| prenatal | <obstetrics> Existing or occurring before birth, with reference to the foetus. Origin: L. Natalis = natal (18 Nov 1997) |
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| prenatal care | Care provided the pregnant woman in order to prevent complications, and decrease the incidence of maternal and prenatal mortality. (12 Dec 1998) |
| prenatal diagnosis | Determination of the nature of a pathological condition or disease in the postimplantation embryo, foetus, or pregnant female before birth. (12 Dec 1998) |
| prenatal exposure delayed effects | Delayed effects on offspring of maternal or foetal prenatal exposure to drugs, radiation and other physical agents, manipulation, nutrition, stress, etc. (12 Dec 1998) |
| prenatal life | That interval of life between conception and birth; in humans, usually divided into embryonic and foetal periods. (05 Mar 2000) |
| prenatal screening | Screening for the detection of foetal disease, usually by ultrasound examination or by testing amniotic fluid obtained by amniocentesis. Other screening techniques include testing maternal serum and placental biopsy. (05 Mar 2000) |
| ultrasonography, prenatal | The visualization of tissues during pregnancy through recording of the echoes of ultrasonic waves directed into the body. The procedure may be applied with reference to the mother or the foetus and with reference to organs or the detection of maternal or foetal disease. (12 Dec 1998) |
| Arneth formula | The normal, approximate ratio of polymorphonuclear neutrophils, based on the number of lobes in the nuclei, as follows: 1 lobe, 5%; 2 lobes, 35%; 3 lobes, 41%; 4 lobes, 17%; 5 lobes, 2%. (05 Mar 2000) |
| Bazett's formula | A formula for correcting the observed Q-T interval in the electrocardiogram for cardiac rate: corrected Q-T = Q-T sec/✓R -R sec. (05 Mar 2000) |
| Bernhardt's formula | <nutrition> A formula used to calculate the ideal weight, in kilograms, for an adult; it is the height in centimeters times the chest circumference in centimeters divided by 240. (14 Aug 2000) |
| Black's formula | A translation of Pignet's formula into British measurements: F = (W + C) -H; F is the empirical factor, W is the weight in pounds, C the chest girth in inches at full inspiration, and H the height in inches; a man is classed as very strong when F is over 120, strong between 110 and 120, good 100 to 110, fair 90 to 100, weak 80 to 90, very weak under 80. (05 Mar 2000) |
| Broca's formula | A fully developed man (30 years old) should weigh as many kilograms as he is centimeters in height over and above 1 meter. (05 Mar 2000) |
| Van Slyke's formula | The value obtained when the square root of the urine flow (when below 2 ml/min) is multiplied by the urine urea concentration and divided by the whole blood urea concentration; represents an old empirical adjustment for the effect of low urine flow on urea excretion; sometimes corrected for body size by dividing by some function of body weight or surface area. Later, plasma concentration was substituted for blood concentration in the calculation. The normal value is about 54 ml/min per 1.73 m2 in an adult person. Synonym: Van Slyke's formula. (05 Mar 2000) |
| Mall's formula | A formula for determining the age (in days) of a human embryo; calculated as the square root of its length (measured from vertex to breech) in millimeters multiplied by 100. (05 Mar 2000) |
| Ranke's formula | A = grams of albumin per liter of a serous fluid: then, A = (sp. Gr. -1000) × 0.52 -5.406. (05 Mar 2000) |