Platform
Company
Immunology & Autoimmune
Review status
Currently under review
Pending specialist review and validation.
This test measures the amount of uroporphyrin your kidneys excrete in urine collected over 24 hours. Uroporphyrin is one of the porphyrins, a group of natural chemicals used to build heme, which helps carry oxygen and supports liver and nerve function. When the pathway that makes heme is disrupted, certain porphyrins can build up and spill into urine.
A 24-hour collection gives a more complete picture than a single spot sample because porphyrin excretion can vary during the day. The result helps your clinician understand whether porphyrin production and processing are normal, and it is often interpreted together with other porphyrins and related tests.
Doctors order this test when you have symptoms or a history that raises concern for a porphyria, especially forms that affect the skin such as porphyria cutanea tarda. It can also be used to monitor treatment and to look for secondary causes of porphyrin accumulation linked to liver disease, alcohol use, iron overload, or certain medicines.
Finding an increase may point to a problem in the heme pathway or to liver stress, which can guide next steps such as additional fractionated porphyrin testing, liver evaluation, or screening for triggers. Timely identification helps prevent complications like skin fragility, blistering, and chronic liver injury, and allows you and your care team to address reversible factors.
Your result will be compared with the laboratory’s reference interval for your age. Levels within the expected interval are generally reassuring. If the value is higher than expected, your clinician will consider your symptoms, exam, and other lab results to decide whether this fits with a porphyria or a nonporphyria cause such as liver inflammation or reduced kidney clearance.
Because uroporphyrin is only one part of the porphyrin pattern, your provider may order additional tests, including fractionated urinary porphyrins, delta-aminolevulinic acid and porphobilinogen, and blood or stool porphyrins. If a collection or handling issue is suspected, your team may repeat the 24-hour urine. Do not stop medicines or change habits without medical advice; discuss any concerns so you can plan safe follow-up.
Reference intervals vary by laboratory, analyzer, methodology, population, and units. The ranges shown here are for education only. Always interpret your results against the reference interval printed on your own lab report.
Porphyrins are light sensitive. The collection container should be protected from light and handled as instructed by the lab. Excess light can degrade porphyrins and lead to falsely low results.
Missing voids, timing errors, or overcollection can distort the final result. Carefully follow start and stop times, and keep all urine from the full 24-hour period as directed.
Alcohol, estrogens, iron supplements, smoking, and some drugs such as barbiturates or rifampin can influence porphyrin production or liver function. Always list all prescription and over-the-counter products and herbal supplements.
Liver inflammation, cholestasis, or iron overload can raise urinary uroporphyrin. Reduced kidney function can alter excretion and complicate interpretation; your clinician may review kidney and liver tests together.
Improper storage, lack of refrigeration when required, or delays in transport can change measured porphyrin levels. Follow all specimen handling instructions provided by the laboratory.
Hormonal changes may modify porphyrin metabolism or unmask porphyria in susceptible individuals. Tell your clinician if you are pregnant or using hormone therapy.
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