Trusted At-Home Laboratory Testing in the UK and Europe

Hormone Lab UK is the official UK partner of ZRT Laboratory, providing access to world-class at-home laboratory testing across the United Kingdom, Europe and Worldwide. Since 2017, we have helped individuals, healthcare practitioners, and clinics access scientifically validated laboratory testing through one of the world's leading diagnostic laboratories.

We offer a comprehensive range of professional home test kits for hormones, thyroid health, fertility, adrenal function, neurotransmitters, cardiometabolic health, vitamin D, heavy metals, and essential elements. Every sample is analysed exclusively by CLIA-certified ZRT Laboratory using advanced LC-MS/MS (Liquid Chromatography-Tandem Mass Spectrometry) and ICP-MS (Inductively Coupled Plasma Mass Spectrometry) technology to deliver highly accurate, clinically reliable results.

Our easy-to-use home testing kits utilise scientifically validated saliva, dried blood spot (DBS), and dried urine spot (DUTS) collection methods, allowing you to complete your test from the comfort of your home. Each kit includes clear instructions, return packaging, and secure laboratory analysis, with confidential online results and specialist interpretation available for selected profiles.

Whether you are experiencing fatigue, chronic stress, poor sleep, unexplained weight changes, menopause symptoms, low testosterone, thyroid dysfunction, fertility concerns, adrenal imbalance, or simply want a better understanding of your health, our laboratory tests provide reliable clinical insights to help you and your healthcare practitioner make informed decisions with confidence.

Why Choose Hormone Lab UK?

• Official UK partner and authorised intermediary of ZRT Laboratory
• Serving customers throughout the UK and Europe since 2017
• Laboratory analysis performed exclusively by CLIA-certified ZRT Laboratory
• Advanced LC-MS/MS and ICP-MS analytical technology
• Convenient at-home saliva, dried blood spot (DBS), and dried urine spot (DUTS) testing
• Free UK delivery on all home test kits
• Secure and confidential online laboratory reports
• Comprehensive hormone, thyroid, fertility, adrenal, neurotransmitter, and wellness testing
• Test profiles for women, men, and children
• Specialist interpretation available on selected laboratory profiles

ZRT Laboratory Testing Services

Our extensive range of laboratory tests includes:

• Hormone Profile Testing
• Female Hormone Testing
• Male Hormone Testing
• Menopause Testing
• Testosterone Testing
• Fertility Testing
• Thyroid Function Testing
• Cortisol & Adrenal Function Testing
• Neurotransmitter Testing
• Heavy Metals & Essential Elements Analysis
• Cardiometabolic Health Testing
• Vitamin D Testing
• Acne Profile Testing
• Wellness & Preventative Health Assessments

Our scientifically validated testing helps identify hormonal imbalances, thyroid disorders, adrenal dysfunction, nutritional deficiencies, neurotransmitter imbalances, toxic heavy metal exposure, and cardiometabolic risk factors, supporting more personalised healthcare decisions.

Our Mission

At Hormone Lab UK, our mission is to make world-class laboratory testing simple, accessible, and reliable. By combining convenient home sample collection with internationally recognised laboratory expertise, we empower individuals and healthcare professionals with accurate clinical data that supports evidence-based, personalised healthcare.

Why We Partner with ZRT Laboratory

ZRT Laboratory is one of the world's leading diagnostic laboratories specialising in hormone, neurotransmitter, thyroid, adrenal, fertility and wellness testing.

Founded in 1998 by renowned biochemist and breast cancer researcher Dr. David Zava, PhD, ZRT Laboratory is a globally recognised, CLIA-certified diagnostic and research laboratory dedicated to advancing hormone and wellness testing. Through continuous scientific research, innovation, and education, ZRT has developed convenient, minimally invasive testing solutions for hormones, neurotransmitters, heavy metals, and many other health biomarkers using saliva, dried blood spot (DBS), dried urine (DUTS), and serum samples.

From its inception, ZRT has remained committed to one goal: delivering accurate, clinically meaningful laboratory results that help healthcare professionals make informed, evidence-based decisions for their patients.

Today, ZRT is internationally recognised as a leader in at-home saliva hormone testing and dried blood spot testing, and was the laboratory that pioneered Dried Urine Testing (DUTS) for hormone assessment. While the laboratory has continually expanded its testing technologies and services, its commitment to simple, convenient sample collection and exceptional analytical quality has remained unchanged.

With more than 25 years of experience, over 11 million laboratory tests performed, and healthcare professionals in over 96 countries relying on its expertise, ZRT has earned a reputation for scientific excellence. Its work is recognised by organisations including the Centers for Disease Control and Prevention (CDC), the National Institutes of Health (NIH), and leading universities around the world.

Flexible and Convenient Testing

ZRT offers one of the most comprehensive selections of minimally invasive laboratory testing methods, including saliva, dried blood spot, dried urine, and serum testing. This flexibility enables healthcare professionals to select the most appropriate sample type for each patient and clinical application.

For hormone testing, first-morning saliva samples accurately reflect peak hormone levels and align with reference ranges based on the timing of hormone supplementation. Unlike many laboratories, patients can usually continue their hormone therapy before testing because ZRT has established reference ranges that account for age, menstrual status, and different forms of hormone supplementation.

Most laboratory results are available within 3–5 business days, allowing prompt clinical assessment and treatment planning.

Exceptional Scientific Accuracy

Every sample is analysed under rigorous quality control procedures using advanced laboratory technologies, including LC-MS/MS and ICP-MS, to ensure highly accurate and reproducible results.

ZRT is the only specialty hormone laboratory to qualify for the CDC Hormone Standardization (HoSt) Program for both testosterone and estradiol testing. The laboratory also uses a unique saliva extraction process that helps eliminate background contamination, improving the accuracy of low-concentration hormone measurements such as estradiol.

To promote excellence across the industry, ZRT established the Salivary Proficiency Inter-laboratory Testing (SPIT) Program, which regularly compares saliva testing performance between participating laboratories to help maintain the highest analytical standards.

Comprehensive Laboratory Reports

ZRT's physician-reviewed reports provide more than laboratory values alone. Results are interpreted alongside reported symptoms, hormone supplementation, and relevant clinical information to provide meaningful insights for healthcare professionals.

Where appropriate, previous laboratory results are included to allow comparison over time, helping monitor treatment effectiveness and patient progress. Reports are delivered securely through an online platform for convenient access.

Clinical Support and Professional Education

ZRT is committed to supporting healthcare professionals through ongoing clinical education and expert guidance. Clinical consultants are available to discuss laboratory testing and hormone therapy, while educational webinars, technical resources, provider guides, patient information sheets, and scientific reference materials help clinicians stay informed about the latest developments in laboratory medicine.

Advancing Laboratory Science

Research remains central to ZRT Laboratory's mission. The laboratory collaborates with researchers, government agencies, healthcare organisations, military research programmes, and leading academic institutions worldwide, including the CDC and NIH. Through peer-reviewed publications, scientific conferences, and continuous innovation, ZRT continues to advance the science of hormone and wellness testing while helping improve patient care around the world.

By partnering with ZRT Laboratory, Hormone Lab UK gives customers throughout the UK and Europe access to internationally trusted, research-backed laboratory testing that supports informed, personalised healthcare decisions.