Blood Testing

TSH / T4 Ratio

The TSH:T4 Ratio measures the balance between thyroid-stimulating hormone (TSH) and thyroxine (T4) levels, key regulators of metabolism and energy production. In an optimal range, this ratio supports efficient metabolism, hormone regulation, and overall wellbeing. Monitoring it can help track energy, metabolic efficiency, and long-term health, giving you control over your lifestyle choices. By testing and tracking this biomarker, you gain valuable insights into your body's energy systems and can take proactive steps to optimise your health.

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What is the TSH:T4 ratio?

The TSH:T4 ratio compares thyroid-stimulating hormone (TSH) with thyroxine (T4), both essential for regulating metabolism and energy production.

Why does it matter for long-term health and wellbeing?

The TSH:T4 ratio plays a key role in regulating metabolic function, energy levels, and overall vitality. Tracking it can support better energy management, enhancing longevity and general wellbeing.

What's an optimal level of the TSH:T4 ratio?

Optimal levels may vary by individual, but generally, an ideal TSH:T4 ratio supports healthy metabolic function. Reference ranges for TSH and T4 can vary based on individual testing methods. For accurate interpretation, consult your healthcare professional.

What influences TSH:T4 levels?

Lifestyle factors such as diet, stress, and sleep can affect thyroid function and the TSH:T4 ratio. Genetics, age, and environmental factors also play a role in regulating these hormones.

What does it mean if the TSH:T4 ratio is outside the optimal range?

An imbalance in the TSH:T4 ratio may indicate irregular metabolic function or other aspects of wellness that could benefit from lifestyle adjustments.

How can I support healthy TSH:T4 levels?

Maintaining a balanced diet rich in nutrients, managing stress, and staying active can help support healthy thyroid function and keep the TSH:T4 ratio in a healthy range.

References

  1. Mayo Clinic. (2020). Thyroid function tests. Mayo Clinic.
  2. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). (2017).
  3. Hypothyroidism (underactive thyroid).
  4. .Brito, J. P., & Marqusee, E. (2014). The TSH and Free T4 ratio: Insights into thyroid function and its regulation. Journal of Clinical Endocrinology & Metabolism.
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A reflection of how your body is aging at the cellular level, linked to age risks and longevity.
Red Blood Cell (RBC) Count
Haemoglobin
Haematocrit
Mean Cell Volume (MCV)
Mean Cell Haemoglobin (MCH)
Mean Cell Haemoglobin Concentration (MCHC)
Red Cell Distribution Width (RDW)
Platelet Count
8 markers

Blood health

Key blood indicators like hemoglobin, inflammation, and oxygen transport for overall health.
Cholesterol Ratio
HDL Cholesterol
LDL Cholesterol
Non-HDL Cholesterol
Total Cholesterol
Triglycerides
6 markers

Heart health

Assesses cardiovascular health through cholesterol, lipids, and heart-related risk markers.
Cortisol
Dehydroepiandrosterone Sulfate (DHEA-S)
Free Thyroxine (T4)
Free Triiodothyronine (T3)
Thyroid stimulating hormone (TSH)
5 markers

Hormone balance

Evaluates hormone levels that impact energy, sleep, mood, and metabolism.
White Blood Cell (WBC) Count
Neutrophils
Lymphocytes
Monocytes
Eosinophils
Basophils
6 markers

Immune system

Measures immune activity and inflammatory responses to assess body defenses.
High-Sensitivity C-Reactive Protein (hs-CRP)
1 marker

Inflammation status

Tracks signs of chronic or acute inflammation that may affect long-term disease risk.
Bicarbonate
Chloride
Creatinine
Potassium
Sodium
Urea
Uric acid
Anion Gap
Estimated Glomerular Filtration Rate (EGFR)
9 markers

Kidney function

Assesses kidney health through creatinine and other markers of blood filtration.
Alanine Aminotransferase
Albumin
Alkaline Phosphatase
Aspartate aminotransferase (AST)
Bilirubin
Gamma-glutamyl Transferase (GGT)
Globulin
Total Protein
8 markers

Liver health

Measures liver enzymes and proteins responsible for detoxification and metabolic health.
Fasting Glucose
Fasting Insulin
Haemoglobin A1c (HbA1c) IFCC mmol/m
Haemoglobin A1c (HbA1c) NGSP/DCCT %
HOMA-IR score
5 markers

Metabolic health

Evaluates energy processing with glucose, HbA1c, insulin, and related biomarkers.
Magnesium
1 marker

Vitamins & minerals

Analyzes essential nutrients that support immunity, energy, and overall wellbeing.
Creatine Kinase
1 marker

Muscle strength

Assesses biomarkers related to muscle performance, function, and recovery.
Biological Age
1 marker

Biological age

A reflection of how your body is aging at the cellular level, linked to age risks and longevity.
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