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Hormones

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Hormone Tests: Understand Timing, Preparation & Results

Use this hub to understand common hormone tests, when timing can matter, what specimen is typically collected, how related hormones fit together, and where self-pay prices differ across major providers.

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Quick take

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Understand a hormone testLearn what a hormone measures, the specimen commonly used, and how it fits with related endocrine testing.Read hormone guides →Compare hormone pricesSearch mapped self-pay prices for testosterone, estradiol, cortisol, fertility testing, and more.Compare prices →Plan the timingReview time-of-day, menstrual-cycle, fasting, medication, and specimen considerations before collection.Check timing factors →Explore men’s healthSee testosterone, PSA, estradiol, SHBG, fertility, metabolic, and related testing.Men’s health hub →Explore women’s healthSee reproductive hormones, fertility, pregnancy, thyroid, iron, and wellness testing.Women’s health hub →
Before you test

Four factors that can matter with hormone testing

1Time of daySome hormones, including cortisol and testosterone, can vary during the day. Collection timing may be specified.
2Cycle timingEstradiol, progesterone, LH, FSH, and related reproductive hormones can change across the menstrual cycle.
3Medications & supplementsHormone therapy, corticosteroids, biotin, and other products can affect selected results or assays.
4Method & reference rangeAssay method, age, sex, reproductive stage, and laboratory-specific intervals can affect interpretation.
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Latest Hormones guides

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Compare Hormones test prices

Open the dedicated CTX Stat comparison tool to search mapped self-pay prices across major direct-to-consumer laboratory providers.

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Common questions

Hormones FAQs

What blood tests are commonly used to evaluate hormones?

Common tests include testosterone, estradiol, progesterone, LH, FSH, prolactin, SHBG, DHEA-S, cortisol, and thyroid-related hormones depending on the clinical question.

Does timing matter for hormone testing?

It can. Some hormones vary by time of day, menstrual-cycle phase, medication use, or other physiologic factors. Follow the preparation and timing instructions for the specific test.

Why are total and free testosterone different?

Total testosterone includes protein-bound and unbound hormone in circulation, while free testosterone estimates or measures the smaller unbound fraction. The appropriate test depends on the clinical question and laboratory method.

Can medications or supplements affect hormone test results?

Yes. Prescription hormones, corticosteroids, biotin, supplements, and other medications can affect selected assays or hormone levels. Follow the ordering clinician or laboratory instructions and do not stop prescribed medication without medical guidance.

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