occult bleeding


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Related to occult bleeding: hematochezia

bleeding

 [blēd´ing]
1. escape of blood from an injured vessel; see also hemorrhage.
2. phlebotomy.
dysfunctional uterine bleeding bleeding from the nonmenstruating uterus when no organic lesions are present.
implantation bleeding that occurring at the time of implantation of the zygote in the decidua.
occult bleeding escape of blood in such small quantity that it can be detected only by chemical tests or by microscopic or spectroscopic examination.
bleeding time the time required for a standardized wound to stop bleeding. The bleeding time test is used as a screening procedure to detect both congenital and acquired platelet disorders; it measures the ability of platelets to arrest bleeding and hence gives an estimate of platelet number and level of functioning. There are several methods of performing the bleeding time. In Ivy's test, incisions are made on the forearm, a sphygmomanometer is inflated to a standard of 40 mm around the upper arm, and the time until cessation of bleeding is recorded. The template method is a variation in which a template with a slit in it is laid on the forearm, and the slit and the knife making the skin incision are both standardized. The most widely used template is the Simplate. Normally bleeding will cease in 2 to 9 minutes. Qualitative platelet disorders, thrombocytopenia (platelet count of less than 100,000/mm3), and the use of aspirin will prolong the bleeding time.

oc·cult blood

blood in the feces in amounts too small to be seen but detectable by chemical tests.

occult bleeding

See Occult blood.

bleeding

1. the escape of blood, as from an injured vessel. See also hemorrhage.
2. the purposeful withdrawal of blood from a vessel of the body; venesection; phlebotomy. See also blood sampling.

bleeding disorders
incomplete bleeding
the carcass of an animal slaughtered for meat which is incompletely bled out has a darker meat and more blood in vessels and the heart cavities than a properly slaughtered animal. This gives it an appearance resembling a fevered carcass.
occult bleeding
escape of blood in such small quantity that it can be detected only by chemical tests or by microscopic or spectroscopic examination.
bleeding time
the time required for a small pinpoint wound to cease bleeding. If done properly, the test can be helpful in determining the functional capacity of platelets and of vasoconstriction.
References in periodicals archive ?
The second poster, "Yield of Significant Neoplasia in Three Clinically Indicated Settings for Colonoscopy," compares the relative positive predictive value for cancer and large adenoma detection among colonoscopies that are indicated by obvious rectal bleeding, detection of occult bleeding, or for screening purposes.