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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «H»:

  1. hCG hCG
    hCG: Human chorionic gonadotropin, a human hormone made by chorionic cells in the fetal part of the placenta. Human chorionic gonadotropin (hCG) is directed at the gonads and stimulates them. Hence, the name "gonadotropin." The presence of hCG is detectable by immunologic means within days of fert...
  2. HCM HCM
    HCM: Hypertrophic cardiomyopathy....
  3. Hct (hematocrit) Hct (hematocrit)
    Hct (hematocrit): Abbreviation for hematocrit. The hematocrit is the proportion, by volume, of the blood that consists of red blood cells. The hematocrit (hct) is expressed as a percentage. For example, an hematocrit of 25% means that there are 25 milliliters of red blood cells in 100 millilite...
  4. HCV HCV
    HCV: Hepatitis C virus....
  5. HDL HDL
    HDL: High density lipoprotein. Lipoproteins are combinations of lipids (fats) and proteins. They are the form in which lipids are transported in the blood. The high density lipoproteins transport cholesterol from the tissues of the body to the liver so it can be gotten rid of in the bile. HDL ch...
  6. HDL cholesterol HDL cholesterol
    HDL cholesterol: Lipoproteins, which are combinations of lipids (fats) and proteins, are the form in which lipids are transported in the blood. The high-density lipoproteins transport cholesterol from the tissues of the body to the liver so it can be gotten rid of (in the bile). HDL cholester...
  7. HDR syndrome HDR syndrome
    HDR syndrome: The syndrome of familial Hypoparathyroidism, sensorineural Deafness, and Renal dysplasia. Inherited as an autosomal dominant trait, the syndrome is caused by haploinsufficiency of the GATA3 gene in chromosome 10p. The hypoparathyroidism causes hypocalcemia (a low level of calcium in...
  8. HDV HDV
    HDV: Hepatitis D virus....
  9. Head and neck cancer Head and neck cancer
    Head and neck cancer: The common carcinomas of the oral cavity, pharynx, and larynx as well as other tumors that affect the head and neck. These include: Paranasal sinus and nasal cavity cancer Lip and oral cavity cancer Nasopharyngeal cancer Oropharyngeal cancer Hypopharyngeal cancer Laryngeal...
  10. Head bones Head bones
    Head bones: There are 29 bones in the human head. They consist of 8 cranial bones, 14 facial bones, the hyoid bone, and 6 auditory (ear) bones. The 8 cranial bones are the frontal, 2 parietal, occipital, 2 temporal, sphenoid, and ethmoid bones. The 14 facial bones are the 2 maxilla, mandible, 2 zy...
  11. Head injury Head injury
    Head injury: Damage to any of the structures of the head as a result of trauma. While the term "head injury" is most often used to refer to an injury to the brain, head injuries may also involve the bones, muscles, blood vessels, skin, and other organs of the face or head. A head injury...
  12. Head lice Head lice
    Head lice: Pediculus humanus capitis, parasitic insects found on the heads of people. Head lice are most often found on the scalp behind the ears and near the neckline at the back of the neck. The lice hold onto the hair with hook-like claws at the end of each of their six legs. Head lice are r...
  13. Head, optic nerve Head, optic nerve
    Head, optic nerve: The circular area in the back of the inside of the eye where the optic nerve connects to the retina....
  14. Headache Headache
    Headache: A pain in the head with the pain being above the eyes or the ears, behind the head (occipital), or in the back of the upper neck. Headache, like chest pain or back ache, has many causes. All headaches are considered primary headaches or secondary headaches. Primary headaches are not associ...
  15. Headache, alarm clock Headache, alarm clock
    Headache, alarm clock: See: Alarm clock headache....