| F(ab')2 | fragment, antigen-binding [of immunoglobulins] |
|---|---|
| Fabc | fragment, antigen and complement binding [of immunoglobulins] |
| Facb | fragment, antigen, and complement binding |
| Fc | centroid frequency; fraction/centrifuge; fragment, crystallizable [of immunoglobulin] |
| Fc' | a fragment of an immunoglobulin molecule produced by papain digestion |
| Biernacki's sign | <clinical sign> Analgesia to percussion of the ulnar nerve in tabes dorsalis and dementia paralytica. (05 Mar 2000) |
|---|---|
| Biot's breathing sign | <clinical sign> Irregular periods of apnea alternating with four or five deep breaths; seen with increased intracranial pressure. (05 Mar 2000) |
| Biot's sign | <clinical sign> Abnormal breathing pattern characterised by periods of apnea and periods in which several breaths of similar volume are taken; seen with increased intracranial pressure. (05 Mar 2000) |
| Bird's sign | <clinical sign> The presence of a zone of dullness on percussion with absence of respiratory sign's in hydatid cyst of the lung. (05 Mar 2000) |
| Bjerrum's sign | A comet-shaped scotoma, occurring in glaucoma, attached at the temporal end to the blind spot or separated from it by a narrow gap; the defect widens as it extends above and nasally curves around the fixation spot, and then extends downward to end exactly at the nasal horizontal meridian. Synonym: Bjerrum's sign, sickle scotoma. (05 Mar 2000) |
| blueberry muffin sign | <radiology> Raised, purple skin lesions, dermal metastases of neuroblastoma (stage IV-S) (12 Dec 1998) |
| blue dot sign | <clinical sign> A blue or black spot visible beneath the skin on the cranial aspect of testis or epididymis. This is a torsed testicular appendage and is usually quite tender. (05 Mar 2000) |
| Blumberg's sign | <clinical sign> Pain felt upon sudden release of steadily applied pressure on a suspected area of the abdomen, indicative of peritonitis. (05 Mar 2000) |
| Bonhoeffer's sign | <clinical sign> Loss of normal muscle tone in chorea. (05 Mar 2000) |
| Bozzolo's sign | <clinical sign> Pulsating vessels in the nasal mucous membrane, noted occasionally in thoracic aneurysm. (05 Mar 2000) |
| Branham's sign | <clinical sign> Bradycardia following compression or excision of an arteriovenous fistula. (05 Mar 2000) |
| Braxton Hicks sign | <clinical sign> Irregular uterine contractions occurring after the third month of pregnancy. (05 Mar 2000) |
| Broadbent's sign | <clinical sign> A retraction of the thoracic wall, synchronous with cardiac systole, visible anywhere, but particularly in the left posterior axillary line; a sign of adherent pericardium. (05 Mar 2000) |
| Brockenbrough sign | <clinical sign> Absolute decrease in pulse pressure of the beat immediately following a premature beat; a sign of idiopathic hypertrophic subaortic stenosis. (05 Mar 2000) |
| Brudzinski's sign | <clinical sign> A physical examination finding that can indicate inflammation of the meninges (meningitis), performed in two forms: passive flexion of one leg results in a similar movement on the opposite side or if the neck is passively flexed, flexion occurs in the legs. (27 Sep 1997) |