a technique in which cells are tagged with a fluorescent dye and then directed single file through a laser beam. The intensity of *fluorescence induced by the laser beam is proportional to the amount of DNA in the cells.
(FFR) a technique used to quantify the severity of a coronary artery narrowing. During *cardiac catheterization, a specialized wire is passed down the coronary artery to measure pressure. The ratio of the pressure measured downstream of the narrowing to the pressure measured upstream is derived (this ratio also applies to coronary flow). When the ratio is below a certain threshold, flow restriction by the narrowing is deemed to be significant and *percutaneous coronary intervention is likely to be beneficial.... fractional flow reserve
(PEFR) the maximum rate at which a person can forcibly expel air from the lungs at any time, expressed usually in litres per minute (occasionally in litres per second). A low value can help diagnose asthma in the correct clinical context, and differences between the morning and evening values can also be a feature of poor control of asthma. There is a place for PEFR in the monitoring of acute exacerbations of chronic pulmonary obstructive disease (COPD) but not in the diagnosis of COPD.... peak expiratory flow rate
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