Category: H
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Heat labile
Destroyed or changed easily by heat; unstable. Also called thermolabile.
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Humby knife
A cutting blade used to shave off a layer of skin, used in skin grafting.
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Hypopyon keratitis
A serpent-like ulcer with pus in the anterior chamber of the eye.
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Herpetic keratitis
Dendritic keratitis in herpes zoster or herpes simplex infections.
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Hemolytic jaundice
Jaundice caused by the fragmentation of red blood cells and the release of unconjugated bilirubin in the bloodstream. This finding is associated with hemolytic anemia (HA). Because the bilirubin is not conjugated by the liver, it is not soluble in water and does not discolor the inane. Many conditions may be responsible, including congenital HA;…
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Heel jar
The production of pain by having the patient stand on tiptoes and suddenly bring the heels to the floor. This physical finding may be suggestive of spinal disease, pelvic inflammatory disease in women, or kidney stones, among other ailments.
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Hydrogen ion
A hydrogen atom that has lost an electron. It has a positive charge, and its symbol is H⁺.
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Human insulin
Insulin prepared by recombinant DNA technology utilizing strains of Escherichia coli. In its effect it is similar to insulins secreted by the human pancreas.
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Hepatic insufficiency
An inability of the liver to produce albumin, bile, or proteins, or to detoxify xenobiotics that are taken up by the gastrointestinal tract.
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Herd instinct
The desire to be associated with a group.