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Porphyrins - blood
Definition:
Total porphyrin levels measure total red blood cell porphyrins. Porphyrins are pigments found in animals and plants. They are involved in the formation of many important substances in the body including hemoglobin, which carries oxygen in the blood. Text Continues Below
Coproporphyrin, protoporphyrin, and uroporphyrin are three porphyrins related to red blood cells, which can normally be measured in small amounts in the human blood stream. Protoporphyrin is normally found in highest quantity, and thus this test is also known as the PROTO test. Additional tests are needed to show the levels of specific porphyrins. Alternative Names:
Uroporphyrin levels; Protoporphyrin levels; Porphyrins - total; Coproporphyrin levels How the test is performed:
Blood is drawn from a vein, usually from the inside of the elbow or the back of the hand. The puncture site is cleaned with antiseptic. An elastic band is placed around the upper arm to apply pressure and cause the vein to swell with blood. A needle is inserted into the vein, and the blood is collected in an air-tight vial or a syringe. During the procedure, the band is removed to restore circulation. Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding. In infants or young children: The area is cleansed with antiseptic and punctured with a sharp needle or a lancet. The blood may be collected in a pipette (small glass tube), on a slide, onto a test strip, or into a small container. A bandage may be applied to the puncture site if there is any bleeding. The sample is then placed in ice and taken immediately to the laboratory. How to prepare for the test:
Fasting for 12 - 14 hours prior to this test is required. You may drink water right before the test.
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