Preferences for Rectal Sexually Transmitted Infection Sample Collection and Sexual Behaviors Among Adolescent and Young Adult Women Accessing Primary Care Services.

BACKGROUND: High prevalence of asymptomatic rectal chlamydia and gonorrhea among women is increasingly recognized. Screening is controversial because of lack of natural history data. Barriers to screening may include reluctance to discuss anal sex and collect rectal samples. This study describes the prevalence of sexual contact exposing adolescent and young adult women to extragenital sexually transmitted infections and acceptability of self-collection and clinician collection of rectal samples, preference for self- versus clinician-collected rectal samples, and preference for home or doctor's office for sample collection. METHODS: Participants were recruited from a primary care office and completed structured interviews assessing types of sexual contact and attitudes about rectal sampling. Differences were tested using χ2 and 2-sided Fisher exact test. RESULTS: Of 110 cisgender women (aged 14-22 years) enrolled, the average age was 18.4 years (SD, 1.7 years), 83% reported a history of extragenital contact, 22% reported history of receptive anal intercourse. A majority of participants reported self- and clinician-collected rectal samples to be acceptable (86% and 73%, respectively), with preferences for self-collection (71%) over clinician collection (29%, P < 0.001) and collection at the doctor's office (85%) over home (15%, P < 0.001). CONCLUSIONS: Adolescent and young adult (AYA) women engage in behaviors that increase the risk of rectal sexually transmitted infection (STI). Self- and clinician-collected rectal samples were acceptable. A majority of AYA women preferred to collect rectal samples in the doctor's office rather than at home. This may reduce adolescents' access to direct-to-consumer STI services. Offering in-clinic, self-collected rectal samples may improve uptake of rectal STI screening in adolescent girls.

Changes in Bone Marrow Adipose Tissue in Transgender and Gender Non-Conforming Youth Undergoing Pubertal Suppression: A Pilot Study.

Pubertal suppression with gonadotropin-releasing hormone (GnRH) agonists in transgender and gender non-conforming (TGNC) youth may affect acquisition of peak bone mass. Bone marrow adipose tissue (BMAT) has an inverse relationship with bone mineral density (BMD). To evaluate the effect of pubertal suppression on BMAT, in this pilot study we prospectively studied TGNC youth undergoing pubertal suppression and cisgender control participants with similar pubertal status over a 12-month period. BMD was measured by dual-energy X-ray absorptiometry and peripheral quantitative computed tomography. Magnetic Resonance T1 relaxometry (T1-R) and spectroscopy (MRS) were performed to quantify BMAT at the distal femur. We compared the change in BMD, T1-R values, and MRS lipid indices between the two groups. Six TGNC (two assigned female and four assigned male at birth) and three female control participants (mean age 10.9 and 11.7 years, respectively) were enrolled. The mean lumbar spine BMD Z-score declined by 0.29 in the TGNC group, but increased by 0.48 in controls (between-group difference 0.77, 95% CI: 0.05, 1.45). Similar findings were observed with the change in trabecular volumetric BMD at the 3% tibia site (-4.1% in TGNC, +3.2% in controls, between-group difference 7.3%, 95% CI: 0.5%-14%). Distal femur T1 values declined (indicative of increased BMAT) by 7.9% in the TGNC group, but increased by 2.1% in controls (between-group difference 10%, 95% CI: -12.7%, 32.6%). Marrow lipid fraction by MRS increased by 8.4% in the TGNC group, but declined by 0.1% in controls (between-group difference 8.5%, 95% CI: -50.2%, 33.0%). In conclusion, we observed lower bone mass acquisition and greater increases in BMAT indices by MRI and MRS in TGNC youth after 12 months of GnRH agonists compared with control participants. Early changes in BMAT may underlie an alteration in bone mass acquisition with pubertal suppression, including alterations in mesenchymal stem cells within marrow.

Hormonal contraceptive choices in a clinic-based series of transgender adolescents and young adults.

Aims: To describe the use of hormonal contraceptives for menstrual management and/or pregnancy prevention in a clinic-based series of transgender adolescents and young adults who were assigned female at birth (transmasculine identity). Methods: We performed a chart review of post-menarchal transgender assigned-female-at-birth (AFAB) patients, age 10-25 years, seen at CCHMC Transgender Health Clinic for at least 2 visits between July 1, 2013 and September 17, 2016, and who were not on a puberty suppression method. We collected data including choice of hormonal contraceptive and indication (menstrual suppression, pregnancy prevention, or both), duration of use, initiation of sexual activity, reported sexual partners, and use of gender-affirming hormone therapy (i.e., testosterone). We present simple descriptive statistics. Results: A total of 231 patients met inclusion criteria, with ages from 11 to 25 years. Of those, 135 (59%) were using a hormonal contraceptive method. Most patients (67%) used hormonal contraception for the indication of menstrual suppression. Most commonly used method was depot medroxyprogesterone (DMPA) (49 patients), followed by combined oral contraceptives (COC) and norethindrone (progestin-only pill, POP) (34 patients each). Thirteen patients used 52 mg levonorgestrel IUD (LNG-IUD). Of the total sample (n = 231), 82 (36%) reported sexual activity, 35 of whom (43% of sexually active patients) reported sexual intercourse with assigned-male-at-birth (AMAB) partners and/or penile-vaginal intercourse. Among 35 patients at risk for pregnancy, only 21 (60%) were using hormonal contraception. Over half (54%) of sexually active patients taking testosterone discontinued their hormonal contraceptive method once they stopped having menses. Discussion: Within a sample of transgender AFAB adolescents, half of whom were taking testosterone, a variety of contraceptives were used, including depot medroxyprogesterone, combined oral contraceptives, and levonorgestrel IUD. Among those taking testosterone, many patients discontinued contraception once they stopped having menses.

Documenting an epidemic of suffering: low health-related quality of life among transgender youth.

PURPOSE: To quantify HRQOL of TGN patients using the PedsQL 4.0 generic core scales, and to compare reported HRQOL of TGN adolescents with published data from comparison populations. METHODS: Transgender children and adolescents (N = 142; 68% natal females) ages 6-23 years (M = 15.9, SD = 3.7) attending an outpatient clinic for TGN care at an academic pediatric hospital and caregivers of children and adolescents (N = 95) completed the PedsQL 4.0 generic core scales. Scores were compared with published scores for healthy adolescents and adolescents with 10 chronic diseases. RESULTS: TGN youth reported significantly lower overall HRQOL (more than twice the clinically meaningful difference) compared to youth without chronic disease. Total self-reported TGN HRQOL (M(SD), 65.72(17.40)) was lower than all chronic disease comparison groups except for rheumatology and cerebral palsy. TGN youth reported physical functioning (M(SD), 75.33(22.87)) lower than or similar to chronically ill comparisons, but higher than rheumatology and cerebral palsy groups. Psychosocial functioning (M(SD), 59.87(17.83)) was lower than all comparison samples and similar to youth with cerebral palsy. Results were similar for parent proxy-reports of TGN youth HRQOL (LS means: 68.75; 95% CI 65.87-71.61 vs 66.16; 95% CI 62.87-69.45; p = 0.12). CONCLUSIONS: TGN youth reported low HRQOL across all domains; most were significantly lower than healthy peers or peers with chronic diseases. Clinicians should understand the magnitude of TGN youth's low HRQOL and offer them and their caregivers resources to maximize their ability to achieve their full potential for healthy and productive lives.

Eating disorder symptoms among transgender and gender diverse youth.

Compared to cisgender peers, transgender and gender diverse (TGD) youth and adults report elevated eating disorder (ED) symptoms likely related to gender dysphoria and attempts to modify their bodies accordingly. Less is known about the impact on gender-affirming care and ED symptoms. This study aimed to expand on extant research and describe ED symptoms in TGD youth seeking gender-affirming care while exploring potential associations between gender-affirming hormone use and ED symptoms. A total of 251 TGD youth completed the Eating Disorders Examination-Questionnaire (EDE-Q) as part of routine clinical care. ANCOVAs and negative binomial regressions examined differences in ED symptoms among transgender females (identifying as female but assigned male at birth) and transgender males (identifying as male but assigned female at birth). ED severity was not significantly different among transgender females versus transgender males, (p = .09), or associated with gender-affirming hormone use (p = .07). Transgender females receiving gender-affirming hormones reported a greater proportion of objective binge eating episodes compared to those who were not (p = .03). Over a quarter of TGD youth reported engagement in ED behaviors suggesting assessment and intervention related to ED behaviors among TGD youth is imperative since adolescence is a particularly vulnerable period for adolescents and engagement in ED behaviors could lead to full ED development and medical risk.

Estimating Transgender and Gender-Diverse Youth Populations in Health Systems and Survey Data.

OBJECTIVES: To identify and examine demographic variation in estimates of gender-diverse youth (GDY) populations from the PEDSnet learning health system network and the Youth Risk Behavior Survey (YRBS). METHODS: The PEDSnet sample included 14- to 17-years-old patients who had ≥2 encounters at a member institution before March 2022, with at least 1 encounter in the previous 18 months. The YRBS sample included pooled data from 14- to 17-year-old in-school youth from the 2017, 2019, and 2021 survey years. Adjusted logistic regression models tested for associations between demographic characteristics and gender dysphoria (GD) diagnosis (PEDSnet) or self-reported transgender identity (YRBS). RESULTS: The PEDSnet sample included 392 348 patients and the YRBS sample included 270 177 youth. A total of 3453 (0.9%) patients in PEDSnet had a GD diagnosis and 5262 (1.9%) youth in YRBS self-identified as transgender. In PEDSnet, adjusted logistic regression indicated significantly lower likelihood of GD diagnosis among patients whose electronic medical record-reported sex was male and among patients who identified as Asian, Black/African American, and Hispanic/Latino/a/x/e. In contrast, in the YRBS sample, only youth whose sex was male had a lower likelihood of transgender identity. CONCLUSIONS: GDY are underrepresented in health system data, particularly those whose electronic medical record-reported sex is male, and Asian, Black/African American, and Hispanic/Latino/a/x/e youth. Collecting more accurate gender identity information in health systems and surveys may help better understand the health-related needs and experiences of GDY and support the development of targeted interventions to promote more equitable care provision.

Providers' Perspectives on Decision-Making About Care for Transgender Youth.

Background: Transgender and gender-diverse (TGD) youth face health care decisions that are complicated by both social and medical aspects of gender care. Little is known about how providers support decision-making in this context or the gaps they perceive in decision support. Objective: To explore health care providers' perspectives on the decision-making processes in youth gender care. Methods: We interviewed health care providers (n=17) caring for TGD youth and asked about the nature of families' decision-making, providers' role in this process, and potential improvements to existing support systems. Two independent coders coded all responses which were analyzed using thematic analysis. Results: From providers' perspectives, they serve as "guides" to families through a challenging decision-making process. Youth arrive educated and eager to begin treatment, but caregivers are more hesitant. Providers lack data to address parents' concerns, and struggle to support families through interpersonal conflict. All providers recognized a need to improve decision support for families. Conclusions: Providers described decision-making in this context as a multistep process where interpersonal conflict and limited data slow progress. Practice Implications: There is ample opportunity to leverage insights from adult and pediatric medical decision-making research to improve decision support for providers, TGD youth, and families.

Decision Support Needs for Transgender and Gender-Diverse Youth and Families: A Patient-Centered Needs Assessment.

PURPOSE: Due to the intertwining of medical and social decision-making, new approaches to shared decision-making are likely needed for supporting decisions related to the care of transgender and gender-diverse (TGD) adolescents. Prior to developing decision support interventions for TGD youth, a decision support needs assessment must be completed. METHODS: Self-identified TGD youth, family members of TGD youth, clinicians caring for this population, and community advocates participated in one of six group level assessments (GLAs). GLA is a structured, participatory qualitative method that engages diverse groups of stakeholders in generating and evaluating ideas on the topic of interest. Upon completion of all GLAs, a survey was developed and distributed to GLA participants inviting them to rank ideas generated during the GLAs. RESULTS: Six major themes emerged from the GLAs regarding decision support needs, including: improving healthcare provider skills and education, increasing access to support outside the healthcare system, strengthening community and societal support, developing special information resources, supporting youth in leading decision-making about transition, and modifying the healthcare system. In the follow-up survey, improving healthcare provider skills and education was the most commonly chosen top priority. DISCUSSION: Participants identified decision support needs for TGD youth and their families that were mostly distinct from traditional decision support approaches. Participants' focus on the need to improve healthcare provider skills and education provides an opportunity to couple gender-focused education with shared decision-making skills, an approach that may be more sustainable than tools for specific decisions.

Supporting Gender-Related Medical Decision Making for Transgender and Gender-Diverse Individuals: A Scoping Review.

Purpose: Transgender and gender-diverse (TGD) individuals and their families face numerous challenging decisions. To better understand their decision processes, we conducted a scoping review of the existing literature and of decision-support tools in use at pediatric gender-care clinics. Methods: We searched PubMed, EMBASE, Scopus CINAHL, PsychINFO, and EBM Reviews for studies that were original research focused on decisions, decision making, or decision support for TGD individuals and/or their families. All studies were reviewed for inclusion by at least two researchers. Additionally, we reviewed clinical tools used to support decision making by TGD youth and their families. Results: We retrieved 3306 articles. Thirty-two met criteria for data extraction. Studies focused on three major decisions: gender-confirming surgery, fertility preservation, and gender-affirming hormone therapy. Several themes that cut across clinical topics emerged: decision-making processes, decision-making roles, and sources of decision support. Only three articles focused on decision-support interventions, two of which discussed development of support tools and one evaluated a class designed to help with surgical decision making. None of the clinical tools reviewed met criteria for a decision aid. Conclusions: There is a dearth of studies related to decision support interventions, an absence validated by the resources currently in clinical use. This scoping review suggests an opportunity for the development of tools to aid in the decision-making processes for TGD youth and their families.

Co-occurring Autism Spectrum Disorder and Gender Dysphoria in Adolescents.

BACKGROUND AND OBJECTIVES: Autism spectrum disorder (ASD) and gender dysphoria (GD) frequently cooccur. However, existing research has primarily used smaller samples, limiting generalizability and the ability to assess further demographic variation. The purpose of this study was to (1) examine the prevalence of cooccurring ASD and GD diagnoses among US adolescents aged 9 to 18 and (2) identify demographic differences in the prevalence of cooccurring ASD and GD diagnoses. METHODS: This secondary analysis used data from the PEDSnet learning health system network of 8 pediatric hospital institutions. Analyses included descriptive statistics and adjusted mixed logistic regression testing for associations between ASD and GD diagnoses and interactions between ASD diagnosis and demographic characteristics in the association with GD diagnosis. RESULTS: Among 919 898 patients, GD diagnosis was more prevalent among youth with an ASD diagnosis compared with youth without an ASD diagnosis (1.1% vs 0.6%), and adjusted regression revealed significantly greater odds of GD diagnosis among youth with an ASD diagnosis (adjusted odds ratio = 3.00, 95% confidence interval: 2.72-3.31). Cooccurring ASD/GD diagnoses were more prevalent among youth whose electronic medical record-reported sex was female and those using private insurance, and less prevalent among youth of color, particularly Black and Asian youth. CONCLUSIONS: Results indicate that youth whose electronic medical record-reported sex was female and those using private insurance are more likely, and youth of color are less likely, to have cooccurring ASD/GD diagnoses. This represents an important step toward building services and supports that reduce disparities in access to care and improve outcomes for youth with cooccurring ASD/GD and their families.

Mental Health of Youth With Autism Spectrum Disorder and Gender Dysphoria.

BACKGROUND AND OBJECTIVES: Youth with either autism spectrum disorder (ASD) or gender dysphoria (GD) alone have also been shown to be at greater risk for mental health (MH) concerns; however, very little research has considered how cooccurring ASD and GD may exacerbate MH concerns. The purpose of this study was to examine associations between ASD, GD, and MH diagnoses (anxiety, depression, eating disorder, suicidality, and self-harm) among US adolescent populations. METHODS: This is a secondary analysis of a large administrative dataset formed by 8 pediatric health system members of the PEDSnet learning health system network. Analyses included descriptive statistics and adjusted mixed logistic regression models testing for associations between combinations of ASD and GD diagnoses and MH diagnoses as recorded in the patient's electronic medical record. RESULTS: Based on data from 919 898 patients aged 9 to 18 years, adjusted mixed logistic regression indicated significantly greater odds of each MH diagnosis among those with ASD alone, GD alone, and cooccurring ASD/GD diagnoses compared with those with neither diagnosis. Youth with cooccurring ASD/GD were at significantly greater risk of also having anxiety (average predicted probability, 0.75; 95% confidence interval, 0.68-0.81) or depression diagnoses (average predicted probability, 0.33; 95% confidence interval, 0.24-0.43) compared with youth with ASD alone, GD alone, or neither diagnosis. CONCLUSIONS: Youth with cooccurring ASD/GD are more likely to also be diagnosed with MH concerns, particularly anxiety and depression. This study highlights the need to implement developmentally appropriate, gender-affirming MH services and interventions for youth with cooccurring ASD/GD.

Thrombosis Risk in Transgender Adolescents Receiving Gender-Affirming Hormone Therapy.

BACKGROUND AND OBJECTIVES: Many transgender youth experience gender dysphoria, a risk factor for suicide. Gender-affirming hormone therapy (GAHT) ameliorates this risk but may increase the risk for thrombosis, as seen from studies in adults. The aim with this study was to examine thrombosis and thrombosis risk factors among an exclusively adolescent and young adult transgender population. METHODS: This retrospective chart review was conducted at a pediatric hospital-associated transgender health clinic. The primary outcome was incidence of arterial or venous thrombosis during GAHT. Secondary measures included the prevalence of thrombosis risk factors. RESULTS: Among 611 participants, 28.8% were transgender women and 68.1% were transgender men. Median age was 17 years at GAHT initiation. Median follow-up time was 554 and 577 days for estrogen and testosterone users, respectively. Individuals starting GAHT had estradiol and testosterone levels titrated to physiologic normal. Multiple thrombotic risk factors were noted among the cohort, including obesity, tobacco use, and personal and family history of thrombosis. Seventeen youth with risk factors for thrombosis were referred for hematologic evaluation. Five individuals were treated with anticoagulation during GAHT: 2 with a previous thrombosis and 3 for thromboprophylaxis. No participant developed thrombosis while on GAHT. CONCLUSIONS: In this study, we examined thrombosis and thrombosis risk factors in an exclusively adolescent and young adult population of transgender people receiving GAHT. These data suggest that GAHT in youth, titrated within physiologic range, does not carry a significant risk of thrombosis in the short-term, even with the presence of preexisting thrombosis risk factors.

The relationship of the UPPS model of impulsivity on bulimic symptoms and non-suicidal self-injury in transgender youth.

OBJECTIVE: This brief report examined the relationship of negative urgency (the tendency to act rashly in response to negative emotional states), (lack of) perseverance, (lack of) premeditation, and sensation seeking in association with non-suicidal self-injury (NSSI) and symptoms of bulimia nervosa (BN) in a sample of treatment-seeking transgender (TG) youth. METHOD: Eighty-six TG youth with a mean age of 17 (sd = 3.2) agreed to participate in the study. The majority of our sample identified as TG male (n = 60) with 20 participants identifying as TG female and 6 identifying as non-binary. The racial ethnic breakdown of our sample was 8.2% Black, 8.2% Multi-racial, 1.2% Native American, and 82.4% White. Over » of our sample endorsed at least one episode of objective binge eating in the last 28 days and 62% endorsed a history of NSSI. RESULTS: Negative urgency was significantly associated with the odds of NSSI, objective binge eating, and general eating disorder symptoms. Lack of premeditation was significantly related to the odds of NSSI only. No other factors were significantly associated with NSSI or symptoms of BN. CONCLUSIONS: Negative urgency appears to be an important personality construct in understanding increased risk for NSSI and BN symptoms in transgender youth.

Supporting and Caring for Transgender and Gender-Expansive Individuals in the Dental Practice.

Transgender and gender nonconforming youth are rapidly gaining visibility and acceptance. Nevertheless, this group still experiences a variety of health disparities and is often at high risk for negative health outcomes. To improve cultural competence and provide the best possible care to this vulnerable population, health care professionals, including dentists, need to have a broader understanding of their issues. The purposes of this paper are to (1) summarize the prevalence, etiology, treatment, and common health risks associated with a transgender or gender nonconforming identity; and (2) discuss strategies to create a safe and welcoming environment for this population in the dental practice. (J Dent Child 2019;86(3):173-9).

"I Couldn't See a Downside": Decision-Making About Gender-Affirming Hormone Therapy.

PURPOSE: The aim of the article was to understand adolescents' and parents' decision-making process related to gender-affirming hormone therapy (GAHT). METHODS: We conducted qualitative semistructured interviews with transgender adolescents who began testosterone for GAHT in the prior year and the parents of such adolescents. Questions focused on decision-making roles, steps in the decision process, and factors considered in the decision. Participants used pie charts to describe the division of responsibility for the decision. All interviews were coded by at least two members of the research team with disagreements resolved through discussion. Thematic analysis was used to analyze the data. RESULTS: Seventeen adolescents and 13 parents were interviewed (12 dyads). The process of deciding about GAHT involves a series of small conversations, typically with the adolescent advocating to start treatment and the parent feeling hesitant. In most cases, after seeking information from the Internet, healthcare providers and personal contacts move toward acceptance and agree to start treatment. Although adolescents have some short-term concerns, such as about needles, parents' concerns relate more to long-term risks. Ultimately, for both parents and adolescents, the benefits of treatment outweigh any concerns, and they are in agreement about the goals of personal confidence, comfort in one's body and happiness. CONCLUSIONS: To the extent that the decision about GAHT is a medical decision, the decision process is similar to others. However, decisions about GAHT are much more about gender identity than medical risks, suggesting that interventions based in a medical framework may not aid in supporting decision-making.

Suicidality, Self-Harm, and Body Dissatisfaction in Transgender Adolescents and Emerging Adults with Gender Dysphoria.

Prevalence of suicide attempts, self-injurious behaviors, and associated psychosocial factors were examined in a clinical sample of transgender (TG) adolescents and emerging adults (n = 96). Twenty-seven (30.3%) TG youth reported a history of at least one suicide attempt and 40 (41.8%) reported a history of self-injurious behaviors. There was a higher frequency of suicide attempts in TG youth with a desire for weight change, and more female-to-male youth reported a history of suicide attempts and self-harm behaviors than male-to-female youth. Findings indicate that this population is at a high risk for psychiatric comorbidities and life-threatening behaviors.

Health Concerns of Transgender and Gender Nonconforming Youth and Their Parents Upon Presentation to a Transgender Clinic.

PURPOSE: The purpose of the study was to determine the frequency of specific health concerns identified by transgender and gender nonconforming patients and their parents at initial clinic visit. METHODS: Checklists were developed in an iterative process and distributed to both patients and parents at their initial visit to a transgender clinic. Retrospective chart review and secondary data analyses were performed to determine the number of items endorsed, frequency with which each item was endorsed, and provider domain of each item endorsed: physician, social work, or both physician and social work. RESULTS: Checklists were collected from 118 patients and 103 parents. Patients endorsed a mean of 8.4 concerns (range 0-22) and parents 7.9 concerns (range 0-20). The most commonly endorsed patient concerns included use of gender-affirming hormones, steps for transition, gender-affirming surgery, restroom/dressing room use, and legal issues. Common parent concerns included general resources, child safety at school, acute mental health concerns, restroom/dressing room use, and steps for transition. Of the concerns endorsed by patients, 44% were in the social work domain, 37% in the physician domain, and 19% in both the social work and physician domain. Of the concerns endorsed by parents, 40% were in the social work domain, 31% in the physician domain, and 29% in the social work and physician domain. CONCLUSIONS: Although patients and parents had similar numbers of concerns, they primarily focused on different topics. Youth were more interested in hormones and transition, while parents were more interested with transition and acceptance. Many concerns for both patients and parents fell within the social work domain.

Cross-Sex Hormones and Metabolic Parameters in Adolescents With Gender Dysphoria.

BACKGROUND AND OBJECTIVES: The Endocrine Society states that adolescents with gender dysphoria may start cross-sex hormones. The goal of this study was to identify patterns in metabolic parameters in transgender adolescents receiving cross-sex hormones. METHODS: Data from adolescents aged 14 to 25 years seen in 1 of 4 clinical sites between 2008 and 2014 were retrospectively analyzed. Subjects were divided into affirmed male (female-to-male) patients taking testosterone and affirmed female (male-to-female) patients taking estrogen. Previously recorded measurements of blood pressure, BMI, testosterone, estradiol, prolactin, lipids, electrolytes, liver function tests, hemoglobin/hematocrit, and hemoglobin A1c were reviewed. These values were obtained from before the start of therapy, at 1 to 3 months after initiation, at 4 to 6 months, and at 6 months and beyond. Repeated measures analysis of variance models were used to evaluate changes over time. RESULTS: One hunderd and sixteen adolescents were included (72 female-to-male subjects and 44 male-to-female subjects). Of the 72 subjects taking testosterone, a significant increase in hemoglobin/hematocrit levels and BMI, as well as a decrease in high-density lipoprotein level, was recorded at each visit. No significant changes in any other parameter tested were found. Of the 44 subjects taking estrogen, no statistically significant changes were noted in the measured metabolic parameters. CONCLUSIONS: Testosterone use was associated with increased hemoglobin and hematocrit, increased BMI, and lowered high-density lipoprotein levels; estrogen was associated with lower testosterone and alanine aminotransferase levels. Otherwise, cross-sex hormone administration in adolescents was not associated with significant differences in the selected metabolic parameters over time.