| LFA | left femoral artery; left frontal craniotomy; left fronto-anterior [fetal position]; leukocyte funct... |
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| LFT | latex fixation test; latex flocculation test; left fronto-transverse [fetal position]; liver functio... |
| PFT | pancreatic function test; parafascicular thalamotomy; posterior fossa tumor; prednisone, fluorouraci... |
| SFI | Sexual Function Index; Social Function Index |
| CEA | Carcino-Embryonic Antigen [HP 1825-6] ; Oncofetal Antigens ; Glycopro... |
| optical transfer function | <microscopy> The relationship between the image produced by an optical instrument and the amplitude and phase of a periodic specimen, measured at various spatial frequencies. The optical transfer function curve, which shows how well contrast is maintained for finer specimen details, is a complex function, of which the real term gives the ratio of amplitudes, and the imaginary term the phase relationships. When the brightness of the periodic specimen varies as a sine wave, the modulus or absolute value of the optical transfer function becomes the modulation transfer function, when the brightness varies as a square wave, the modulation transfer function is known as a contrast transfer function. Acronym: OTF (26 Mar 1998) |
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| ovarian function tests | Methods used for assessment of ovarian function. (12 Dec 1998) |
| ecosystem function | The collective intraspecific and interspecific interactions of the biota, such as primary and secondary production and mutualistic relationships. The interactions between organisms and the physical environment, such as nutrient cycling, soil development, water budgeting, and flammability. (09 Oct 1997) |
| function | The special, normal or proper physiologic activity of an organ or part. Origin: L. Functio, from fungi = to do (18 Nov 1997) |
| function corrector | A removable orthodontic appliance utilizing oral and facial muscle forces to move teeth and possibly change the relationship of the dental arches. (05 Mar 2000) |
| line spread function | A measure of the ability of a system to form sharp images; in radiology, determined by measuring the spatial density distribution on film of the X-ray image of a narrow slit in a dense metal, such as uranium; from this can be calculated the modulation transfer function. (05 Mar 2000) |
| liver function test | <investigation> A test that measures the blood serum level of several enzymes produced by the liver. An elevated liver function test is a sign of possible liver damage. Examples include: prothrombin time, PTT, serum glutamic oxaloacetic transaminase, serum glutamic pyruvic transaminase, gamma glutamyl transpeptidase, alkaline phosphatase and serum albumin. (14 Oct 1997) |
| lymphocyte function associated antigen | A member of the integrin family that is expressed on all leukocytes and binds to ICAM-1 and ICAM-2 on a variety of cells. (05 Mar 2000) |
| lymphocyte function-associated antigen-1 | A heterodimer molecule widely expressed on cells of haematopoietic origin. Cd11a antigen comprises the alpha chain and the CD18 antigen (antigens, CD18) the beta chain. Lfa-1 is a major receptor of T-cells, B-cells, and granulocytes. It mediates the leukocyte adhesion reactions underlying cytolytic conjugate formation, helper T-cell interactions, and antibody-dependent killing by natural killer cells and granulocytes. Intracellular adhesion molecule-1 (icam-1) has been defined as a ligand for lfa-1. (12 Dec 1998) |
| vein of vestibular aqueduct | A small vein accompanying the endolymphatic duct; it drains much of the vestibular portion of the labyrinth and terminates in the inferior petrosal sinus. Synonym: vena aqueductus vestibuli. (05 Mar 2000) |
| vein of vestibular bulb | The vein draining the bulb of the vestibule; a tributary of the internal pudendal vein. Synonym: vena bulbi vestibuli. (05 Mar 2000) |
| vestibular | <anatomy> Pertaining to or toward a vestibule. In dental anatomy, used to refer to the tooth surface directed toward the vestibule of the mouth. Origin: L. Vestibularis (18 Nov 1997) |
| vestibular anus | <anatomy, surgery> A congenital malformation in which the anus is imperforate but the rectum opens into the vagina just above the vulva. (05 Mar 2000) |
| vestibular apparatus | <anatomy> The receptor organ of the vestibular portion of the 8th cranial nerve, consisting of the three saemicircular canals and the otolith, located within the petrous portion of the temporal bone of the skull. (05 Mar 2000) |
| vestibular aqueduct | <anatomy> A small bony canal linking the vestibule of the inner ear to the posterior part of the internal surface of the petrous temporal bone. It surrounds the endolymphatic duct. (12 Dec 1998) |