Porphobilinogen (PBG) is one of several types of porphyrins found in your body. Porphyrins help form many important substances in the body. One of these is ...

Proctosigmoidoscopy; Rigid sigmoidoscopy; Colon cancer sigmoidoscopy; Colorectal sigmoidoscopy; Rectal sigmoidoscopy; Gastrointestinal bleeding - ...

Polyp biopsy A polyp biopsy is a test that takes a sample of, or removes polyps (abnormal growths) for examination. How the Test is Performed Polyps are ...

Pleural fluid analysis Pleural fluid analysis is a test that examines a sample of fluid that has been collected in the pleural space. This is the space ...

Pleural fluid aspiration; Pleural tap Thoracentesis is a procedure to remove fluid from the space between the lining of the outside of the lungs (pleura) ...

Plethysmography - limb Limb plethysmography is a test that compares blood pressure in the legs and arms. How the Test is Performed This test may be done ...

Thrombocyte count A platelet count is a lab test to measure how many platelets you have in your blood. Platelets are parts of the blood that help the blood ...

The platelet aggregation blood test checks how well platelets, a part of blood, clump together and cause blood to clot. How the Test is Performed A blood ...

Random plasma renin; PRA The renin test measures the level of renin in blood. How the Test is Performed A blood sample is needed. How to Prepare for the ...

Plasma fibrinogen; Factor I; Hypofibrinogenemia test Fibrinogen is a protein produced by the liver. This protein helps stop bleeding by helping blood clots ...

Cholinesterase - blood Acetylcholinesterase; RBC (or erythrocyte) cholinesterase; Pseudocholinesterase; Plasma cholinesterase; Butyrylcholinesterase; Serum ...

Amino acids blood test Plasma amino acids is a screening test done on infants that looks at the amounts of amino acids in the blood. Amino acids are the ...

PRL; Galactorrhea - prolactin test; Infertility - prolactin test; Amenorrhea - prolactin test; Breast leakage - prolactin test; Prolactinoma - prolactin test; ...

serum; HPO4 -2 ; PO4 -3 ; Inorganic phosphate; Serum phosphorus The phosphorus blood test measures the amount of phosphate in the blood. How the Test is ...

The phosphorus blood test measures the amount of phosphate in the blood. Blood is drawn from a vein (venipuncture), usually from the inside of the elbow or the ...

Venipuncture is the collection of blood from a vein. It is most often done for laboratory testing. How the Test is Performed Most of the time, blood is drawn ...

Phlebogram - leg; Venography - leg; Angiogram - leg Venography for legs is a test used to see the veins in the leg. X-rays are a form of electromagnetic ...

Pheochromocytoma - MIBG; Neuroblastoma - MIBG; Carcinoid MIBG An MIBG scintiscan is a type of imaging test. It uses a radioactive substance (called a ...

Phenylalanine - blood test Serum phenylalanine screening is a blood test to look for signs of the disease phenylketonuria (PKU). The test detects abnormally ...

pH monitoring - esophageal; Esophageal acidity test Esophageal pH monitoring is a test that measures how often stomach acid enters the tube that leads from ...