The aim of this research project, which is realised with the partnership of the enterprise Siamed'Xpress (Marseille), is to validate a new TSH diagnostic test in vitro, to allow an earlier screening of hypothyroidism. A serum bank will be conserved in the "Centre de Biologie Sud" ("Groupement Hospitalier Lyon Sud").

The serum samples will be assayed locally for the usual medical support to patients and after they will be sent to Siamed'Xpress (Marseille), where they will be assayed with the new diagnostic test. The results obtained from the two techniques will be compared.

The validation of this new TSH test represents a major advancement, since it could bring in the future to a therapeutic index which will allow clinicians to treat earlier asymptomatic patients with subclinical hypothyroidism.

Inclusion Criteria:

1. Subjects more than 18 years old
2. Thyroid test planned in the normal health care of patients
3. Subject who has been informed about "TSH Testing" study with a complete Subject Information Sheet and who has signed a consent form
4. Subject covered by the Health Social System

Exclusion Criteria:

1. Subjects with hyperthyroidism (clinical symptoms : weight loss with unaltered appetite, palpitations in the absence of cardio-vascular pathology, unusual and recent nervousness)
2. Subject not covered by the Health Social System
3. Subject who already participates to another clinical research study, which might interfere with TSH Testing Study
4. Pregnant, parturient or breastfeeding mother
5. Person deprived of freedom by a judicial or administrative decision
6. Person under a legal guardianship or unable to consent (MMSE score < 20/30 for the patients for whom this test has been performed).