Serotonin metabolite 5-hydroxyindoleacetic acid (5-HIAA) could therefore be a marker for acute appendicitis. Objective We tested urinary 5-HIAA concentrations in spot urine samples from children with ...

Sex drive changes with age across your life. For some, sexual activity may begin in the teenage years or 20s. Research suggests male sex drive (libido) peaks in the 20s. Females often see sexual ...