title: Effect of time of exposure of serum to gel-barrier tubes on results for progesterone and some other endocrine tests.
mesh_terms: D005188:False Negative Reactions; D005260:Female; D005782:Gels; D006801:Humans; D011374:Progesterone / Q000097:blood*; D013048:Specimen Handling; D013997:Time Factors
chemical_list: D005782:Gels; D011374:Progesterone