| PAF | paroxysmal atrial fibrillation; peroxisomal assembly factor; phosphodiesterase-activating factor; pl... |
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| SF | Sabin-Feldman [test]; safety factor; salt-free; scarlet fever; screen film; seminal fluid; serosal f... |
| TF | free thyroxine; tactile fremitus; tail flick [reflex]; temperature factor; testicular feminization; ... |
| PT | pain threshold; parathormone; parathyroid; paroxysmal tachycardia; part time; patient; pericardial t... |
| PTA | parallel tubular arrays; parathyroid adenoma; percutaneous transluminal angioplasty; peroxidase-labe... |
| rapid plasma reagin | <investigation> The rapid plasma reagin test is similar to the VDRL test for diagnosing syphilis. This blood test is designed to detect an antibody substance in the bloodstream when syphilis infection is present. Early syphilis infections may be RPR negative. See: VDRL (17 Dec 1997) |
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| rapid plasma reagin test | A group of serologic test's for syphilis in which unheated serum or plasma is reacted with a standard test antigen containing charcoal particles; positive test's yield a flocculation. A modification, called the RPR (circle) card test, is widely used as a screening test. Synonym: RPR test. (05 Mar 2000) |
| renal plasma flow | <physiology> The amount of plasma that perfuses the kidneys per unit time, approximately 10% greater than effective renal plasma flow. It should be differentiated from the renal blood flow which refers to the total volume of blood flowing through the renal vasculature, while the renal plasma flow refers to the rate of plasma flow. (12 Dec 1998) |
| peak plasma drug concentration | <pharmacology> The highest level of drug that can be obtained in the blood usually following multiple doses. (09 Oct 1997) |
| granuloma, plasma cell | A slow-growing benign pseudotumour in which plasma cells greatly outnumber the inflammatory cells. (12 Dec 1998) |
| granuloma, plasma cell, orbital | A distinctive, chronic inflammatory reaction in the orbital tissues of the eye, of unknown aetiology, that may closely resemble a neoplasm and often becomes bilateral. Symptoms include exophthalmos and congestion of the lids with oedema. When limitation of ocular motility also occurs, it is sometimes called orbital myositis. (12 Dec 1998) |
| granuloma, plasma cell, pulmonary | A pseudotumour of the lung composed of inflammatory cells and showing complete maturity of fibroblastic components with a striking lack of mitosis. It is also called postinflammatory pseudotumour and pseudoneoplastic pneumonitis. (berardi, r.s. Et al. Inflammatory pseudotumours of the lung. Surg gynecol obstet 156:89-96, jan 83) (12 Dec 1998) |
| collisionless plasma model | <radiobiology> Model of a plasma in which the density is so low, or the temperature so high, that close binary (two-body) collisions have practically no significance (on certain timescales) because the time scales of interest are shorter than the collision time. Yields valid physical results for timescales much shorter than the average collision time in a real plasma. (09 Oct 1997) |
| plasma | <haematology> Acellular fluid in which blood cells are suspended. Serum obtained by defibrinating plasma (plasma derived serum) lacks platelet released factors and is less suitable to support the growth of cells in culture. (13 Oct 1997) |
| plasma accelerator globulin | <chemical> Heat- and storage-labile plasma glycoprotein which accelerates the conversion of prothrombin to thrombin in blood coagulation. Factor v accomplishes this by forming a complex with factor xa, phospholipid, and calcium (prothrombinase complex). Deficiency of factor v leads to owren's disease. Chemical name: Blood-coagulation factor V (12 Dec 1998) |
| plasma albumin | <protein> The serum level of the low molecular protein albumin. Albumin, produced by the liver, plays an important role in maintaining plasma oncotic pressure. Normal serum albumin should be 3.5-5.0 grams per decilitre. Low serum albumin can be found in cases of liver disease and malnutrition. (27 Sep 1997) |
| plasma cell | <haematology> A terminally differentiated antibody forming and usually antibody secreting, cell of the B-cell lineage. (18 Nov 1997) |
| plasma cell balanitis | Benign circumscribed balanitis characterised microscopically by subepithelial plasma cell infiltration and clinically by small erythematous papular lesions. Synonym: balanitis circumscripta plasmacellularis, balanitis of Zoon, Zoon's erythroplasia. (05 Mar 2000) |
| plasma cell dyscrasia | A diverse group of diseases characterised by the proliferation of a single clone of cells producing a monoclonal immunoglobulin or immunoglobulin fragment (a serum M component). The cells usually have plasma cell morphology, but may have lymphocytic or lymphoplasmacytic morphology. This group includes multiple myeloma, Waldenstrom's macroglobulinaemia, the heavy chain disease, benign monoclonal gammopathy, and immunocytic amyloidosis. (05 Mar 2000) |
| plasma cell gingivitis | Intense hyperaemic oedema and inflammation of the gingiva resulting from a hypersensitivity reaction. A dense plasma cell infiltrate is seen in the lamina propria. Synonym: atypical gingivitis. (05 Mar 2000) |