CPT® Code 84110

Porphobilinogen (PBG) is a type of porphyrin, which is a group of organic compounds that play a crucial role in the body's production of heme, an essential component of hemoglobin found in red blood cells. Under normal circumstances, the body metabolizes PBG and other porphyrins into heme through a series of enzymatic reactions. However, when there is a deficiency in one of the enzymes involved in this heme synthesis pathway, PBG and other porphyrins can accumulate in the body, leading to various health issues. The measurement of PBG levels in urine is critical for diagnosing porphyria, a hereditary metabolic disorder characterized by such enzyme deficiencies. This disorder can manifest in various symptoms, including abdominal pain, neurological complications, and skin sensitivity. The testing for PBG is performed on urine samples, as porphyrins are excreted through urine. The quantitative assessment of PBG levels is typically conducted using advanced techniques such as ion exchange chromatography and spectrophotometry, which provide precise measurements of PBG concentration. A 24-hour urine collection is generally preferred for this test, although a random urine sample may be utilized during acute episodes of symptoms to facilitate timely diagnosis.