Mindblown: a blog about philosophy.
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Signature
The part of a prescription giving instructions to the patient. The portion of a doctor’s prescription, typically located on the medication container label, that provides instructions to the patient on how to administer the medicine.
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Signal-to-cut-off ratio
A laboratory comparison of the optical density of a specimen taken from a patient to the optical density of the laboratory’s positive control. In tests for antibodies to hepatitis C antibody, e.g., hepatitis C infection is not diagnosed unless a specific S/co is exceeded. Results that fall below the S/co can be found in noninfected…
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Signal void
A dark or blank space in a radiographic image of a fluid-filled structure.
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Cellular signal
A chemical released by cells and tissues to stimulate metabolic activities within those tissues or in other parts of the body. Neuro transmitters, hormones, peptides, cytokines, arachidonic acid derivatives, and other chemicals are all signaling molecules.
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Signa
A term used in writing prescriptions meaning to label the prescription according to the dose, route of administration, and frequency of medication.
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Sunset sign
Newborn assessment finding often associated with hydrocephaly; the newborn’s eyes are open with the irises directed downward, resembling the sun setting below the horizon.
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Steeple sign
Narrowing of the column of subglottic air in the trachea, seen on anteroposterior radiographs of the neck in children with croup.
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Spinnaker sail
An outline of the thymus of a child by radiolucent lines. It is seen on chest x-ray examinations of children with pneumomediastinum.
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Psoas sign
Abdominal pain produced by extension of the hip. The sign indicates a retrocecal or retroperitoneal lesion.
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Probable sign of pregnancy
Objective assessment findings that strongly suggest but do not confirm pregnancy.
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