| rOEF | regional oxygen extraction fraction |
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| RVEF | right ventricular ejection fraction; right ventricular end-flow |
| SF | Sabin-Feldman [test]; safety factor; salt-free; scarlet fever; screen film; seminal fluid; serosal f... |
| SPF | skin protection factor; specific-pathogen free; spectrophotofluorometer; S-phase fraction; split pro... |
| TNF | true negative fraction; tumor necrosis factor |
| fraction of inspired oxygen |
ABBR: FIO 2. The concentration of oxygen in the inspired air, esp. that supplied as supplemental oxygen by mask or catheter. Concentrations of oxygen greater than 50
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| fractional injection |
The process of injecting small amounts at a time until the total injection is complete.
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| fractional oxyhemoglobin |
SYMB: FO2Hb. The ratio of the substance fraction of oxyhemoglobin to the substance fraction of all forms of hemoglobin. This quantity takes into account the effects of abnormal hemoglobins such as carb
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| fractional shortening |
The reduction of the length of the end-diastolic diameter that occurs by the end of systole. Like the ejection fraction, this is a measure of the heart's muscular contractility. If the diameter fails to shorten by at least
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| fractional test meal |
Extended examination of the stomach contents. First the residual contents are removed and then the test meal is given. After the meal, assessments of gastric emptying, gastric acidity, pancreatic secretion, or nutrient absor
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