About Us
Who We Are
Hormone Lab UK (Testfield UK Ltd) is the official UK provider of ZRT Laboratory testing, supplying trusted at-home hormone, neurotransmitter and toxic heavy metal testing kits to customers across the UK, Europe and internationally.
Our aim is to make high-quality laboratory testing more accessible by providing convenient sample collection at home, at work or through a healthcare professional. Our testing services enable individuals and practitioners to obtain clinically meaningful laboratory data without the need for a traditional clinic visit for sample collection.
Our Mission
We believe that understanding your health should be simple, accessible and convenient.
Our mission is to provide reliable and practical testing solutions that can help identify potential hormonal and other health-related imbalances at an early stage. By making laboratory testing easier to access, we aim to empower individuals and healthcare professionals with meaningful information to support informed healthcare decisions.
Why We Partner with ZRT Laboratory
ZRT Laboratory is a leading specialty diagnostic laboratory focused on hormone, neurotransmitter, thyroid, adrenal, fertility, heavy metal and wellness testing.
Founded in 1998 by biochemist and breast cancer researcher Dr. David Zava, PhD, ZRT Laboratory has developed an international reputation for scientific research, laboratory innovation and minimally invasive testing.
ZRT provides testing using a range of specimen types, including saliva, dried blood spot (DBS), dried urine and serum. These testing methods offer healthcare professionals flexibility when selecting an appropriate sample type for different clinical applications.
With more than 25 years of laboratory experience, over 11 million tests performed, and healthcare professionals in more than 96 countries, ZRT has established itself as an internationally recognised specialist laboratory.
ZRT is CLIA-certified and has worked with researchers, healthcare organisations, government agencies and academic institutions, including organisations such as the Centers for Disease Control and Prevention (CDC) and the National Institutes of Health (NIH).
Convenient and Flexible Testing
ZRT offers a comprehensive range of minimally invasive testing methods, including:
- Saliva testing
- Dried blood spot (DBS) testing
- Dried urine testing
This range allows the appropriate sample type to be selected according to the test and clinical application.
For hormone testing, ZRT has developed testing methodologies and reference ranges designed to account for factors such as age, menstrual status and hormone supplementation.
Most laboratory results are available within approximately 3–5 business days, allowing healthcare professionals to review results and make informed decisions promptly.
Advanced Laboratory Technology
Accuracy and analytical quality are central to ZRT's laboratory processes.
Samples are analysed using advanced technologies, including LC-MS/MS (liquid chromatography–tandem mass spectrometry) and ICP-MS (inductively coupled plasma mass spectrometry), together with rigorous laboratory quality-control procedures.
ZRT has participated in the CDC Hormone Standardization (HoSt) Program for testosterone and estradiol testing. The laboratory has also developed specialised saliva extraction methods designed to minimise background contamination and improve measurement of hormones present at low concentrations.
ZRT established the Salivary Proficiency Inter-laboratory Testing (SPIT) Program, supporting comparison of saliva testing performance between participating laboratories and contributing to higher analytical standards within the field.
Comprehensive Laboratory Reporting
ZRT laboratory reports are designed to provide healthcare professionals with more than individual laboratory values.
Where applicable, results can be considered alongside relevant information such as symptoms, hormone supplementation and clinical history. Previous results may also be available for comparison, helping healthcare professionals monitor changes over time.
Results are delivered securely through an online reporting platform, providing convenient access to laboratory information.
Clinical Support and Professional Education
ZRT is committed to supporting healthcare professionals through ongoing education and laboratory expertise.
Its professional resources include:
- Clinical education and webinars
- Technical resources and provider guides
- Patient information materials
- Scientific and laboratory reference materials
- Clinical consultation and support
These resources are designed to help healthcare professionals better understand laboratory testing and the interpretation and application of laboratory results within clinical practice.
Advancing Laboratory Science
Research and innovation remain central to ZRT Laboratory's work.
The laboratory collaborates with researchers, healthcare organisations, government agencies and academic institutions internationally. Through scientific research, peer-reviewed publications, conferences and continued development of laboratory technologies, ZRT continues to contribute to advances in hormone and wellness testing.
By partnering with ZRT Laboratory, Hormone Lab UK provides customers throughout the UK, Europe and internationally with access to specialist laboratory testing from an established, research-focused diagnostic laboratory.
What We Offer
Our testing portfolio covers a broad range of health and wellness areas, including:
- Hormone balance
- Menopause and women's health
- Andropause and men's health
- Thyroid function
- Adrenal health
- Fertility
- Neurotransmitters
- Toxic heavy metals
- Cardiometabolic health
- Vitamin and nutritional biomarkers
- Other specialised health biomarkers
Depending on the test, samples can be collected using saliva, dried blood spot or dried urine methods, making many of our tests suitable for convenient collection outside a traditional laboratory setting.
Our Commitment to You
We are committed to providing clear product information and a straightforward testing experience.
Each product listing provides information about:
- What the test measures
- The sample required
- How the sample is collected
- How the testing process works
- What happens after your sample is received
- How results are provided
Our customer service team is available Monday to Saturday, 9:30am–6:00pm UK time.
For assistance, please contact us at info@hormonelab.co.uk Messages received outside our office hours will be answered as soon as possible.
Hormone Lab UK (ZRT Laboratory)— making specialist laboratory testing more accessible, convenient and straightforward.