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Does gender-affirming hormone therapy affect markers of kidney health?

Gender-affirming hormone therapy modifies body composition and lean muscle mass in transgender persons. A recent analysis published in the Clinical Journal of the American Society of Nephrology examined the effects of masculinizing and feminizing gender-affirming hormone therapy on markers of kidney function.

For the analysis, a team led by David Collister, MD, Ph.D. (University of Alberta) searched the medical literature and identified 26 relevant studies. At 12 months after initiating gender-affirming hormone therapy, blood levels of creatinine (a marker of kidney function) increased by 0.15 mg/dL in transgender men and decreased by -0.05 mg/dL in transgender women. (An increase in creatinine may indicate possible kidney dysfunction or simply reflect a change in underlying lean muscle mass.) No study reported the impact of gender-affirming hormone therapy on other markers or measures of kidney function (e.g. albumin or protein in the urine, cystatin C, directly measured kidney function), indicating the need for additional research.

“It is important to understand how gender-affirming hormone therapy impacts kidney physiology and how it changes values of common laboratory tests so that patients are properly assessed and not mislabeled with health or disease with regards to kidney function,” said Dr. Collister.

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