However, people who are menstruating may need to get a blood test during a certain time in their menstrual cycle (period). You don’t have to fast (not drink or eat) before getting this blood test. Gonads in females are ovaries and in males, they’re testicles. They help your sex glands (gonads) mature and function. Gonadotropins are essential to your reproductive health. Everyone makes gonadotropin-releasing hormone (GnRH).
Data for gender-affirming care represents the number of adolescents actively receiving these medications (orange). For uterine fibroids, endometriosis, and central precocious puberty (CPP), the bars represent the number of people currently living with the conditions (blue). Comparison of population eligibility and active use of GnRH medications (per 100,000). GnRH medications are given as an injection every one to three months for gynecological conditions or targeted injections in an IVF cycle (Swayzer & Gerriets 2023, Yang et al. 2021).
Testosterone is a hormone that your gonads (sex organs) mainly produce. Testosterone levels are naturally much higher in males. If you or your child is experiencing symptoms related to sexual development and/or fertility, talk to your healthcare provider. Follicle-stimulating hormone (FSH) is an important hormone that has a powerful effect on sexual development and fertility. They may run some simple blood tests to see if there’s an issue with their FSH levels.
The issue starts in the hypothalamus. We will also cover how your genes affect the medications used to treat this condition. The condition is significantly more common in males, though women are frequently misdiagnosed or diagnosed later due to milder symptoms. Kallmann syndrome affects 1 in 8,000 males and 1 in 40,000 females worldwide, yet most people wait years for answers.
A key area for production of GnRH is the preoptic area of the hypothalamus, which contains most of the GnRH-secreting neurons. At the pituitary, GnRH stimulates the synthesis and secretion of follicle-stimulating hormone (FSH) and luteinizing hormone (LH). GnRH is a tropic peptide hormone synthesized and released from GnRH neurons within the hypothalamus. A blood test can measure levels of follicle-stimulating hormone and luteinizing hormone.
GnRH is vital to your sexual maturity, sex drive and fertility.
These examples suggest that GnRH is a socially regulated hormone.citation needed The GnRH neurons are regulated by many different afferent neurons, using several different transmitters (including norepinephrine, GABA, glutamate). GnRH is considered a neurohormone, a hormone produced in a specific neural cell and released at its neural terminal. GnRH secretion is pulsatile in all vertebrates, and is necessary for correct reproductive function. In males, GnRH is secreted in pulses at a constant frequency; however, in females, the frequency of the pulses varies during the menstrual cycle, and there is a large surge of GnRH just before ovulation.
GnRH medications manage reproductive and gynecological problems (Verified Market Reports 2025, Yang et al. 2021). For cancer treatment, these medications are given as long-acting injections (Swayzer & Gerriets 2023). GnRH medications pause these changes to allow for bone growth to attain final adult height align psychosocial development with physical changes (Sharma & Daley 2025, Mendle et al. 2007, Lahlou et al. 2000). The most established use for GnRH medication is treating central precocious puberty (CPP) where puberty begins before 8 in girls and 9 in boys (Sharma & Daley 2025, Lahlou et al. 2000).
Cortisol is the hormone that most directly opposes testosterone production, and chronic cortisol elevation is the most common hormonal imbalance in modern men. It’s natural for testosterone levels to vary depending on your age and overall health. This is called androgen insensitivity syndrome (AIS) and occurs when someone is genetically male but is insensitive to androgens (male sex hormones). Late-onset male hypogonadism happens when the decline in testosterone levels is linked to general aging and/or age-related conditions, particularly obesity and Type 2 diabetes. It’s unlikely — and difficult to tell — that a male adult has higher-than-normal levels of testosterone. Your body controls the levels of testosterone in your blood. However, the majority of testosterone produced in the ovaries is converted to the primary female sex hormone, estradiol.

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