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Drugs and diseases reference index

Drugs and diseases reference index
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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «R»:

  1. Retrospective diagnosis Retrospective diagnosis
    Retrospective diagnosis: See: Retrodiagnosis....
  2. Retrospective study Retrospective study
    Retrospective study: In medicine, a study that looks backward in time, usually using medical records and interviews with patients who already known to have a disease....
  3. Retrosternal Retrosternal
    Retrosternal: Behind the sternum (the breastbone)....
  4. Retrovirus Retrovirus
    Retrovirus: An RNA virus (a virus composed not of DNA but of RNA). Retroviruses have an enzyme called reverse transcriptase that gives them the unique property of transcribing RNA (their RNA) into DNA. The retroviral DNA can then integrate into the chromosomal DNA of the host cell to be expressed...
  5. Rett syndrome Rett syndrome
    Rett syndrome: An X-linked dominant neurological disorder that affects girls only and is one of the most common causes of mental retardation in females. Girls with the syndrome show normal development during the first 6-18 months of life followed first by a period of stagnation and then by rapid reg...
  6. Reuptake Reuptake
    Reuptake: The reabsorption of a secreted substance by the cell that originally produced and secreted it. The process of reuptake, for example, affects serotonin. Serotonin is a neurotransmitter (a chemical messenger). It is produced by nerve cells in the brain and is used by nerves to communicate w...
  7. Reversal of organs, total Reversal of organs, total
    Reversal of organs, total: This condition (medically called situs inversus totalis) involves complete transposition (right to left reversal) of the thoracic and abdominal organs. The heart is not in its usual position in the left chest but is on the right. Specifically related to the heart, this is ...
  8. Reverse genetics Reverse genetics
    Reverse genetics: In classic genetics, the traditional approach was to find a gene product and then try to identify the gene itself. In molecular genetics, the reverse has been done by identifying genes purely on the basis of their position in the genome with no knowledge whatsoever of the gene pro...
  9. Reverse transcriptase Reverse transcriptase
    Reverse transcriptase: The enzyme that permits the human immunodeficiency virus (HIV) and other retroviruses to use their viral RNA as a template to make DNA. Reverse transcriptase is so-named because it reverses the usual transcription of DNA into RNA and allows RNA to be transcribed into DNA....
  10. Reverse transcriptase-polymerase chain reaction Reverse transcriptase-polymerase chain reaction
    Reverse transcriptase-polymerase chain reaction: Abbreviated RT-PCR. See: RT-PCR....
  11. Reye syndrome Reye syndrome
    Reye syndrome: A sudden, sometimes fatal, disease of the brain (encephalopathy) with degeneration of the liver, occurs in children (most cases 4-12 years of age), comes after the chickenpox (varicella) or an influenza-type illness, is also associated with taking medications containing aspirin. ...
  12. RF RF
    RF: Rheumatoid factor. Rheumatoid factor is an antibody that is measurable in the blood. It is commonly used as a blood test for the diagnosis of rheumatoid arthritis. Rheumatoid factor is present in about 80% of adults (but a much lower proportion of children) with rheumatoid arthritis. It is also...
  13. RFA RFA
    RFA: Radiofrequency ablation....
  14. RFID RFID
    RFID: Radio frequency identification, a system for remotely storing and retrieving data. RFID tags can serve to identify and track medications....
  15. RFLP RFLP
    RFLP: Restriction fragment length polymorphism. A difference in DNA between people that can be recognized by the use of a restriction enzyme....