Abstract
Background: Gestational age-specific reference values are essential for the accurate interpretation of haemostatic tests during pregnancy.
Methods: Our 1-year prospective study included 40 healthy pregnant women with a median age of 30 (range 22–40) years; the subjects were followed in order to establish the gestational age dependent values for endogenous thrombin potential (ETP), D-dimer and protein S (activity and free).
Results: During the first trimester 50% of studied women had ETP >100% (reference values out of pregnancy); in the second trimester an ETP over 100% was observed in all women; ETP values remained unchanged during the third trimester. In the first trimester, the median D-dimer concentration of 0.30 mg/L, in the second 0.91 mg/L and in the third of 1.45 mg/L were observed. During the first trimester 14/40 subjects had protein S activity below reference range (<59%, out of pregnancy); the median value of 61.35; interquartile range (IQR) 20.38; in the second 21/37; the median value of 53.1 (IQR 15.65); in the third trimester 28/37 had low level of protein S activity with the median value of 49.0 (IQR 18.8). Free protein S showed a slight decrease from the first trimester; it remained almost stable during the rest of pregnancy, with the equal number of pregnant women with reduced free protein S.
Conclusions: Related to the gestational age, a significant increase of ETP and D-dimer, from the second trimester was observed; the decrease of protein S was observed already from the early pregnancy, with more pronounced variability of protein S activity.
Acknowledgments:
This work was supported by grant 173008 from the Ministry of Education, Science and Technological Development, Serbia.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Financial support: None declared.
Employment or leadership: None declared.
Honorarium: None declared.
Competing interests: The funding organisation(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.
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©2015 by De Gruyter
Articles in the same Issue
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- Editorial
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- Review
- Discriminant indices for distinguishing thalassemia and iron deficiency in patients with microcytic anemia: a meta-analysis
- Mini Reviews
- Cell-free DNA for diagnosing myocardial infarction: not ready for prime time
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- Opinion Papers
- Theranos phenomenon − part 2
- Considerations in parathyroid hormone testing
- Quantity quotient reporting. Comparison of various models
- Genetics and Molecular Diagnostics
- Assessing quality and functionality of DNA isolated from FFPE tissues through external quality assessment in tissue banks
- Influence of storage conditions and extraction methods on the quantity and quality of circulating cell-free DNA (ccfDNA): the SPIDIA-DNAplas External Quality Assessment experience
- Non-invasive fetal ABO genotyping in maternal plasma using real-time PCR
- Screening non-deletion α-thalassaemia mutations in the HBA1 and HBA2 genes by high-resolution melting analysis
- General Clinical Chemistry and Laboratory Medicine
- European views on patients directly obtaining their laboratory test results
- Diagnostic performances of clinical laboratory tests using Triton X-100 to reduce the biohazard associated with routine testing of Ebola virus-infected patients
- Thrombin generation, D-dimer and protein S in uncomplicated pregnancy
- Multi-analyte analysis of non-vitamin K antagonist oral anticoagulants in human plasma using tandem mass spectrometry
- Second generation analysis of antinuclear antibody (ANA) by combination of screening and confirmatory testing
- Faecal leukocyte esterase activity is an alternative biomarker in inflammatory bowel disease
- Reference Values and Biological Variations
- Total folate and 5-methyltetrahydrofolate in the cerebrospinal fluid of children: correlation and reference values
- Effect of age and gender on reference intervals of red blood cell distribution width (RDW) and mean red cell volume (MCV)
- Infectious Diseases
- Inosine triphosphate pyrophosphohydrolase activity: more accurate predictor for ribavirin-induced anemia in hepatitis C infected patients than ITPA genotype
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- Letter to the Editors
- Misleading high-sensitivity troponin algorithm for NSTEMI in the ESC guidelines
- Adjustment of serum potassium for age and platelet count. A simple step forward towards personalized medicine
- The impact of Tween 20 on repeatability of amyloid β and tau measurements in cerebrospinal fluid
- Effect of storage time and temperature on the generation of reactive oxygen species in peripheral blood leukocytes
- Iohexol interference in the α2-globulin fraction of the serum protein capillary electrophoresis
- A functional variant in the γ-glutamyltransferase (GGT)1 gene is associated with airflow obstruction in smokers
- Comparison of measured venous carbon dioxide and calculated arterial bicarbonates according to the PaCO2 and PaO2 cut-off values of obesity hypoventilation syndrome
- Creatinine, Jaffe, and glucose: another inconvenient truth
- Analytical evaluation of a new liquid immunoturbidimetric assay for the determination of ferritin in serum
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Articles in the same Issue
- Frontmatter
- Editorial
- Biomarkers of inflammatory bowel disease: ready for prime time?
- Review
- Discriminant indices for distinguishing thalassemia and iron deficiency in patients with microcytic anemia: a meta-analysis
- Mini Reviews
- Cell-free DNA for diagnosing myocardial infarction: not ready for prime time
- The Laboratory Medicine and the care of patients infected by the Ebola virus. Experience in a reference hospital of Madrid, Spain
- Opinion Papers
- Theranos phenomenon − part 2
- Considerations in parathyroid hormone testing
- Quantity quotient reporting. Comparison of various models
- Genetics and Molecular Diagnostics
- Assessing quality and functionality of DNA isolated from FFPE tissues through external quality assessment in tissue banks
- Influence of storage conditions and extraction methods on the quantity and quality of circulating cell-free DNA (ccfDNA): the SPIDIA-DNAplas External Quality Assessment experience
- Non-invasive fetal ABO genotyping in maternal plasma using real-time PCR
- Screening non-deletion α-thalassaemia mutations in the HBA1 and HBA2 genes by high-resolution melting analysis
- General Clinical Chemistry and Laboratory Medicine
- European views on patients directly obtaining their laboratory test results
- Diagnostic performances of clinical laboratory tests using Triton X-100 to reduce the biohazard associated with routine testing of Ebola virus-infected patients
- Thrombin generation, D-dimer and protein S in uncomplicated pregnancy
- Multi-analyte analysis of non-vitamin K antagonist oral anticoagulants in human plasma using tandem mass spectrometry
- Second generation analysis of antinuclear antibody (ANA) by combination of screening and confirmatory testing
- Faecal leukocyte esterase activity is an alternative biomarker in inflammatory bowel disease
- Reference Values and Biological Variations
- Total folate and 5-methyltetrahydrofolate in the cerebrospinal fluid of children: correlation and reference values
- Effect of age and gender on reference intervals of red blood cell distribution width (RDW) and mean red cell volume (MCV)
- Infectious Diseases
- Inosine triphosphate pyrophosphohydrolase activity: more accurate predictor for ribavirin-induced anemia in hepatitis C infected patients than ITPA genotype
- The ratio of calprotectin to total protein as a diagnostic and prognostic marker for spontaneous bacterial peritonitis in patients with liver cirrhosis and ascites
- Letter to the Editors
- Misleading high-sensitivity troponin algorithm for NSTEMI in the ESC guidelines
- Adjustment of serum potassium for age and platelet count. A simple step forward towards personalized medicine
- The impact of Tween 20 on repeatability of amyloid β and tau measurements in cerebrospinal fluid
- Effect of storage time and temperature on the generation of reactive oxygen species in peripheral blood leukocytes
- Iohexol interference in the α2-globulin fraction of the serum protein capillary electrophoresis
- A functional variant in the γ-glutamyltransferase (GGT)1 gene is associated with airflow obstruction in smokers
- Comparison of measured venous carbon dioxide and calculated arterial bicarbonates according to the PaCO2 and PaO2 cut-off values of obesity hypoventilation syndrome
- Creatinine, Jaffe, and glucose: another inconvenient truth
- Analytical evaluation of a new liquid immunoturbidimetric assay for the determination of ferritin in serum
- Analytical assessment of the novel homocysteine liquid enzymatic assay on Beckman Coulter AU5800
- Immunoglobulin IgA, IgD, IgG, IgM and IgG subclass reference values in adults