Luteinising Hormone
This test measures luteinising hormone in the blood. It helps assess ovulation, fertility and reproductive hormone signalling.
Turnaround time
1 day
Biomarkers count
1
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Details about Luteinising Hormone
What is the Luteinising Hormone Test?
The Luteinising Hormone (LH) test measures the level of LH in the blood, a hormone produced by the pituitary gland that plays a central role in reproductive function. LH works closely with follicle-stimulating hormone (FSH) to regulate ovarian and testicular activity.
In women, LH triggers ovulation and supports progesterone production after ovulation. In men, LH stimulates testosterone production by the testes. Measuring LH helps assess how effectively the brain is communicating with the reproductive organs.
This test is commonly used in fertility assessments, menstrual disorder investigations and endocrine evaluations.
Why do I need a test for Luteinising Hormone?
You may need this test if you are experiencing fertility issues, irregular menstrual cycles or symptoms of hormonal imbalance. Abnormal LH levels can indicate problems with ovulation, pituitary function or gonadal health.
Testing LH also helps distinguish between primary reproductive organ disorders and conditions affecting the pituitary or hypothalamus.
Symptoms and scenarios where testing is recommended:
- Difficulty conceiving
- Irregular or absent periods
- Suspected ovulation problems
- Polycystic ovary syndrome (PCOS) assessment
- Symptoms of low testosterone
- Delayed or early puberty
- Suspected pituitary disorders
- Fertility or hormonal investigations
Benefits of the Luteinising Hormone Test
- Supports fertility assessment
Helps evaluate ovulation and reproductive timing. - Assesses pituitary gland function
Indicates hormonal signalling from the brain. - Identifies ovulatory disorders
Useful in PCOS and cycle irregularities. - Evaluates testosterone regulation in men
Supports assessment of male reproductive health. - Guides further hormone testing
Helps determine next diagnostic steps. - Assists in puberty evaluation
Useful in delayed or precocious puberty. - Supports endocrine diagnosis
Helps differentiate central vs peripheral causes. - Simple and reliable blood test
Requires only a standard blood sample.
Step-by-Step: How Testing Works
Choose your preferred testing method
You can attend one of our UK partner clinics or arrange a home or hotel visit with a mobile phlebotomist.
Option 1 – In-Clinic Blood Draw
- Select your nearest UK clinic and book an appointment.
- A clinician or phlebotomist collects a venous blood sample.
- The sample is analysed for luteinising hormone levels.
- Results are delivered securely online.
Option 2 – Home or Hotel Phlebotomy (+£60)
- Book a UK-wide home or hotel visit at a convenient time.
- A trained phlebotomist collects your blood sample on-site.
- The sample is transported to the laboratory.
- Results are uploaded digitally without the need to travel.
Your Results Explained
Low Levels
Low luteinising hormone levels may indicate pituitary or hypothalamic dysfunction.
This can affect ovulation in women and testosterone production in men.
UK reference ranges vary by sex, age and menstrual cycle phase.
Normal Levels
Normal LH levels suggest appropriate hormonal signalling between the brain and reproductive organs.
This supports normal ovulation or testosterone production.
High Levels
Elevated LH levels may indicate ovarian insufficiency, testicular failure or PCOS.
High levels may also be seen during the mid-cycle ovulatory surge in women.
How It Works
Simple steps to get your results
Book Online
Choose your test online and book in seconds. Select your preferred clinic location or home visit option.
Visit or Test at Home
Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.
Get Your Results
Your sample is analysed by accredited UK laboratories, with secure results delivered directly to you.
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WhatsApp UsHow to Prepare for Your Test
Follow these guidelines for accurate results
Sample Timing
Where possible, attend your blood test between 7am and 12pm. Please wait until any short-term illness or infection has fully resolved before testing. Avoid intense exercise for 24–48 hours beforehand, as this can affect certain markers.
Fasting & Hydration
Fasting is not always required, but some tests may recommend it. If fasting is advised, avoid food for 8–12 hours before your appointment and drink water only. Stay well hydrated, as this helps with sample collection and accuracy.
Medications & Supplements
Continue prescribed medications unless advised otherwise by your clinician. Avoid vitamin, mineral, or biotin supplements for at least 24–48 hours before your test, as these can interfere with results. If you are unsure about any medication or supplement, please let us know before your appointment.
Hormones & Menstrual Cycle
For hormone-related tests, timing within your menstrual cycle may be important. If relevant, follow any specific guidance provided on your test page.
If you have any questions or special circumstances, our team is happy to advise before your appointment.