PROSPECTIVE

Eligibility

Sex/Gender
ALL
Age
16 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Age 16 years and above. * Established diagnosis of gender incongruence * Indication for gender affirming therapy or ongoing or discontinued gender affirming therapy

Exclusion criteria

* Unable to give informed consent * Missing commitment or ability to study protocol adherence

Design outcomes

Primary

MeasureTime frameDescription
Gender Congruence as Assessed by Gender Congruence and Life Satisfaction Scale (GCLS)Baseline; 3, 6, 9, 12, 18, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, 156, 168, 180, 192, 204, 216, 228, and 240 monthsThe Gender Congruence and Life Satisfaction Scale (GCLS) is a validated outcome measure specifically developed for transgender individuals to assess distress and unhappiness with experienced gender and body, regardless of gender assigned at birth or gender identity. The scale ranges from \[insert range, e.g., 0-100\], with higher scores indicating greater gender congruence and life satisfaction, and lower scores reflecting greater distress and unhappiness. It is suitable for binary and nonbinary individuals seeking gender-affirming care.

Countries

Switzerland

Contacts

CONTACTBettina Winzeler, PD Dr.
bettina.winzeler@usb.ch+41 61 556 50 75
CONTACTHüseyin Cihan, Dr.
hueseyin.cihan@usb.ch
PRINCIPAL_INVESTIGATORBettina Winzeler, PD Dr.

University Hospital Basel, Department of Endocrinology

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Jul 1, 2026