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Q

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1. quality factor; quantity. 2. Symbol for coulomb.

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q

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Symbol for long arm of a chromosome.

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Q10

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coenzyme Q10.

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QA

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Quality assurance.

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QALY

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quality-adjusted life-year.

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Q angle

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SEE: under angle.

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Qco2

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The number of microliters of CO2 given off per milligram of dry weight of tissue per hour.

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qd

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L. quaque die, every day.

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Image not available. Most experts in the prevention of health care errors recommend that the abbreviation q.d. be written out as "daily" in order to prevent communication errors. q.d. may be confused with q.i.d (four times a day), a mistake that could result in an unintentional overdose.

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qh, q1h

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L. quaque hora, every hour.

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Image not available. For safety, hourly medications are almost always written as q1h.

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qi, ch'i

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(chē) [Chinese qì, breath, air, spirit] In traditional Chinese medicine, the vital force or energy of life.

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q.i.d.

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L. quater in die, four times a day.

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Image not available. To avoid medication errors, this order should be written "four times daily."

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qi gong, qigong, chi kung

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(chē goong) [Chinese qì, breath, air, spirit + gōng, work, practice] An ancient Chinese practice that combines internal energy, movement, breathing exercises, meditation, and relaxation.

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QIV

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quadrivalent.

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Qo2

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The number of microliters of O2 taken up per milligram of dry weight of tissue per hour.

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qod

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Every other day. This abbreviation appears on the Joint Commission's "Do not use" list.

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Image not available. The "o" may be misinterpreted as a period or an "i."

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QRS complex

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SEE: under complex.

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QRST complex

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SEE: under complex.

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q.s.

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L. quantum sufficit, as much as suffices.

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Qsart

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quantitative sudomotor axon reflex.

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qt

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quart.

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QTc

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In electrocardiography, the duration of the QT interval adjusted for the patient's heart rate. SEE: QTc prolongation.

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QTcF

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In electrocardiography, the QT interval divided by the cube root of the RR interval (the measured time between one QRS complex and the next).

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QTc prolongation

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An increase in the duration of the QTc interval of the electrocardiogram to >450 ms ...

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