occult bleeding

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Related to occult bleeding: hematochezia


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.
References in periodicals archive ?
Of these, 5 patients were classified as having overt and 2 as having occult bleeding. Refer to Table 1 for the relevant VCE findings.
Several research groups have reported occult bleeding in marathon runners, using pre-and post-race stool guaiac testing with the prevalence of blood in post-race specimens ranging from 8 to 30%(7).
Stelling, Maimon, Smith, Haddy, and Markert (1990) compared five different fecal occult blood tests for early detection of gastrointestinal pathology and recommended that the guiac test be used in combination with the monoclonal nonspecific test for human hemoglobin for mass screening and early detection of occult bleeding. Regardless of the setting, there is some consensus that the guiac assay is a more reliable indicator for adults when used in conjunction with other diagnostic tests.
It helps clinicians to quickly detect chronic or acute anemia, to identify occult bleeding earlier and to manage blood transfusions more effectively.
The doctor noted a "slightly inflamed hemorrhoid" on anoscopy, but no bleeding from the hemorrhoid; he didn't test for occult bleeding.
* Is the syncope a symptom of an occult noncardiac life-threatening process (for instance, pulmonary embolism, occult bleeding, transient ischemic attack, or subarachnoid hemorrhage)?
The oldest indicator for occult bleeding is gum guaiac, in use from the 1860s.
Masimo's noninvasive and continuous total hemoglobin monitoring (SpHb[TM]) may help clinicians quickly detect chronic or acute anemia, identify occult bleeding earlier and more effectively manage blood transfusions.
[23] Occult bleeding occurred in 2 of 75 (2.6%) patients receiving antacid and in 3 of 80 (3.8%) patients receiving sucralfate (not statistically significant).