| UE | uncertain etiology; under elbow; uninvolved epidermis; upper esophagus; upper extremity |
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| URI | uniform resource identifier; upper respiratory illness; upper respiratory infection |
| US | screen unsharpness ultrasonic, ultrasound; ultrasonography; unconditioned stimulus; unique sequence;... |
| AFP | Alpha(α) Feto-Protein [HP 1826, 1858, 1859, 2265] ; Oncofetal Antigens &nbs... |
| IDA | 1) Imino-Diacetic Acid 2) Iron Deficiency Anemia &nb... |
| upper | Being further up, literally or figuratively; higher in place, position, rank, dignity, or the like; superior; as, the upper lip; the upper side of a thing; the upper house of a legislature. The upper hand, the superiority; the advantage. See To have the upper hand, under Hand. Upper Bench, all those parts of the hull of a vessel that are properly above water. Upper world. The atmosphere. Heaven. This world; the earth; in distinction from the underworld. Source: Websters Dictionary (01 Mar 1998) |
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| upper abdominal periosteal reflex | Percussing the lower margin of the costal cartilages in the nipple line causes a contraction of the ipsilateral abdominal muscles (inconstant). (05 Mar 2000) |
| upper airway | The portion of the respiratory tract that extends from the nares or mouth to and including the larynx. (05 Mar 2000) |
| upper extremity | The shoulder, arm, forearm, wrist, and hand. Synonym: membrum superius, superior limb, thoracic limb, upper extremity. (05 Mar 2000) |
| upper extremity of fibula | The superior extremity of the fibula, which articulates by a facet with the undersurface of the lateral condyle of the tibia. Synonym: caput fibulae, upper extremity of fibula. (05 Mar 2000) |
| upper eyelid | The superior, larger and more mobile of the two eyelids which covers most of the anterior surface of the eyeball, including the cornea, when closed; a portion of the lacrimal gland and the aponeurosis of the levator palpebrae superioris muscle extend into it, the muscle opening the closed eye and providing additional elevation when the gaze is directed upward. Synonym: palpebra superior, upper lid. (05 Mar 2000) |
| upper GI haemorrhage | <gastroenterology> Diagnostic considerations: duodenal ulcer (40%), gastric ulcer (10-20%), diffuse erosive gastritis (15-20%), oesophageal varices (10%), Mallory-Weiss tears (10%), gastric carcinoma (less than 5%) (25 Jun 1999) |
| upper GI series | <investigation, radiology> A series of X-rays of the oesophagus, stomach, and small intestine (upper gastrointestinal, or GI, tract) that are taken after the patient drinks a barium solution. (barium is a white, chalky substance that outlines the organs on the X-ray.) (12 Dec 1998) |
| upper hybrid waves | <radiobiology> Similar to lower hybrid waves, but at a higher frequency. Not truly propagating waves, but plasma oscillations. (09 Oct 1997) |
| upper jaw | The upper jaw bone, takes part in the formation of the orbit, hard palate and nasal cavity. (27 Sep 1997) |
| upper jaw bone | The upper jaw bone, takes part in the formation of the orbit, hard palate and nasal cavity. (27 Sep 1997) |
| upper lateral cutaneous nerve of arm | <anatomy, nerve> The terminal branch of the axillary nerve supplying the skin over the lower portion of the deltoid and for a distance below its insertion. Synonym: nervus cutaneus brachii lateralis superior, upper lateral cutaneous nerve of arm. (05 Mar 2000) |
| upper lid | The superior, larger and more mobile of the two eyelids which covers most of the anterior surface of the eyeball, including the cornea, when closed; a portion of the lacrimal gland and the aponeurosis of the levator palpebrae superioris muscle extend into it, the muscle opening the closed eye and providing additional elevation when the gaze is directed upward. Synonym: palpebra superior, upper lid. (05 Mar 2000) |
| upper limb | The shoulder, arm, forearm, wrist, and hand. Synonym: membrum superius, superior limb, thoracic limb, upper extremity. (05 Mar 2000) |
| upper lip | The muscular fold forming the superior border of the mouth. Synonym: labium superius oris. (05 Mar 2000) |