Experience MedEx Seamless Care Delivery — 10% OFF on Your First Appointment - Use 'TRYMEDEX' Coupon Code on Checkout //////////////////////////////////// General Price List — Consultation: 750 THB | Home Lab Test Service Fee: 750 THB (FREE for Orders Over 5,000 THB)
MedEx is a one-stop destination when it comes to medical tourism and digital specialized health care services. MedEx serves as a connector between patients and trusted world-class health service providers.
Hormone testing guide · 2026
An estradiol number without a cycle day attached to it cannot be interpreted. That single detail explains most confusing E2 results.
Estradiol (E2) is the principal oestrogen in people of reproductive age, produced mainly by developing ovarian follicles. Its concentration changes dramatically across the menstrual cycle — low in the early follicular phase, peaking just before ovulation, and rising again in the luteal phase — so a result is only interpretable if the cycle day is recorded. It is drawn on day 2 to 4 with FSH for baseline assessment, used to monitor ovarian stimulation, and measured in men where gynaecomastia or aromatase inhibitor use is being considered.
| Cycle timing | Day 2–4 with FSH for baseline; the cycle day must be recorded |
|---|---|
| Assay note | Sensitive assays or LC-MS/MS preferred for men and postmenopausal women |
| Sample | Single blood draw, no fasting required |
| Affected by | Hormonal contraception, HRT, ovarian stimulation, pregnancy |
| Collection | At home in Bangkok or at 20+ MedEx sites nationwide; nurse-at-home draw available |
| Price | Listed on the MedEx lab test catalogue — same price nationwide |
| Early follicular (day 2–4) | Lowest point. This is the baseline used alongside FSH. |
|---|---|
| Late follicular | Rises steeply as the dominant follicle matures, peaking shortly before the LH surge. |
| Ovulation | Sharp fall immediately after the surge. |
| Mid-luteal | Secondary rise from the corpus luteum, alongside progesterone. |
Because of this pattern, the same absolute value can be entirely normal or clearly abnormal depending on the day it was taken. Always note the cycle day on the request form when booking through the MedEx lab test catalogue.
The main reason a day-3 estradiol is ordered is to validate the day-3 FSH sitting next to it. An early estradiol rise suppresses FSH and can make a declining ovarian reserve look normal.
So the pattern that matters is not either number alone but the combination: a normal FSH with a raised early-follicular estradiol should not be read as reassuring. This is one of the more common misreadings in fertility bloods and is easily avoided by ordering the pair.
Where ovarian reserve is the question, most clinicians now lead with AMH, which does not need cycle timing, and add day-3 FSH and estradiol for the fuller picture.
Book a day 2-4 draw with FSH and estradiol together.
Estradiol falls to consistently low levels after menopause. However, like FSH, it fluctuates too much through perimenopause to be a reliable diagnostic test, and in women over 45 with typical symptoms menopause is diagnosed clinically rather than biochemically.
Where estradiol is genuinely useful is monitoring. In women using transdermal or implanted oestrogen where symptoms are not controlled, or where absorption is in question, a serum estradiol can guide dose adjustment. Oral oestrogen is less straightforward to monitor this way. Testing is not routinely required for most people on standard HRT with good symptom control.
Anyone weighing up menopause treatment options benefits more from a structured specialist teleconsultation than from repeated hormone panels.
Men produce estradiol by aromatising testosterone, mostly in adipose tissue. It has genuine physiological roles in bone density, libido and sperm production, so lower is not automatically better.
Testing is reasonable when investigating gynaecomastia, when assessing infertility, in men with obesity where aromatisation is increased, or when monitoring testosterone therapy where oestrogen-related side effects appear. Standard immunoassays are unreliable at male concentrations, so a sensitive assay or mass spectrometry method should be requested.
Aromatase inhibitors are sometimes taken without supervision to suppress oestrogen during testosterone use. Driving estradiol too low carries real consequences for bone and sexual function. This is worth discussing with a clinician rather than self-managing.
For baseline assessment, day 2 to 4 of the cycle alongside FSH. Because estradiol changes dramatically across the cycle, the cycle day must be recorded for the result to mean anything.
Not reliably. Estradiol fluctuates too much during perimenopause, and in women over 45 with typical symptoms menopause is a clinical diagnosis. Estradiol is more useful for monitoring oestrogen therapy than for diagnosis.
No, fasting is not required for estradiol itself.
To investigate gynaecomastia, assess infertility, or manage oestrogen-related side effects during testosterone therapy. A sensitive assay or mass spectrometry method should be used, since standard immunoassays are unreliable at male concentrations.
Not routinely for most people with good symptom control. It can help when transdermal or implanted oestrogen is not controlling symptoms, or where absorption is in doubt.
Menopause symptoms are usually better assessed clinically than biochemically.
Medical disclaimer: This article is general health information and does not replace medical advice, diagnosis or treatment. Laboratory reference ranges differ between laboratories and results must be interpreted alongside your symptoms, medicines and medical history. Speak with a qualified clinician before starting, stopping or changing any treatment. Service details, inclusions and prices can change — confirm them with MedEx before booking.
Why NIPT starts at 10 weeks, how gestational age affects fetal fraction, and how to plan timing around the dating scan and confirmatory options.
Why Ureaplasma parvum, U. urealyticum and Mycoplasma hominis are usually normal flora, what a positive result means and when treatment is justified.
How luteinising hormone is used to time ovulation, what the LH to FSH ratio means in PCOS, and how blood LH differs from urine ovulation kits.
Find quality services, specialists, procedures and more from the comfort of your home. All you need to do is enter a keyword or phrase describing what you are looking for.
DOWNLOAD MEDEX ONE APP
MedEx is a one-stop digital care navigation concierge backed by physical infrastructure, owning the patient experience and decentralizing the care continuum across Asia—integrating provider aggregation, satellite clinics, telemedicine, and at-home care.
MedEx is a one-stop digital care navigation concierge backed by physical infrastructure, owning the patient experience and decentralizing the care continuum across Asia—integrating provider aggregation, satellite clinics, telemedicine, and at-home care.
© 2020-26 MedEx Ventures Co., Ltd.
