Fatigue Isn’t Random: 5 Key Biomarkers to Check When Energy Runs Low

Feeling tired all the time? Your blood might have the answer.

We all feel exhausted sometimes. But if low energy has become your baseline—even after rest—it’s time to dig deeper.

At Labology, we believe fatigue isn’t something you should ignore or simply "push through." Your body might be signalling an underlying issue—and a simple blood test can help you understand what’s really going on.
Here are five key biological markers that can help uncover the root cause of your fatigue.

🩸 1. Anemia or Silent Inflammation: Complete Blood Count (CBC)

Your blood is your body's messenger. A Complete Blood Count (CBC) checks red and white blood cells—revealing early signs of:

• Anemia, which limits oxygen delivery to your tissues

• Silent infections or inflammation, which can drain your energy

When to test: If you feel pale, weak, short of breath, or just not like yourself for more than a few weeks.

🔋 2. Iron & Ferritin: Fuel for Your Cells

Iron helps your red blood cells carry oxygen throughout your body. If your iron stores (ferritin) are even slightly low, you might feel constantly tired—even if your hemoglobin levels look normal.
At Labology, we check both ferritin and transferrin saturation to assess how well your body is using and storing iron.

When to test: If you’re feeling sluggish, dizzy, or out of breath easily—especially if you menstruate, exercise intensely, or eat little red meat.

🧠 3. Vitamin B12 & Folate: For Energy and Focus

These vitamins support red blood cell production and nervous system function. A deficiency in vitamin B12 or folate (B9) can cause:

• Persistent fatigue

• Brain fog

• Tingling or numbness in your hands or feet

We test the active form of B12 (holotranscobalamin)—a more sensitive and accurate way to detect early deficiencies.

When to test: If you feel mentally foggy, have trouble concentrating, or follow a vegetarian or vegan diet.

☀️ 4. Vitamin D: More Than Just Sunshine

Vitamin D helps regulate energy, muscle function, mood, and immunity. A deficiency is common—especially in the winter months—and can contribute to:

• Ongoing fatigue

• Low mood

• Frequent colds or infections

When to test: If you feel unusually tired, get sick easily, or haven’t seen the sun in a while.

⚙️ 5. Thyroid Function (TSH): The Engine Behind Your Metabolism

Your thyroid gland helps regulate your metabolism. If it’s not working properly, your entire system can slow down (hypothyroidism) or speed up (hyperthyroidism).
We measure TSH (thyroid-stimulating hormone), the most sensitive marker for detecting thyroid imbalance.

When to test: If you’re tired all the time and also experiencing weight changes, dry skin, cold intolerance, or hair loss.

Tired doesn’t mean helpless

Fatigue isn’t “just in your head.” It can be a sign of an underlying imbalance—and you deserve to know what’s going on.

With Labology’s Fatigue Check-Up, you get:
✔️ A 15-minute appointment, no prescription needed
✔️ A complete panel covering all 5 key areas
✔️ Clear, medically reviewed results within 48–72h
✔️ Follow-up support if you want it

📍 Available in Zürich and Geneva.
🖥️ Book now at labology.ch

What’s included in the Fatigue Check-Up

• Complete Blood Count (CBC)
• Ferritin + Transferrin Saturation
• Vitamin B12 (active) + Folate
• Vitamin D
• TSH (thyroid)

Your energy is not a mystery.

When you understand your biology, you can take real steps toward lasting vitality.
Your health is in your hands—and it starts with one simple blood test.