| determination | <cell biology> The committment of a cell to a particular path of differentiation, even though there may be no morphological features that reveal this determination. Generally irreversible, but in the case of imaginal discs of Drosophila that are maintained by serial passage, transdetermination may occur. (18 Nov 1997) |
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| eligibility determination | Criteria to determine eligibility of patients for medical care programs and services. (12 Dec 1998) |
| faecal fat determination | <investigation> A test that measures the amount of fat in the stool and the percentage of dietary fat that is absorbed. This test is used to evaluate potential fat malabsorption syndromes. Stools are collected for 24 hours. Normal values include less than 7 grams of fat per 24 hours, based on a diet of 100 grams of fat per day for 3 days before the test. Decreased fat absorption can be seen in biliary stricture, biliary cancer, celiac sprue, cholelithiasis, chronic pancreatitis, Crohn's disease, cystic fibrosis, acute pancreatitis, pancreatic cancer, radiation enteritis, short bowel syndromes (post surgical) and Whipple's disease. (27 Sep 1997) |
| abdominal pressure | Pressure surrounding the bladder; estimated from rectal, gastric, or intraperitoneal pressure. (05 Mar 2000) |
| absolute pressure | Pressure measured with respect to zero pressure. Compare: gauge pressure. (05 Mar 2000) |
| acoustic pressure | In ultrasound, the instantaneous value of the total pressure minus the ambient pressure; unit is pascal (Pa). (05 Mar 2000) |
| air pressure | The force per unit area that the air exerts on any surface in contact with it. Primarily used for articles pertaining to air pressure within a closed environment. (12 Dec 1998) |
| atmospheric pressure | The pressure at any point in an atmosphere due solely to the weight of the atmospheric gases above the point concerned. (12 Dec 1998) |
| back pressure | Pressure exerted upstream in the circulation as a result of obstruction to forward flow, as when congestion in the pulmonary circulation results from stenosis of the mitral valve or failure of the left ventricle. (05 Mar 2000) |
| back-pressure renal atrophy | <radiology> Caliectasis without obstruction, due to repeated episodes of obstruction, gradual loss of renal pyramids (12 Dec 1998) |
| barometric pressure | The absolute pressure of the ambient atmosphere, varying with weather, altitude, etc.; expressed in millibars (meteorology) or mm Hg or torr (respiratory physiology); at sea level, one atmosphere (atm, 760 mm Hg or torr) is equivalent to: 14.69595 lb/sq in, 1013.25 millibars, 1013.25 × 106 dynes/cm2, and, in SI units, 101,325 pascals (Pa). Synonym: atmospheric pressure. (05 Mar 2000) |
| bile duct pressure | <radiology> Normal: 15-20 cm H2O (12 Dec 1998) |
| biting pressure | Any force exerted upon the occlusal surfaces of teeth. Synonym: biting pressure. (05 Mar 2000) |
| vapor pressure | The partial pressure exerted by the vapor phase of a liquid. (05 Mar 2000) |
| gauge pressure | Pressure measured relative to ambient atmospheric pressure; at sea level, it is 1 atm less than the pressure in the atmosphere. Compare: absolute pressure. (05 Mar 2000) |