Low Libido in Men: The Complete Medical Testing Guide
If you've experienced a prolonged drop in libido, understanding the underlying causes is crucial. This guide covers the essential medical tests that can identify hormonal imbalances, nutrient deficiencies, and other factors affecting male sex drive.
1. Comprehensive Hormone Panel
Hormonal imbalances are among the most common causes of low libido in men. Even normal testosterone levels may need further investigation:
- Total Testosterone: While 432 ng/dL falls within normal range, optimal levels for libido may be higher. Consider multiple tests throughout the day.
- Free Testosterone: Measures bioavailable testosterone not bound to proteins like SHBG.
- Sex Hormone Binding Globulin (SHBG): High levels can reduce free testosterone availability.
- Estradiol (E2): Elevated estrogen levels in men can suppress testosterone.
- DHEA-S: Precursor to testosterone that indicates adrenal function.
- LH and FSH: Pituitary hormones that regulate testosterone production.
2. Vitamin and Nutrient Testing
Key nutrients that support hormone production and energy metabolism:
- Vitamin B12: Critical for energy and neurological function
- B-Complex Vitamins: Including B6 and folate for hormone regulation
- Vitamin D: Directly correlated with testosterone levels
- Magnesium: Involved in 300+ enzymatic processes
- Zinc: Essential for testosterone synthesis
3. Cortisol and Stress Hormones
- Salivary Cortisol (AM/PM): Chronic stress elevates cortisol which suppresses testosterone
4. Thyroid Function Tests
- TSH, Free T3, Free T4: Hypothyroidism causes fatigue and low libido
- Reverse T3: Can block active thyroid hormone
5. Additional Important Tests
- Prolactin: Already ruled out in your case
- Comprehensive Metabolic Panel (CMP): Checks liver/kidney function
- Lipid Panel: Cholesterol is precursor for hormone production
Next Steps for Diagnosis and Treatment
Work with a healthcare provider to interpret results and develop a targeted treatment plan. Addressing hormone imbalances, nutrient deficiencies, and thyroid issues can often restore healthy libido.
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