| passive clot | A clot formed in an aneurysmal sac consequent to the cessation or slowing of circulation through the aneurysm. (05 Mar 2000) |
|---|---|
| medication, clot-dissolving | Drugs used to dissolve blood clots. Agents such as plasminogen-activator (t-pa) and streptokinase that are effective in dissolving clots and re-opening arteries. Used, for example, in the treatment of heart attacks. Clot-dissolvers are also called thrombolytic agents. (12 Dec 1998) |
| chicken fat clot | Clot formed in vitro or postmortem from leukocytes and plasma of sedimented blood. (05 Mar 2000) |
| clot | 1. To coagulate, said especially of blood. 2. A soft, nonrigid, insoluble mass formed when a liquid (e.g., blood or lymph) gels. Origin: O.E. Klott, lump (05 Mar 2000) |
| clot-dissolving medications | Agents such as plasminogen-activator (t-PA) and streptokinase that are effective in dissolving clots and re-opening arteries. Used, for example, in the treatment of heart attacks. Also called thrombolytic agents. (12 Dec 1998) |
| postmortem clot | A clot formed in the heart or great vessels after death. (05 Mar 2000) |
| currant jelly clot | A jelly-like mass of red blood cells and fibrin formed by the in vitro or postmortem clotting of whole or sedimented blood. (05 Mar 2000) |
| Schede's clot | Filling of the defect in bone, after removal of a sequestrum or scraping away carious material, by allowing the cavity to fill with blood which may become organised (Schede's clot). (05 Mar 2000) |
| euglobulin clot lysis time | A measure of the ability of plasminogen activators and plasmin to lyse a clot; normally, clot lysis is determined by the balance of factors which activate fibrinolysis (plasminogen activators and plasmin) and those which inhibit lysis; in certain conditions (e.g., carcinoma or hepatic insufficiency) activating factors predominate and can be measured by noting the time it takes the euglobulin fraction of plasma (excluding inhibitors of fibrinolysis) to clot. (05 Mar 2000) |
| laminated clot | A clot formed in a succession of layers such as occurs in the natural course of an aneurysm. (05 Mar 2000) |
| Abbe test plate | <equipment> A long, wedge-shaped coverslip about 0.20 mm thick at one end and 0.10 to 0.12 mm at the other end coated chemically with a silver film on which are ruled horizontal lines. at each variation in thickness of 0.01 mm there are vertical lines. By means of oblique illumination and by focusing on different portions of the plate, it is possible to determine the optimum coverslip thickness for any objective and also, for microscopes with drawtubes, the tube length for best objective performance. The approximate freedom from spherical and chromatic aberrations can also be estimated. Small isolated bits of silver near the edges of the lines form good objects for the star test (05 Aug 1998) |
| acetone test | A test for ketonuria; the suspected urine is shaken up with a few drops of sodium nitroprusside, and strong ammonia water is then gently poured over the mixture; if acetone is present, a magenta ring forms at the line of contact; tablets containing sodium nitroprusside and alkali are now more commonly used. (05 Mar 2000) |
| achievement test | A standardised test used to measure acquired learning, e.g., competence in a specific subject area such as reading or arithmetic, in contrast to an intelligence test which is a useful index of potential ability or learning. (05 Mar 2000) |
| acidified serum test | Lysis of the patient's red cells in acidified fresh serum, specific for paroxysmal nocturnal haemoglobinuria. Synonym: Ham's test. (05 Mar 2000) |
| acid loading test | <nephrology> This is a test used in the diagnosis of renal tubular acidosis. The patient takes ammonium chloride capsules for 3 days to acidify the blood (lower blood pH). A sample of the urine and the blood is then collected and the results are interpreted. (27 Sep 1997) |