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Medical Dictionary     Q
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  • Q
    Abbreviation for specific humidity.
  • Q angle
    the angle formed by lines representing the pull of the quadriceps muscle and the axis of the patellar tendon.
  • q arm of a chromosome

    q arm of a chromosome: The long arm of a chromosome. All human chromosomes have 2 arms - the p (short) arm and the q (long) arm - that are separated from each other only by a primary constriction, the centromere, the point at which the chromosome is attached to the spindle during cell division. The symbol "p" stands for "petit", small in French, while "q" was chosen merely because it was the next letter in the alphabet.

  • Q bands

    Q bands: The alternating bright and dull fluorescent bands seen on chromosomes under ultraviolet light after the chromosomes are stained with quinacrine. The Q stands for Quinacrine, an agent used as an antimalarial agent and, in the laboratory, as a fluorescent dye.

  • Q enzyme
    1,4-α-glucan branching enzyme in plants.
  • Q fever
  • q in population genetics

    q in population genetics: The frequency of the less common of two different alternative (allelic) versions of a gene. (The frequency of the more common allele is p).

  • Q tip test
    a test for determining the mobility of the urethra.
  • Q wave
    the initial deflection of the QRS complex when such deflection is negative (downward).
  • Q-banding
  • Q-banding stain
    a fluorescent stain for chromosomes that produces specific banding patterns for each pair of homologous chromosomes; centromeric regions of human chromosomes 3, 4, and 13 are specifically stained, as are satellites of some acrocentric chromosomes and the end of the long axon of the Y chromosome; banding patterns are similar to those obtained with G-banding stain; similar fluorescent stain results are seen with the antibiotics adriamycin and daunomycin, as well as tertiary dyes (butyl proflavine and DAPI), and the bisbenzimidazole dye Hoechst 33258.

    Alternate names: quinacrine chromosome banding stain

  • Q-fever

    Q-fever: An acute (abrupt-onset), self-limited febrile illness first reported in 1935 in Queensland, Australia. The Q is said not to be for Queensland, but for Query since the cause of the disease was long a query (question mark). It is now known to be due to Coxiella burnetti, a rickettsia (a peculiar group of bacteria). Aside from sudden onset of fever, there is headache, malaise, and pneumonia (interstitial pneumonitis) but no rash.

  • Q-switched laser
    (quality-switched); a laser in which the quality, or energy storage capacity is altered between a very high and a low value.
  • Q-TWiST
    Time without symptoms or toxicity; a quality of life measurement.
  • q.d.

    q.d.: Seen on a prescription, q.d. (or qd) means one a day (from the Latin quaque die). The abbreviation is sometimes written without a period in capital letters as "QD". However it is written, it is one of a number of hallowed abbreviations of Latin terms that have been traditionally used in prescriptions to specify the frequency with which medicines should be taken. Other examples include: b.i.d. (bid or BID) is twice a day; b.i.d.. stands for "bis in die" (which means, in Latin, twice a day). t.i.d. (or tid or TID) is three times a day ; t.i.d. stands for "ter in die" (in Latin, 3 times a day). q.i.d. (or qid or QID) is four times a day; q.i.d. stands for "quater in die" (in Latin, 4 times a day). q_h: If a medicine is to be taken every so-many hours, it is written "q_h"; the "q" standing for "quaque" and the "h" indicating the number of hours. So, for example, "2 caps q4h" means "Take 2 capsules every 4 hours."

  • q.h.

    q.h.: Abbreviation for "every hour." On a prescription or doctor's hospital orders, q.h. means every hour. Also written qh (without the periods). From the Latin quaque meaning once + h for hour. However it is written, it is one of a number of hallowed abbreviations of Latin terms that have been traditionally used in prescriptions to specify the frequency with which medicines should be taken. Other examples include: q.d. (qd or QD) is once a day; q.d. stands for �quaque die� (which means, in Latin, once a day). b.i.d. (bid or BID) is twice a day; b.i.d. stands for �bis in die� (which means twice a day). t.i.d. (or tid or TID) is three times a day ; t.i.d. stands for �ter in die� (in Latin, 3 times a day). q.i.d. (or qid or QID) is four times a day; q.i.d. stands for �quater in die� (in Latin, 4 times a day). q_h: If a medicine is to be taken every so-many hours, it is written �q_h�; the �q� standing for �quaque� and the �h� indicating the number of hours. So, for example, �2 caps q4h� means �Take 2 capsules every 4 hours.�

  • q.i.d.

    q.i.d.: Seen on a prescription, q.i.d. (or qid) means 4 times a day (from the Latin quater in die). The abbreviation q.i.d. is also sometimes written without a period in capital letters as �QID�. However it is written, it is one of a number of hallowed abbreviations of Latin terms that have been traditionally used in prescriptions to specify the frequency with which medicines should be taken. Other examples include: q.d. (qd or QD) is once a day; q.d. stands for �quaque die� (which means, in Latin, once a day). b.i.d. (or bid or BID) is two times a day; b.i.d. stands for �bis in die� (in Latin, 2 times a day). t.i.d. (or tid or TID) is three times a day ; t.i.d. stands for �ter in die� (in Latin, 3 times a day). q_h: If a medicine is to be taken every so-many hours, it is written �q_h�; the �q� standing for �quaque� and the �h� indicating the number of hours. So, for example, �2 caps q4h� means �Take 2 capsules every 4 hours.�

  • q.l.
    Abbreviation for L. quantum libet, as much as desired.
  • q.n.s.

    q.n.s.: On a lab report, q.n.s. (or qns or QNS) means Quantity Not Sufficient. Not enough blood, urine or whatever to do the test.

  • Q.R.
    Abbreviation for [L.] quantum rectum, however much is correct.
  • q.s.
    Abbreviation for L. quantum sufficiat or satis, as much as suffices.
  • q.v.
    Abbreviation for [L.] as much as you wish.
  • Q10
    Symbol for ubiquinone-10.
  • QALY

    QALY: Quality adjusted life year, a year of life adjusted for its quality or its value. A year in perfect health is considered equal to 1.0 QALY. The value of a year in ill health would be discounted. For example, a year bedridden might have a value equal to 0.5 QALY.

  • QBEND/10 (CD34)
  • QCO2
    Symbol for the microliters STPD of CO2 given off per milligram of tissue per hour.
  • QF
    Abbreviation for quality factor, the same as relative biologic effectiveness in radiation protection.
  • QH2
    Symbol for ubiquinol.
  • qinghaosu
    Chinese herbal used as an antimalarial, contains artemisinins as a major component.
  • QNB
    Abbreviation for quinuclidinyl benzilate.
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