HRT Blood Tests UK (2026): What to Test, When, and Whether You Even Need To

The short version

• You don't need a blood test to start HRT in the UK if you're over 45 with typical symptoms — NICE says so explicitly.
• Routine monitoring on standard HRT isn't recommended. Symptom control is the guide. Testing is for specific clinical reasons, not "to keep an eye on things".
• Test oestradiol if symptoms persist on a standard dose, you suspect non-absorption, or you're on doses above the licensed maximum.
• Testosterone monitoring is different — if you're prescribed testosterone, baseline + 3-month + 6-month + annual checks are recommended.
• Use venous sampling for oestradiol on patches or gels. Finger-prick is contamination-prone and can give wildly high readings.
• A useful baseline before starting HRT: thyroid (TSH + FT4 + antibodies) + vitamin D + ferritin. £80–£150 privately. Catches the conditions that mimic menopause.
• Private oestradiol: £39–£59. Full HRT monitoring panel: £89–£169.

What NICE actually says about HRT and blood tests

NICE guideline NG23 (menopause: diagnosis and management) is the single source of truth for UK clinical practice. The relevant statements:

• Diagnosis in women over 45 is clinical, based on symptoms. Do not use FSH to diagnose perimenopause or menopause in this group.
• FSH testing has a role in women aged 40–45 with menopausal symptoms (including atypical ones), in women under 40 where premature ovarian insufficiency is suspected, and in women on combined oestrogen and progestogen contraception where the clinical picture is unclear.
• Routine monitoring of oestradiol levels on standard HRT is not recommended. Treatment is titrated to symptom control.
• For testosterone (off-licence for HSDD), baseline and follow-up monitoring is recommended to keep levels in the female physiological range.

The British Menopause Society endorses the same framework. What this means in practice: a UK GP or private menopause clinic should not require blood tests before prescribing HRT for typical menopausal symptoms after 45. If they're insisting on FSH "to confirm menopause", they're not following NICE.

The four situations where HRT blood testing is genuinely useful

1. Persistent symptoms despite a standard licensed dose

You've been on a standard dose for at least 3 months — for example two pumps of Oestrogel daily or a 50 mcg patch twice weekly — and symptoms are still active. Before doubling up, it's worth checking the serum oestradiol level.

Three possibilities will show:

• Low level (under 150 pmol/L): suggests poor absorption. Patch site rotation, gel application technique, or a brand switch (Sandrena/Lenzetto vs Oestrogel vs Estradot vs Evorel) may fix it before dose escalation.
• Adequate level (250–500 pmol/L) with symptoms: the symptoms may not be oestrogen-deficiency symptoms. Worth investigating thyroid, low ferritin, sleep apnoea, or considering testosterone if libido and energy are the main issues.
• High level (over 600 pmol/L) with symptoms: unusual — may indicate non-menopausal causes of the symptoms, or sensitivity to progestogen (try a different progestogen form).

2. Suspected non-absorption

Patches not sticking. Gel not drying. Brand changes. Skin conditions affecting absorption. A serum oestradiol level taken at the right time post-application gives an objective answer faster than a 12-week trial of changing things.

3. Doses above standard licensed maximums

Some women need (and tolerate) doses above the standard maximum — for example more than two pumps of Oestrogel, or above a 100 mcg patch. Above-licence dosing should be monitored. Most UK menopause specialists test serum oestradiol every 6–12 months in this group to confirm the level is therapeutic but not excessive, and to document clinical rationale.

4. Testosterone monitoring

Testosterone is prescribed off-licence in the UK for hypoactive sexual desire disorder (HSDD) and sometimes for energy and mood when oestrogen alone isn't enough. The most common products are AndroFeme cream (imported via private prescription) and small doses of Testogel/Tostran (split from the standard male dose).

Because supraphysiological testosterone causes side effects (acne, hair growth, mood changes, voice changes), monitoring is recommended:

• Baseline total testosterone (and SHBG) before starting.
• 3 months after starting.
• 6 months after starting.
• Annually thereafter once stable.

The target is total testosterone within the female reference range, typically 0.5–1.7 nmol/L on UK lab assays. Free androgen index (FAI) is sometimes calculated using testosterone and SHBG together for additional context.

What a sensible baseline panel before HRT looks like

You don't need bloods to start HRT, but a baseline that catches the conditions that mimic menopausal symptoms is reasonable and high-value. The three conditions that most commonly look like perimenopause:

Thyroid function (TSH + FT4, ideally + FT3 + thyroid antibodies)

Hypothyroidism causes fatigue, low mood, weight gain, brain fog, hair thinning, irregular cycles. Sound familiar? Most NHS GPs will run TSH; FT4 and antibodies are less routinely added. A full thyroid panel privately costs £45–£75.

Vitamin D (25-hydroxyvitamin D)

UK vitamin D deficiency is common — particularly in midlife women with limited sun exposure. Low vitamin D causes fatigue, muscle aches, low mood. The NHS does not routinely test it. £25–£50 privately.

Ferritin (iron stores)

Heavy or irregular bleeding in perimenopause depletes iron stores long before haemoglobin drops. Low ferritin causes fatigue, hair shedding, restless legs, exercise intolerance. Often missed because the NHS FBC looks normal. £30–£50 privately.

Bundled, the three together cost £80–£150 from Medichecks, Randox, Forth or Thriva. This is the panel I'd recommend more often than reproductive hormone testing in a perimenopausal woman over 45.

Why finger-prick oestradiol on patches and gels is unreliable

This is one of the most under-discussed pitfalls in private HRT monitoring.

Transdermal oestradiol — patches, gels, sprays — works by being absorbed through the skin. Residue remains on the application site and on hands that handled it. Hand-washing reduces but doesn't eliminate it. When a finger-prick lancet pierces skin with any residue present, even microscopic amounts of high-concentration oestradiol can enter the blood drop and produce a wildly elevated reading.

Documented cases in the UK menopause community show finger-prick oestradiol results of 2,000–10,000+ pmol/L in women whose same-day venous samples were in the normal therapeutic range. The implication: a finger-prick "your oestradiol is very high" result on transdermal therapy is almost certainly an artefact.

Practical rules:

• Use venous blood draws for oestradiol if you're on transdermal therapy. Most UK private labs offer a venous clinic option or in-home phlebotomy for an extra £25–£40.
• If you must finger-prick, take the sample from the hand and arm furthest from any application site (so if you apply gel to thighs and arms, only ever finger-prick from the hand of the arm with no application).
• Allow at least 24 hours since the last application before a finger-prick.
• Wash hands thoroughly with soap immediately before the lancet, dry, and don't touch the application site between washing and sampling.

Oral oestradiol (Premarin, Elleste Solo, etc.) doesn't have this issue, but oral oestradiol is much less commonly used in modern UK HRT practice because of the higher VTE risk vs transdermal.

Timing your blood test

Timing matters and depends on the formulation:

Whatever you test, sample on a typical day, not after a missed dose or a recent change. Levels stabilise over 6–12 weeks on any new dose or brand.

What different HRT panels actually include

Baseline pre-HRT health panel (£80–£150)

TSH + FT4 + thyroid antibodies + vitamin D + ferritin. Catches the conditions that mimic menopause. This is what I'd order if you're starting HRT and want sensible baseline data.

HRT monitoring panel (£89–£169)

Serum oestradiol + FSH + LH + total testosterone + SHBG + TSH + FT4. Useful when there's a clinical reason to test, particularly persistent symptoms or testosterone monitoring.

Comprehensive menopause panel (£129–£229)

HRT monitoring panel + full thyroid (FT3, antibodies) + vitamin D + ferritin + sometimes HbA1c and lipids. Closer to a full midlife metabolic check than a pure HRT check.

What I'd avoid

Panels that include progesterone testing in a non-cycling woman on continuous combined HRT or on a Mirena — serum progesterone tells you almost nothing useful in that context. Panels with cortisol single-point readings sold as "stress" tests — single-point serum cortisol has limited clinical use without context. Panels heavy on "free hormones" calculations that are derived rather than measured — these add cost but rarely change management.

Cost comparison: UK private HRT testing 2026

Prices are typical 2026 list prices and shift with seasonal promotions. Always check the latest from the provider before paying.

What HRT blood tests don't tell you

• Whether your dose is "right" — only symptoms tell you that. Numbers help when symptoms are unclear or inconsistent with dose.
• Whether you should be on HRT — that's a clinical decision based on symptoms, risks and preferences, not a blood result.
• Whether you're "in menopause" — over 45, this is a clinical diagnosis. FSH is a snapshot and varies cycle to cycle in perimenopause.
• Long-term safety — blood tests don't predict VTE, breast cancer or stroke risk. Risk assessment is separate.
• Whether the brand or form is best for you — a comparative trial of brands with symptom and side effect tracking is more informative than serum levels.

When to escalate beyond standard testing

Some women — particularly those with persistent symptoms on high doses, women using compounded body-identical hormones outside standard formulations, or women with complex medical histories — benefit from specialist menopause clinic input rather than self-directed private blood testing. Both NHS menopause clinics (limited capacity, GP referral) and private specialist clinics (London Menopause Clinic, Newson Health, Marion Gluck Clinic and others) offer this. Self-directed monitoring is most useful when there's a clear question to answer — "is my dose absorbing?" — and least useful as a "general health check" on HRT.

Honest summary

If you're over 45, have typical menopausal symptoms, and want to start HRT — you don't need a blood test. NICE doesn't recommend one. If your GP insists on FSH "to confirm menopause", they're not following the guideline.

If you want sensible baseline data before starting HRT, the highest-value panel is thyroid + vitamin D + ferritin for around £80–£150 privately. This catches the conditions that mimic menopause better than reproductive hormone testing does.

If you're already on HRT and symptoms are well-controlled, you don't need routine bloods. Test if there's a specific question: persistent symptoms despite a standard dose, suspected non-absorption, above-licence dosing, or testosterone monitoring. Use venous, not finger-prick, for oestradiol on transdermal therapy.

Most private menopause panels are sold as "essential HRT checks" but for most women on standard licensed HRT they don't change management. Spend the £100–£200 on the things that genuinely matter for your case, not on monitoring that gives you a number without a decision.