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Topic: Hemoglobin F

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Hemoglobin

Sickle cell anaemia

Red blood cell

Capillary

Oxygen

	Fetal Hemoglobin (Hemoglobin F) Fact Sheet (Site not responding. Last check: 2007-10-25)
		Fetal hemoglobin (hemoglobin F) is the main hemoglobin that transports oxygen around the body of the developing baby during the last 7 months of pregnancy.
		Fetal hemoglobin is best suited to the conditions in the womb and the oxygen transport needs of babies still in their mothers' wombs.
		Hemoglobin F is made up of 2 alpha chains and 2 gamma (fetal) chains.
	www.fha.state.md.us /genetics/html/hemo_f.html (273 words)

	Hemoglobinopathies
		The genes for hemoglobin F and hemoglobin A are closely related, existing in the same gene cluster on chromosome 11.
		Hemoglobin C disease is relatively benign, producing a mild hemolytic anemia and splenomegaly.
		Hemoglobin is made of two subunits derived from genes in the alpha gene cluster on chromosome 16 and two subunits derived from genes in the beta gene cluster on chromosome 11.
	sickle.bwh.harvard.edu /hemoglobinopathy.html (1416 words)

	Georgia Division of Public Health
		Hemoglobin F (fetal hemoglobin) is the predominant hemoglobin before birth and normally a minor hemoglobin during adult life composing less than 1 percent of total hemoglobin.
		Hemoglobin E is a structurally abnormal hemoglobin caused by substitution of lysine for glutamic acid at the 26 position of the ß globin chain that has a ß+ thalassemia phenotype.
		Hemoglobins "D" There are a number of hemoglobins termed Hb D based on migration on hemoglobin electrophoresis.
	health.state.ga.us /programs/nsmscd/occasional.asp (3373 words)

	hemoglobin (Site not responding. Last check: 2007-10-25)
		Hemoglobin is the oxygen-carrying molecule of the red blood cells, which are essentially just tiny circulating bags of hemoglobin.
		After the first few months of life hemoglobin F is almost totally replaced by the normal adult type hemoglobin A. Certain diseases are characterised by abnormal hemoglobin types, for example sickle cell disease.
		In this disease, an abnormal molecule known as hemoglobin S causes severe effects of capillary blood vessel blockage; another variant, hemoglobin C is common as well and causes similar disease as classic hemoglobin S sickling, but this condition is not as severe.
	www.drhull.com /EncyMaster/H/hemoglobin.html (163 words)

	Sickle and other hemoglobins
		Hemoglobin F (fetal hemoglobin) is the predominant hemoglobin before birth and a normal minor hemoglobin during adult life composing less than 2 percent of total hemoglobin.
		Hemoglobin E is a structurally abnormal hemoglobin caused by substitution of lysine for glutamic acid at the 26 position of the B globin chain which has a B+ thalassemia phenotype.
		Hemoglobin Constant Spring (Hb CSpr) is an a chain variant with an elongated alpha globin chain of 28 to 31 amino acids.
	www.scinfo.org /hemoglb.htm (3166 words)

	Hemoglobin Electrophoresis - [Medical Test] - Quest Diagnostics Patient Health Library (Site not responding. Last check: 2007-10-25)
		A hemoglobin electrophoresis test is a blood test done to evaluate the different types of hemoglobin in the bloodstream.
		Hemoglobin F is replaced by hemoglobin A (adult hemoglobin) shortly after birth; only very small amounts of hemoglobin F are produced after birth.
		Hemoglobin S and hemoglobin C are the most common types of abnormal hemoglobins that may be identified by an electrophoresis test.
	www.questdiagnostics.com /kbase/topic/medtest/hw39098/descrip.htm (395 words)

	Fetal hemoglobin
		Fetal hemoglobin (also hemoglobin F or HbF) is the main oxygen transport protein in the fetus during the last seven months of development in the womb.
		Functionally, fetal hemoglobin differs most from adult hemoglobin in that it is able to bind oxygen with greater affinity than the adult form, giving the developing fetus better access to oxygen from the mother's bloodstream.
		Notably, the P50 value for fetal hemoglobin (i.e., the partial pressure of oxygen at which the protein is 50% saturated; lower values indicate greater affinity) is roughly 19 mmHg, whereas adult hemoglobin has a value of approximately 26.8 mmHg.
	www.mrsci.com /Hematology/Fetal_hemoglobin.php (564 words)

	Hemoglobinopathies and Thalassemias (Site not responding. Last check: 2007-10-25)
		The remainder of the hemoglobin is, of course, deoxygenated and is blue.
		The intracellular bodies that occur upon hemoglobin destabilization in SC disease are curious hybrids of the blunt-ended crystalloids of Hb C and the sharp-pointed tactoids of Hb S, in that they often have one pointed end and one blunt end, thus vaguely resembling arrowheads.
		Hemoglobin E should always be considered working up an unexplained microcytosis in a member of one of the affected ethnic groups.
	web2.iadfw.net /uthman/hemoglobinopathy/hemoglobinopathy.html (4522 words)

	Case Based Pediatrics Chapter
		Hemoglobin F (fetal hemoglobin) predominates in the normal newborn, and is completely replaced with hemoglobin A by 6 months of age.
		Hemoglobin F consists of 2 alpha globin chains and 2 gamma globin chains.
		Hemoglobin SC disease is typically associated with milder and less frequent vaso-occlusive events compared to sickle cell anemia.
	www.hawaii.edu /medicine/pediatrics/pedtext/s11c03.html (2645 words)

	Fetal Hemoglobin Test \| AHealthyMe.com
		Fetal hemoglobin (Hemoglobin F), Alkali-resistant hemoglobin, HBF (or Hb F), is the major hemoglobin component in the bloodstream of the fetus.
		The determination of fetal hemoglobin is an aid in evaluating low concentrations of hemoglobin in the blood (anemia), as well as the hereditary persistence of fetal hemoglobin, and a group of inherited disorders affecting hemoglobin, among which are the thalassemias and sickle cell anemia.
		At birth, the newborn's blood is comprised of 60%-90% of fetal hemoglobin.
	www.ahealthyme.com /topic/topic100586822 (592 words)

	Hemoglobin Electrophoresis
		and hemoglobin F may indicate a mild form of thalassemia; a very low level of hemoglobin A and a high level of hemoglobin F may indicate a more severe form of thalassemia.
		High levels of hemoglobin F may be seen in a rare condition called hereditary persistence of fetal hemoglobin.
		Hemoglobin E in low amounts indicates the presence of hemoglobin E trait.
	www.webmd.com /hw/lab_tests/hw39098.asp (1055 words)

	Hemoglobin Synthesis
		Although hemoglobin A is called "adult", it becomes the predominate hemoglobin within about 18 to 24 weeks of birth.
		Complex biophysical characteristics of the hemoglobin tetramer permit the exquisite control of oxygen uptake in the lungs and release in the tissues that is necessary to sustain life.
		The combination of two alpha genes and two beta genes comprises the normal adult hemoglobin, hemoglobin A. The delta gene, which is located between the gamma and beta genes on chromosome 11 produces a small amount of delta globin in children and adults.
	sickle.bwh.harvard.edu /hbsynthesis.html (1077 words)

	Hemoglobin Assays and Controls
		Because the amount of Hemoglobin H is rather low in heterozygous patients, ACS’s control is formulated with A, F, S and C and is rather out of balance with low (but detectable) H, markedly high A, and lower F, S and C values.
		Variant Hemoglobin Control, AD Although both hemoglobin D disease and trait hemoglobin AD are extremely rare, the importance of using controls is highlighted by the fact that hemoglobin S and hemoglobin D migrate similarly upon alkaline (pH 8.6) electrophoresis.
		The ACS Hemoglobin Assay is based on the ability of hemoglobin F to resist denaturation under alkaline conditions.
	www.analyticalcontrols.com /hemoglob.htm (1623 words)

	Thalassemia
		The Indecies are uniformly decreased with the MCV, MCH and MCHC decreased.
		Hemoglobin electrophoresis: Hgb F 80 to 90% Hgb A absent Hgb A2 absent Hgb Lepore 10%
		Hemoglobin E is a beta chain variant in which lysine is substituted for glutamic acid in position 26.
	www.cariboo.bc.ca /schs/medtech/rice/thalassemia.html (1994 words)

	Patient Education Reports - UMMC (Site not responding. Last check: 2007-10-25)
		Hemoglobin F (HbF) is a form of hemoglobin that exists in the fetus and small infants (and so is also called fetal hemoglobin.
		Fetal hemoglobin is able to block the sickling action of red blood cells so that infants with sickle-cell disease do not develop symptoms of the illness while they still have hemoglobin F. Adults who have sickle-cell disease but still retain high levels of hemoglobin F generally have mild disease.
		Continued monitoring of hemoglobin F has been recommended by some experts who believe that the drug should be discontinued if there is no increase in hemoglobin F within six months.
	www.umm.edu /patiented/doc58specifictreat.html (1791 words)

	Ask an Expert: Hemoglobinopathies-F Texas
		Hemoglobin is a protein in red blood cells that transports oxygen from the lungs to the tissues of the body.
		In normal adults, the structure of hemoglobin (Hb) is a tetramer composed of two alpha and two beta globin polypeptide chains.
		Hemoglobin F variants (such as the one you describe - Texas variant) may not cause any major health problems unless they are associated with one of the thalassemias or sickle cell disorders.
	www.netwellness.org /question.cfm/21864.htm (543 words)

	Nieuwe pagina 2
		Hemoglobin H represents an excess beta chain production and is a hemoglobin tetramer of beta chains.
		ACS’s Variant Hemoglobin Control, AFC is useful in confirming the presence of variant hemoglobin C in populations where C and E occur and in the presence of other hemoglobins such as elevated hemoglobin A
		ACS Quik-Sep® Hemoglobin F Assay is designed for accurate quantitation of adult hemoglobin F in ranges from 2% to 40% by alkali denaturation.
	www.aurora-borealis.nl /hemoglobin.htm (1683 words)

	Hemoglobin (Hgb), Fetal, Quantitative
		With erythroblastosis fetalis and anoxic states of the newborn, however, Hb F is proportionally lower than in a normal newborn.
		In the adult, hereditary persistence of fetal hemoglobin (HPFH) of multiple varieties is associated with varying elevations of Hb F. The homozygous form of HPFH is found only in fl individuals.
		In the heterozygous state, the Hb F level is 15% to 35% in the fl type, and 5% to 20% in the Greek type.
	www.labcorp.com /datasets/labcorp/html/chapter/mono/sc008300.htm (297 words)

	hemoglobin-F
		Hemoglobin is the red blood component that attaches itself to oxygen for distribution throughout the body.
		It normally switches from the HgF type, which is predominant in newborns, to hemoglobin-A, which is normally dominant in adults, within the first few months of life.
		The myth of the "overlaying mother" goes back at least to I Kings, in which one mother told King Solomon that another woman had killed her own baby: "This woman's son died in the night because she lay on it." But each of these early suspects has been exonerated.
	sids-network.org /experts/hemoglobinf.htm (977 words)

	Fetal hemoglobin - Wikipedia, the free encyclopedia
		Notably, the P50 value for fetal hemoglobin (i.e., the partial pressure of oxygen at which the protein is 50% saturated; lower values indicate greater affinity) is roughly 19 mmHg, whereas adult hemoglobin has a value of approximately 26.8 mmHg.
		When fetal hemoglobin production is switched off after birth, normal children begin producing hemoglobin B. But children with sickle-cell disease instead begin producing a long, slender form of hemoglobin called hemoglobin S.
		This variety of hemoglobin causes red blood cells to change their shape from round to sickle-shaped, which have a greater tendency to stack on top of one another and crowd blood vessels.
	en.wikipedia.org /wiki/Fetal_hemoglobin (765 words)

	NEJM -- Homozygous Hemoglobin C Disease
		Testing of the father, who was asymptomatic, revealed only hemoglobin C on electrophoresis and a complete blood count similar to that of the child.
		Homozygous hemoglobin C disease is generally a benign condition associated with mild hemolytic anemia and splenomegaly.
		In terms of geographic distribution, the hemoglobin C allele is found at the highest frequencies in West Africa, where it has been associated with protection against malaria.
	content.nejm.org /cgi/content/full/350/26/e24 (235 words)

	Distribution of Hemoglobin F, A, S, C, E, and D Quantities in 4 Million Newborn Screening Specimens -- Eastman et al. ...
		for Hbs F and A, the chromatograms have a ratio <0.5.
		Quantitation of hemoglobin components by high-performance cation-exchange liquid chromatography: its use in diagnosis and in the assessment of cellular distribution of hemoglobin variants.
		Percentages of abnormal hemoglobins in adults with a heterozygosity for an
	www.clinchem.org /cgi/content/full/45/5/683 (1387 words)

	Hemoglobin - Wikipedia, the free encyclopedia
		Hemoglobin or haemoglobin [frequently abbreviated as Hb or Hgb] is the iron-containing oxygen-transport metalloprotein in the red cells of the blood in mammals and other animals.
		Hemoglobin (Hb) is synthesized in the mitochondria of the immature red blood cell throughout its early development from the proerythroblast to the reticulocyte in the bone marrow.
		Single-globin hemoglobins tend to be found in primitive species such as bacteria, protozoa, algae, and plants.
	en.wikipedia.org /wiki/Hemoglobin (3716 words)

	Hemoglobin electrophoresis
		Hemoglobin electrophoresis is a test that is performed to measure the different types of hemoglobin in a person’s blood.
		In this form of electrophoresis, the hemoglobin particles are placed in an electric field.
		Because of their varying electrical charges, when placed in this electric field, the hemoglobin particles will move and separate according to their specific types and form “bands.” A comparison of these bands to a normal blood sample will assist in diagnosing whether or not the person suffers from a disorder like sickle cell anemia.
	www.sebia-usa.com /siteMap/hemoglobin.html (294 words)

	Northern California's Comprehensive Thalassemia Center at at Children's Hospital Oakland
		Hemoglobin electrophoresis with quantitative hemoglobin A2 and hemoglobin F
		Individuals with alpha thalassemia trait usually have evidence of microcytosis and normal levels of hemoglobin A2 and F. Sometimes trait status cannot be determined by these screening tests alone.
		Depending on the hemoglobin type of a current or future partner, future children may be at risk for thalassemia disease or other related hemoglobin diseases.
	www.thalassemia.com /gene_test.html (426 words)

	Time-dependent Changes in the Density and Hemoglobin F Content of Biotin-Labeled Sickle Cells -- Franco et al. 101 ...
		The percentage of F cells was determined in four patients (S4-S7) by flow cytometry (21).
		The studies with HbF and F cells are the first quantitation of the effect of this hemoglobin on the survival characteristics
		Barker-Gear, M.A. Miller, S.M. Williams, C.H. Joiner, and D.L. Rucknagel (1994) Fetal hemoglobin and potassium in isolated transferrin receptor-positive dense sickle reticulocytes.
	www.jci.org /cgi/content/full/101/12/2730 (6156 words)

	Inside WSU
		Hemoglobin is the red blood cell component that carries oxygen throughout the body.
		During the first few weeks of life that level declines and is replaced by hemoglobin-A. By the time a baby is 3 months old, hemoglobin-F should have declined to an adult level, Cochran said.
		“When in utero, hemoglobin with a high oxygen affinity is needed in order to get the oxygen from the mother to the baby,” Cochran said.
	www.wichita.edu /insidewsu/2-12-99/research.htm (888 words)

	Medical Dictionary: Hemoglobin F - WrongDiagnosis.com
		Hemoglobin F : fetal hemoglobin; major component of hemoglobin in the fetus; it has two alpha and two gamma polypeptide subunits in comparison to normal adult hemoglobin, which has two alpha and two beta polypeptide subunits.
		Terms associated with Hemoglobin F: Broader terms for Hemoglobin F
		The term Hemoglobin F can be used for:
	www.wrongdiagnosis.com /medical/hemoglobin_f.htm (209 words)

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