Laboratório de Análises Clínicas de Barcelos, also known as Lac Barcelos – Mário Carvalho & Cª, S. A., is a private clinical laboratory serving Barcelos since 1979. The laboratory combines qualified staff with advanced technology and established methodologies, aiming to provide reliable results and personalized support.

Its clinical testing covers hematology, biochemistry, microbiology, immunology, laboratory endocrinology, functional studies of metabolites, organs and systems, drug monitoring, clinical toxicology, genetics, and molecular biology. Additional services include water analysis, anatomical pathology, monitoring for patients taking anticoagulants, home visits, cardiology examinations, genetic tests, and prenatal screening. The laboratory also works with recognized organizations through agreements and partnerships, and has arrangements with numerous entities.

Its services are available through its laboratory and collection point in the Barcelos area. Lac Barcelos is certified to NP EN ISO 9001:2015 for its clinical analysis activities and states that it meets applicable clinical laboratory requirements. With a history spanning generations, the organization emphasizes quality, trust, and ongoing attention to patient satisfaction