| Autor: |
Meyer, Todd, Garcia, Maria, Helms, Elizabeth, Francis, Deborah A., Francis, John L. |
| Předmět: |
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| Zdroj: |
Clinical & Applied Thrombosis/Hemostasis; Apr1997, Vol. 3 Issue 2, p99-101, 3p, 2 Graphs |
| Abstrakt: |
Activated protein C resistance (APCR) is the single most common cause of hereditary thrombophilia and is caused by a mutation in the factor V molecule (FV Leiden). Screening for this defect has become a standard part of the laboratory evaluation of thrombophilia. However, the original APTT-based screening test does not discriminate completely between normal individuals and heterozygotes for FV Leiden. Diluting the patient's plasma in factor V-deficient plasma greatly improves the predictive ability of this test for the FV Leiden mutation. In this report we show that a heterozygote for FV Leiden (confirmed by DNA analysis) showed marked temporal variation in APCR ratio when tested by the original coagulation-based technique. Specifically, this individual tested normal in five of seven occasions tested (APCR ratio range 1.98-2.53; normal >2.0). Using the modified method, although some temporal variation remained, the diagnosis of APCR would have been made on every occasion (APCR ratio 1.85-2.12; normal >2.3). These findings constitute a further reason to use the modified procedure for APCR screening. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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