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flu·id

(flū'id),
1. A nonsolid substance (that is, liquid or gas) that tends to flow or conform to the shape of the container in which it is kept.
2. Consisting of particles or distinct entities that can readily change their relative positions, that is, tending to move or capable of flowing.
[L. fluidus, fr. fluo, to flow]

fluid

A liquid or gas which conforms to the shape of its container. See Body fluid, Cerebrospinal fluid, Pericardial fluid.

flu·id

(flū'id)
1. A nonsolid substance, such as a liquid or gas, which tends to flow or conform to the shape of the container.
2. Consisting of particles or distinct entities that can readily change their relative positions; tending to move or capable of flowing.
[L. fluidus, fr. fluo, to flow]

fluid

(floo'id) [L. fluidus, flowing]
A nonsolid, liquid, or gaseous substance. See: secretion

allantoic fluid

Fluid found in the fetal membrane that develops from the yolk sac.

amniotic fluid

A clear fluid that surrounds the fetus in the amniotic sac. Its primary functions are to suspend and protect the growing fetus, allow freedom of movement, maintain even constant temperature, and aid normal development of the fetal lungs. Volume increases from about 50 ml at 12 gestational weeks to around 800 ml at 38 weeks. The fluid is constantly being circulated by the fetus swallowing fluid, urinating, and inhaling/exhaling fluid during fetal respiration. Samples of amniotic fluid may be collected by amniocentesis to identify fetal chromosomal abnormalities, state of health, and maturity. Synonym: liquor amnii.
See: amniocentesis; oligohydramnios; polyhydramnios

ascitic fluid

Clear, pale, straw-colored fluid occurring in ascites. The fluid is normally sterile; its specific gravity is normally 1.005 to 1.015; the cellular content is less than 250 white blood cells per cubic millimeter, and its protein content is low. Cancer, heart failure, liver failure, peritonitis, and tuberculosis may alter the amount or character of ascites.

body fluid

A fluid found in one of the fluid compartments of the body. The principal fluid compartments are intracellular and extracellular. A much smaller segment, the transcellular, includes fluid in the tracheobronchial tree, the gastrointestinal tract, and the bladder; cerebrospinal fluid; and the aqueous humor of the eye. The chemical composition of fluids in the various compartments is carefully regulated. In a normal 154 lb (70 kg) adult human male, 60% of total body weight (i.e., 42 L) is water; in a normal adult female is 55% of total body weight is water (39 L).
See: acid-base balance; fluid replacement; fluid balance

Bouin fluid

See: Bouin fluid
Enlarge picture
FLOW OF CEREBROSPINAL FLUID THROUGH THE BRAIN AND SPINAL COLUMN: Formation, circulation, and reabsorption of CSF

cerebrospinal fluid

Abbreviation: CSF
The sodium-rich, potassium-poor tissue fluid of the brain and spinal cord. The fluid supplies nutrients and removes waste products; it is also a watery cushion that absorbs mechanical shock to the central nervous system. Synonym: spinal fluid See: lumbar puncture

Formation

The fluid is formed by the choroid plexuses of the lateral and third ventricles. That of the lateral ventricles passes through the foramen of Monro to the third ventricle, and through the aqueduct of Sylvius to the fourth ventricle. There it may escape through the central foramen of Magendie or the lateral foramina of Luschke into the cisterna magna and to the cranial and spinal subarachnoid spaces. It is reabsorbed through the arachnoid villi into the blood in the cranial venous sinuses, and through the perineural lymph spaces of both the brain and the cord. See: illustration

Characteristics

The fluid is normally watery, clear, colorless, and almost entirely free of cells. The initial pressure of spinal fluid in a side-lying adult is about 100 to 180 mm of water. On average, the total protein is about 15 to 50 mg/dL, and the concentration of glucose is about twothirds the concentration of glucose in the patient's serum. Its pH, which is rarely measured clinically, is slightly more acidic than the pH of blood. Its concentration and alkaline reserve are similar to those of blood. It does not clot on standing. Turbidity suggests an excessively high number of cells in the fluid, typically white blood cells in infections such as meningitis or red blood cells in intracerebral hemorrhage.

CSF may appear red following a recent subarachnoid hemorrhage or when the lumbar puncture that obtained the CSF caused traumatic injury to the dura that surround the fluid. Centrifugation of the fluid can distinguish between these two sources of blood in the spinal fluid: the supernatant is usually stained yellow (xanthochromic) only when there has been a recent subarachnoid hemorrhage.

Many conditions may cause increases in CSF total protein: infections, such as acute or chronic meningitis; multiple sclerosis (when oligoclonal protein bands are present); Guillain-Barré syndrome; and chronic medical conditions like cirrhosis and hypothyroidism (when diffuse hypergammaglobulinemia is present). The concentration of glucose in the CSF rises in uncontrolled diabetes mellitus and drops precipitously in meningitis, sarcoidosis, and some other illnesses. Malignant cells in the CSF, demonstrated after centrifugation or filtering, are hallmarks of carcinomatous meningitis.

Microorganisms

The CSF is normally sterile. Meningococci, streptococci, Haemophilus influenzae, Listeria monocytogenes, and gram-negative bacilli are recovered from the CSF only in cases of meningitis. Syphilitic meningitis is usually diagnosed with serological tests for the disease, such as the venereal disease research laboratory (VDRL) test, the rapid plasma reagin (RPR) test, or the fluorescent treponemal antibody test. Cryptococcal infection of the CSF may be demonstrated by India ink preparations, or by latex agglutination tests. Tuberculous meningitis may sometimes be diagnosed with Ziehl-Neelsen stains, but more often this is done with cultures. These last three infections (syphilis, cryptococcosis, and tuberculosis) are much more common in patients who have acquired immunodeficiency syndrome (AIDS) than in the general population.

illustration

crevicular fluid

Gingival sulcular fluid.

extracellular fluid

The body fluid outside of cells. It includes the interstitial, intravascular, and cerebrospinal fluids. Water is the common solvent of all these fluids. Approximately 36% of an adult's body fluids and 47% of and infant's body fluids are extracellular.

extravascular fluid

Interstitial fluid.

follicular fluid

The liquid rich in heparin sulfate, hyaluronic acid, anti-müullerian hormone, defensins, and other chemicals that surrounds developing oocytes as they mature in the ovary.

gingival fluid

Gingival sulcular fluid.

gingival sulcular fluid

Abbreviation: GSF
In dentistry, the fluid that seeps through the gingival epithelium. It increases with gingival inflammation. Cellular elements within GSF include bacteria, desquamated epithelial cells, and leukocytes. Electrolytes and some organic compounds are also present. Synonym: crevicular fluid; gingival fluid

interstitial fluid

Water and dissolved substances inside tissues but outside of cells and vessels. Interstitial fluid is largely the ultrafiltrate of arterial blood, having been pushed through capillary walls by hydrostatic force; therefore it has a salt concentration similar to blood serum. Normally, approximately 29% of an adult's body fluids and 40% of an infant's body fluids are interstitial fluids. Excess interstitial fluid is returned to the circulation by the lymphatics. An accumulation of excess interstitial fluid is called edema.
Synonym: extravascular fluid

intracellular fluid

Abbreviation: ICF
The potassium-rich, sodium-poor watery solution inside cells. Approx. 55 to75% of total body water is intracellular.

intraocular fluid

Fluid within the anterior and posterior chambers of the eye. Synonym: aqueous humor

intravascular fluid

That portion of the total body fluid contained within blood and lymphatic vessels.

peritoneal fluid

The clear straw-colored serous fluid secreted by the cells of the peritoneum. The few milliliters present in the peritoneal cavity moisten the surfaces of the two peritoneal layers and allow them to glide over each other as the intestinal tract changes shape during the process of digestion and absorption. In certain disease states (such as right-sided heart failure, cirrhosis, or ovarian malignancy) the amount of peritoneal fluid is increased.
See: ascites

pleural fluid

Fluid secreted by serous membranes in the pleurae that reduces friction during respiratory movements of the lungs. When excessive pleural fluid is secreted and not absorbed, a pleural effusion accumulates.

Scarpa fluid

See: Scarpa, Antonio

seminal fluid

Semen.

serous fluid

Fluid secreted by serous membranes that reduces friction in the serous cavities (pleural, pericardial, and peritoneal).

spinal fluid

Cerebrospinal fluid

synovial fluid

Clear viscid lubricating fluid of the joint, bursae, and tendon sheaths, secreted by the synovial membrane of a joint. It contains mucin, albumin, fat, and electrolytes.
Synonym: synovia See: synovial joint

transcellular fluid

The extracellular fluid that lubricates the potential spaces of the body, such as the pleura and pericardium.

Zenker fluid

See: Zenker, Friedrich Albert von

flu·id

(flū'id)
A nonsolid substance (i.e., liquid or gas) that tends to flow or conform to the shape of the container in which it is kept.
[L. fluidus, fr. fluo, to flow]

Patient discussion about fluid

Q. What causes fluid to leak from the legs?

A. It may be caused by chronic venous insufficiency - when the veins of your leg are not competent enough to drain the blood from the legs. It causes accumulation of blood in your legs, and the elevated pressure of the blood causes the water in the blood to leak out of the blood vessels.

You may read more here: www.nlm.nih.gov/medlineplus/ency/article/000203.htm

More discussions about fluid
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