Albumin levels are measured using blood or urine tests. The normal reference range for albumin in blood is typically 3.4 to 5.4 grams per deciliter (g/dL). In urine tests, the normal range is generally 0 to 8 milligrams per deciliter (mg/dL). Please note that these normal values may vary slightly depending on the specific laboratory, the samples analyzed, and the measurement methods used.