Opening the pupil wide enables an eye care professional to see more of the retina, the light-sensitive layer of tissue at the back of the eye. Dilating (widening) the pupil permits the retina to be examined for signs of disease. To do this, drops are placed into the eye to dilate the pupil. After dilation, vision may remain blurred and the patient may be bothered by the brightness of the sun for several hours.
- Test, radionucleide stress
This procedure involves injecting a radioactive isotope (typically thallium or cardiolyte) into the patient’s vein after which an image of the patient’s heart becomes visible with a special camera. The radioactive isotopes are absorbed by the normal heart muscle. Nuclear images are obtained in the resting condition, and again immediately following exercise. The two sets […]
- Test, rapid plasma reagin
A screening blood test for syphilis. Rapid plasma reagin is commonly abbreviated RPR. A negative (“nonreactive”) RPR test result is compatible with a person not having syphilis. However, a person may have a negative RPR test and still have syphilis since, in the early stages of the disease, the RPR often gives negative results. This […]
- Test, rapid strep
A diagnostic test commonly used to demonstrate whether streptococcus bacteria (“strep”) are present in the throat. A throat infection with strep needs to be treated with an antibiotic. The traditional test for a strep throat has been a throat culture; the major drawback is that the results of the throat culture take 2 to 3 […]
- Test, Rorschach
A psychological test involving inkblots. The inkblots are used to determine what a person perceives (reads into) in the enigmatic and highly ambiguous shapes. Ten standardized blots are shown one at a time to a subject and their responses are recorded. The Rorschach test became a common psychological test and is still in use in […]
- Test, stool occult blood
A test to check for microscopic blood in stool. (Fecal refers to stool. Occult means hidden.) Abbreviated stool OB.