Objectives. To determine and correlate the bone mineral density (BMD) and the biochemical markers of bone metabolism in adults 30 to 40 years old from Lima, Perú, in year 2018. Methods. A total of 84 women and 53 men, 30 to 40 years old from Lima, Perú, were submmited to a descriptive, transversal study. They did not have symptoms nor treatment for bone metabolic diseases. Information about their present health state, personal and familiar physiological and pathological history and physical examinatión were registered. BMD was measured by dual energy-X-ray absorptiometry in spine, hip and forearm. Parathormone, osteocalcine, 25-hidroxi-vitamine-D, luteinizing hormone, estradiol in women, testosterone in men, calcium, phosphorus, alkaline fosfatase, total and fractionated proteins, creatinine were measured in blood; in urine N-telopéptide, calcium and pho...