Libido disorder is usually diagnosed on the basis of history and physical examination.
Laboratory parameters of the 1st order – obligatory laboratory tests.
- Small blood count
- Testosterone (male sex hormone) [Note: androgen serum concentrations do not correlate with the expression of libido disorder].
- DHEA-S (dehydroepiandrosterone sulfate).
- FSH, estradiol – as far as not yet menopause.
- Thyroid parameters – TSH
- Prolactin
Laboratory parameters 2nd order – depending on the results of the history, physical examination, etc. – for differential diagnostic clarification.
- Fasting glucose (fasting blood glucose), if necessary oral glucose tolerance test (oGTT).
- Liver parameters – alanine aminotransferase (ALT, GPT), aspartate aminotransferase (AST, GOT), glutamate dehydrogenase (GLDH) and gamma-glutamyl transferase (gamma-GT, GGT); alkaline phosphatase, bilirubin.
- Renal parameters – urea, creatinine, cystatin C or creatinine clearance, if necessary.
- Total cholesterol, LDL cholesterol, HDL cholesterol; triglycerides.
- Thyroid parameters – TSH, fT4 – to exclude (latent) hypothyroidism (hypothyroidism) in hyperprolactinemia (when prolactin levels are elevated).