Improve Energy, Reduce Fatigue & Enhance Sleep
Struggling with low energy, constant fatigue or unrefreshing sleep? Our scientifically backed panels help you uncover the root causes with targeted testing, including a blood test for fatigue, advanced hormone testing, nutrient analysis and at-home sleep tests. Whether you need a thyroid function test, iron studies blood test, vitamin D blood test, vitamin B12 blood test, a cortisol test, or a complete DUTCH test, these assessments give you the insights you need to regain energy, improve sleep and support long-term wellbeing. A hormone imbalance is one of the most common hidden causes of persistent fatigue - testing can help you find out.
How i-screen works
01Order online
Choose your preferred blood test and place your order securely through our website.
02Receive pathology request form
We'll email you your pathology request form, which you'll need for your blood draw.
03Book an appointment
Book an appointment for your blood draw at a convenient time and location.
04Get your results
Your results land in your secure dashboard with plain-English explanations from our health team, typically within 2–3 weeks.
Want the most complete assessment of the causes behind low energy?
If fatigue is affecting your daily life, our comprehensive panels analyse hormones, nutrients, stress response and metabolism to give you the clearest picture of what’s driving your symptoms. These options combine a blood test for fatigue with deeper investigations into energy production and sleep regulation.
Complete Metabolic & Nutritional Profile. One test. Your whole-body metabolic and nutritional picture.
Urine test measuring organic acid markers relevant to nutrient, gut and metabolic health.
If you’re feeling exhausted all the time but you’re not sure why, this is the chronic fatigue test for you. Take out the guesswork and understand the simple changes you can make to improve your energy levels.
Is your thyroid draining your energy?
Thyroid issues are among the most common causes of fatigue. Our thyroid function test, thyroid antibodies test, and reverse T3 analysis uncover subtle thyroid imbalances that may be slowing your metabolism, disrupting sleep or causing persistent tiredness. Read our guide to 8 reasons to get your thyroid checked if you suspect your thyroid may be contributing to your symptoms.
1 in 7 individuals live with a thyroid condition with symptoms ranging from low energy and depression to unexplained weight gain and insomnia. If you don’t feel right but you can’t put your finger on why, this simple thyroid test can tell you if it's your thyroid.
If you’re looking for a comprehensive assessment of your thyroid function, including an investigation of an underlying autoimmune disorder, then this combined thyroid antibodies test and thyroid function test is the blood test for you.
Are you experiencing hidden nutrient deficiencies?
Low levels of iron, B12 and vitamin D are leading causes of fatigue, low mood and reduced resilience. These tests identify deficiencies quickly with a vitamin D blood test, vitamin B12 blood test, and iron studies blood test, helping you understand how nutrient status impacts your energy. Vitamin D in particular affects far more than bone health — read why vitamin D might be the mood hormone you’re overlooking.
Iron deficiency is the most common nutritional problem in the UK. A shortage of iron leads to anaemia and feelings of weakness, tiredness and dizziness.
Vitamin B12 is an essential vitamin that helps maintain healthy nerves and red blood cells and is also needed to make DNA. This simple vitamin B12 blood test will tell you if you have a deficiency.
Over 30% of adults are estimated to be vitamin D deficient which can cause muscle weakness and fatigue. This simple vitamin D test will tell you if you have a deficiency.
Many nutrients are absolutely essential for good health. It's possible to get most of them from a balanced, real food-based diet, however the typical modern diet lacks several very important nutrients. Find out your nutritional status with this simple nutrition blood test.
This dried blood spot test includes 26 essential and non essential amino acids. Testing amino acids helps assess nutritional status, metabolic function, and potential deficiencies or imbalances that may impact energy, mood, detoxification, and overall health. It can also reveal issues with protein digestion, absorption, or genetic metabolic pathways.
Is stress disrupting your hormones and energy?
Chronic stress can deplete your energy and disrupt key hormonal rhythms. Our cortisol test, Cortisol Awakening Response, and DUTCH test reveal how stress is impacting your body and whether adrenal fatigue-like patterns are present. Learn more about what your cortisol awakening response says about your stress resilience, and read how the DUTCH test can uncover hidden causes of fatigue.
The Cortisol Awakening Response saliva test provides information about the body's natural cortisol rhythms and response to stress, which may be useful in understanding various physical and mental health conditions.
Adrenal fatigue may be one of the most under diagnosed condition in western society. This adrenocortex stress test assesses your response to stress and provides valuable insights to help you balance your hormones.
The Advanced Dried Urine Hormone Test (ENDOMap) - is a complete analysis of your hormones using dried urine.
Is poor sleep impacting your recovery and mood?
Sleep issues are a major driver of fatigue. Our at-home sleep test options analyse melatonin, cortisol rhythms and sleep-regulating hormones to uncover why your sleep quality may be suffering.
Sleep is vital to good health. A lack of sleep affects mood, concentration, memory, weight and quality of life. This sleep test assesses the hormones which influence your sleep patterns.
The Cortisol Awakening Response saliva test provides information about the body's natural cortisol rhythms and response to stress, which may be useful in understanding various physical and mental health conditions.
The Advanced Dried Urine Hormone Test (ENDOMap) - is a complete analysis of your hormones using dried urine.