Vitality Check-up : Fatigue & Burnout blood test with nutritionist in Zurich & Geneva

Tired of being tired? Exhausted before the day has even started, unable to concentrate, feeling cold all the time, or watching your motivation quietly disappear? You have probably been told your blood tests are normal. That your results look fine. That there is nothing wrong. But fatigue is not a state of mind. It has a measurable biological signature, and most standard blood tests are not designed to find it.

Our Vitality Check-up is the most comprehensive fatigue and burnout blood test available in Zurich and Geneva. It goes significantly further than a standard panel by including Reverse T3, morning cortisol, the HOMA index, and a full B vitamin profile. Developed in partnership with The Good Life Specialist,a nutritionist in Zurich, this nutrition blood test finds exactly what is draining your energy and translates your results into a concrete nutrition plan and health plan tailored to your biology.

Why standard fatigue blood tests miss the most important markers?

When you go to your GP and ask for a fatigue blood test, you typically get TSH, a complete blood count, and perhaps vitamin D. These are useful starting points. But they leave out the markers that most commonly explain why intelligent, otherwise healthy people feel persistently exhausted.

Reverse T3, morning cortisol, and the HOMA index are three of the most clinically relevant markers for chronic fatigue and burnout. They are almost never included in a standard panel. They are all included in the Vitality Check-up.

What does our Vitality Check-up examine?

1. Full thyroid panel (TSH, Free T3, Free T4, Reverse T3) 

   Most standard blood tests only check TSH. But TSH is a pituitary signal, not a cellular one. It tells you whether the thyroid gland is being stimulated, not whether the cells of your body are actually receiving and using active thyroid hormone. Free T3 and Free T4 provide that information. Reverse T3 goes further still. It is an inactive form of thyroid hormone that competes directly with Free T3 at the receptor level, blocking its action even when all other thyroid markers appear normal. Elevated Reverse T3 is one of the most common and most overlooked causes of persistent fatigue, cold sensitivity,slow digestion/digestive problems and brain fog. It is not tested in any standard blood panel in Switzerland.

2. Vitamins D,B12, B9 (Folate) & B6

   This group of vitamins is involved in virtually every energy-producing pathway in the body. B12, measured here as Holotranscobalamin, the active bioavailable form, is essential for the production of myelin, the protective sheath around nerve cells that enables efficient signal transmission. When B12 is low, the brain does not receive signals efficiently, leading to mental fatigue, difficulty concentrating, and mood instability. B9 and B6 work alongside B12 in the methylation cycle, a critical biochemical process that affects mood, energy, and cognitive function. Deficiencies in all four vitamins are extremely common in Switzerland, particularly during winter months.

3. HbA1c & HOMA index 

   HbA1c measures your average blood sugar over three months. The HOMA index goes further by calculating insulin resistance directly, using fasting glucose and fasting insulin together. Insulin resistance is a condition where the body's cells stop responding efficiently to insulin, forcing the pancreas to produce more and more to achieve the same effect. The result is chronic energy crashes after meals, difficulty concentrating, brain fog, unexplained weight gain, and persistent fatigue, often years before blood sugar levels become abnormal on a standard test. It is one of the most widespread and most under-diagnosed drivers of low energy in adults.

4. Full iron panel (Iron, Ferritin, Transferrin) 

   Iron deficiency is the single most common nutritional cause of fatigue, particularly in women of reproductive age. But the key marker is ferritin, the iron storage protein, not iron itself. Iron levels in the blood can appear normal while ferritin, and therefore your body's actual iron reserves, are critically depleted. Blood iron levels only tell us what is circulating right now; Ferritin reveals the bigger picture. As the protein responsible for iron storage, it is the most reliable way to identify if your body’s deep reserves are depleted. Low ferritin alone, even without anaemia, is sufficient to cause profound tiredness, hair loss, difficulty concentrating, and reduced exercise tolerance. Transferrin provides additional information about iron transport and absorption capacity.

5. Liver function (ASAT, ALAT, GGT) 

   The liver is central to hormone metabolism, toxin clearance, and energy regulation. Impaired liver function slows the clearance of cortisol and other stress hormones, amplifying the effects of adrenal dysfunction and contributing directly to fatigue, mood instability, and hormonal imbalance.

6. Cortisol (morning) 

   Cortisol is your primary stress hormone, and it follows a precise daily rhythm that is fundamental to energy regulation. It should be highest in the morning, peaking within 30 to 45 minutes of waking, to prepare the body for the demands of the day. This peak is called the cortisol awakening response. When it is blunted, the body simply cannot generate the biological readiness needed to feel energized and mentally sharp. Low morning cortisol is a direct biological marker of burnout, chronic stress overload, and adrenal fatigue. It is one of the most informative single measurements available for anyone experiencing persistent exhaustion in a demanding environment.