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Throw this in there too!

Bhasins camp is going to be dropping a big one soon!

Critical points here!

* The data from the present analyses suggest that the interaction of the three sex hormones with their cognate binding proteins is highly complex and dynamic and influenced by their relative circulating concentrations. Therefore, models of testosterones binding to SHBG, based on the assumption of fixed apparent binding affinity of sex hormones with SHBG, that do not consider the influence of estradiol and dihydrotestosterone on the free testosterone fraction are unlikely to provide accurate estimates of free testosterone fraction.

* Because of these complex interactions between various sex hormones as well as other ligands with sex hormone binding globulin, direct measurements of free testosterone using a reliable assay, such as the equilibrium dialysis method, may be a superior marker of testosterone’s treatment effect.

[EMBED content="thread-30832"]https://www.excelmale.com/threads/modulation-of-circulating-free-testosterone-fraction-by-t-dht-and-estradiol-during-trt.30832/[/EMBED]

* Collectively, these data highlight the non-linear, concentration-dependent modulation of testosterone repartitioning into bound and free fractions by each of the three sex hormones.

*Our finding that the estradiol, DHT, and testosterone interact to alter free testosterone fraction non-linearly suggests that in men with hypogonadism who are receiving TRT, free testosterone levels should be measured using a reliable method to guide the dose titration. The models that do not consider changes in estradiol and DHT concentrations are susceptible to error in estimating free testosterone concentrations.

*These data suggest that changes in estradiol and dihydrotestosterone concentrations should be considered in evaluating response to testosterone treatment because of their differential influence on free testosterone concentrations in addition to their ability to exert other independent biologic effects. Because of these complex interactions between various sex hormones as well as other ligands with sex hormone binding globulin, direct measurements of free testosterone using a reliable assay, such as the equilibrium dialysis method, may be a superior marker of testosterone’s treatment effect.

<blockquote data-quote="madman" data-source="post: 297605" data-attributes="member: 13851">Throw this in there too!Bhasins camp is going to be dropping a big one soon!Critical points here!* The data from the present analyses suggest that the interaction of the three sex hormones with their cognate binding proteins is highly complex and dynamic and influenced by their relative circulating concentrations. Therefore, models of testosterones binding to SHBG, based on the assumption of fixed apparent binding affinity of sex hormones with SHBG, that do not consider the influence of estradiol and dihydrotestosterone on the free testosterone fraction are unlikely to provide accurate estimates of free testosterone fraction.* Because of these complex interactions between various sex hormones as well as other ligands with sex hormone binding globulin, direct measurements of free testosterone using a reliable assay, such as the equilibrium dialysis method, may be a superior marker of testosterone’s treatment effect.[EMBED content=&quot;thread-30832&quot;]https://www.excelmale.com/threads/modulation-of-circulating-free-testosterone-fraction-by-t-dht-and-estradiol-during-trt.30832/[/EMBED]* Collectively, these data highlight the non-linear, concentration-dependent modulation of testosterone repartitioning into bound and free fractions by each of the three sex hormones.*Our finding that the estradiol, DHT, and testosterone interact to alter free testosterone fraction non-linearly suggests that in men with hypogonadism who are receiving TRT, free testosterone levels should be measured using a reliable method to guide the dose titration. The models that do not consider changes in estradiol and DHT concentrations are susceptible to error in estimating free testosterone concentrations.*These data suggest that changes in estradiol and dihydrotestosterone concentrations should be considered in evaluating response to testosterone treatment because of their differential influence on free testosterone concentrations in addition to their ability to exert other independent biologic effects. Because of these complex interactions between various sex hormones as well as other ligands with sex hormone binding globulin, direct measurements of free testosterone using a reliable assay, such as the equilibrium dialysis method, may be a superior marker of testosterone’s treatment effect.</blockquote>

[QUOTE="madman, post: 297605, member: 13851"] Throw this in there too! Bhasins camp is going to be dropping a big one soon! Critical points here! [I][B]* The data from the present analyses suggest that the interaction of the three sex hormones with their cognate binding proteins is [U]highly complex and dynamic and influenced by their relative circulating concentrations[/U]. Therefore, models of testosterones binding to SHBG, based on the [U]assumption of fixed apparent binding affinity of sex hormones with SHBG, that do not consider the influence of estradiol and dihydrotestosterone on the free testosterone fraction are unlikely to provide accurate estimates of free testosterone fraction[/U]. * [I][B][B][I]Because of these [U]complex interactions[/U] between various sex hormones as well as other ligands with [U]sex hormone binding globulin, direct measurements of free testosterone using a reliable assay, such as the equilibrium dialysis method, may be a superior marker of testosterone’s treatment effect[/U].[/I][/B][/B][/I][/B][/I] [EMBED content="thread-30832"]https://www.excelmale.com/threads/modulation-of-circulating-free-testosterone-fraction-by-t-dht-and-estradiol-during-trt.30832/[/EMBED] [B]*[/B][I][B] Collectively, these data highlight the [U]non-linear, concentration-dependent modulation of testosterone repartitioning into bound and free fractions by each of the three sex hormones[/U]. *Our finding that the [U]estradiol, DHT, and testosterone interact to alter free testosterone fraction non-linearly[/U] suggests that in men with hypogonadism who are receiving TRT, [U]free testosterone levels should be measured using a reliable method to guide the dose titration[/U]. [U]The models that do not consider changes in estradiol and DHT concentrations are susceptible to error in estimating free testosterone concentrations[/U]. *[B][I]These data suggest that [U]changes in estradiol and dihydrotestosterone concentrations should be considered in evaluating response to testosterone treatment because of their differential influence on free testosterone concentrations in addition to their ability to exert other independent biologic effects[/U]. Because of these [U]complex interactions[/U] between various sex hormones as well as other ligands with [U]sex hormone binding globulin, direct measurements of free testosterone using a reliable assay, such as the equilibrium dialysis method, may be a superior marker of testosterone’s treatment effect[/U].[/I][/B][/B][/I] [/QUOTE]

Verification

TRT Hormone Predictor Widget

Understanding Your Hormones

Estradiol (E2)

A form of estrogen produced from testosterone. Important for bone health, mood, and libido. Too high can cause side effects; too low can affect well-being.

DHT

Dihydrotestosterone is a potent androgen derived from testosterone. Affects hair growth, prostate health, and masculinization effects.

Free Testosterone

The biologically active form of testosterone not bound to proteins. Directly available for cellular uptake and biological effects.

Scientific Reference

Lakshman KM, Kaplan B, Travison TG, Basaria S, Knapp PE, Singh AB, LaValley MP, Mazer NA, Bhasin S. The effects of injected testosterone dose and age on the conversion of testosterone to estradiol and dihydrotestosterone in young and older men. J Clin Endocrinol Metab. 2010 Aug;95(8):3955-64.

DOI: 10.1210/jc.2010-0102 | PMID: 20534765 | PMCID: PMC2913038