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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
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. 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 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.2h.
On a prescription, every two hours.
q.3h.
On a prescription, every three hours.
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.
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.” 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.
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.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.s.
On a prescription, as needed.
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