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Factor V Leiden (rs6025 or F5 p.R506Q [1]) ... The gene that codes the protein is referred to as F5. Mutation of this gene—a single nucleotide polymorphism ...
14067 Ensembl ENSG00000198734 ENSMUSG00000026579 UniProt P12259 O88783 RefSeq (mRNA) NM_000130 NM_007976 RefSeq (protein) NP_000121 NP_032002 Location (UCSC) Chr 1: 169.51 – 169.59 Mb Chr 1: 163.98 – 164.05 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Coagulation factor V (Factor V), also less commonly known as proaccelerin or labile factor, is a protein involved in ...
[1] [5] This ratio is inversely related to the degree of APC resistance. [7] The ETP-based APC resistance test involves the addition of APC to a thrombin generation assay (TGA). [5] This results in an inhibition of thrombin generation as measured by reduction of the endogenous thrombin potential (ETP; area under the thrombin generation curve). [5]
The best known and most common hereditary form is Factor V Leiden, which is responsible for more than 95% of cases. [5] Other genetic causes include Factor V Cambridge (VThr306) and the factor V HR2 haplotype (A4070G mutation). [5] [6] Acquired forms of APC resistance occur in the presence of elevated Factor VIII concentrations.
In fact, Factor V Leiden is the most common cause of inherited thrombosis. [26] Heterozygous factor V Leiden is present in approximately 5% of the white population in the United States and homozygous factor V Leiden is found less than 1% of this population. [27]
The minor ("type 2") thrombophilias are much more common. Factor V Leiden is present in 5% of the population of Northern European descent, but much rarer in those of Asian or African extraction. In people with thrombosis, 10% have factor V Leiden. In those who are referred for thrombophilia testing, 30–50% have the defect.
There have also been cases in patients with other deficiency, including protein S deficiency, [6] [7] activated protein C resistance (Factor V Leiden) [8] and antithrombin III deficiency. [ 9 ] Although the above hypothesis is the most commonly accepted, others believe that it is a hypersensitivity reaction or a direct toxic effect.
The CPT code revisions in 2013 were part of a periodic five-year review of codes. Some psychotherapy codes changed numbers, for example 90806 changed to 90834 for individual psychotherapy of a similar duration. Add-on codes were created for the complexity of communication about procedures.