Partial thromboplastin time
Common notation of coagulation times in medical records
Other namesActivated partial thromboplastin time; Activated partial prothrombin time; Activated partial thrombin time
MeSHD010314

The partial thromboplastin time (PTT), also known as the activated partial thromboplastin time (aPTT or APTT), is a blood test that characterizes coagulation of the blood. A historical name for this measure is the kaolin-cephalin clotting time (KCCT),[1] reflecting kaolin and cephalin as materials historically used in the test. Apart from detecting abnormalities in blood clotting,[2] partial thromboplastin time is also used to monitor the treatment effect of heparin, a widely prescribed drug that reduces blood's tendency to clot.

The PTT measures the overall speed at which blood clots form by means of two consecutive series of biochemical reactions known as the intrinsic pathway and common pathway of coagulation. The PTT indirectly measures action of the following coagulation factors: I (fibrinogen), II (prothrombin), V (proaccelerin), VIII (anti-hemophilic factor), X (Stuart–Prower factor), XI (plasma thromboplastin antecedent), and XII (Hageman factor).

The PTT is often used in conjunction with another measure of how quickly blood clotting takes place called the prothrombin time (PT). The PT measures the speed of clotting by means of the extrinsic pathway and common pathway.

Methodology

Blue Top Vacutainer tube (sodium citrate vial) used for PT and PTT blood tests

Partial thromboplastin time is typically analyzed by a medical technologist or a laboratory technician on an automated instrument at 37 °C (as a nominal approximation of normal human body temperature). The test is termed "partial" due to the absence of tissue factor from the reaction mixture.

  • Blood is drawn into a test tube containing oxalate or citrate, molecules which act as an anticoagulant by binding the calcium in a sample. The blood is mixed, then centrifuged to separate blood cells from plasma (as partial thromboplastin time is most commonly measured using blood plasma).
  • A sample of the plasma is extracted from the test tube and placed into a measuring test tube.
  • Next, an excess of calcium (in a phospholipid suspension) is mixed into the plasma sample (to reverse the anticoagulant effect of the oxalate enabling the blood to clot again).
  • Finally, in order to activate the intrinsic pathway of coagulation, an activator (such as silica, celite, kaolin, ellagic acid) is added, and the time the sample takes to clot is measured optically. Some laboratories use a mechanical measurement, which eliminates interferences from lipemic and icteric samples.

Interpretation

The typical reference range is between 25 seconds and 33 s (depending on laboratory). Longer times of up to 50 s do apply to infants. Shortening of the PTT is considered to have little clinical relevance, but some research indicates that it might increase risk of thromboembolism.[3] Normal PTT requires the presence of the following coagulation factors: I, II, V, VIII, IX, X, XI and XII. Notably, deficiencies in factors VII or XIII will not be detected with the PTT test.

Prolonged aPTT may indicate:

To distinguish the above causes, mixing tests are performed, in which the patient's plasma is mixed (initially at a 50:50 dilution) with normal plasma. If the abnormality does not disappear, the sample is said to contain an "inhibitor" (either heparin, antiphospholipid antibodies or coagulation factor specific inhibitors), while if it does disappear a factor deficiency is more likely. Deficiencies of factors VIII, IX, XI and XII and rarely von Willebrand factor (if causing a low factor VIII level) may lead to a prolonged aPTT correcting on mixing studies.

The aPTT is usually normal in pregnancy but tends to slightly decrease in late pregnancy.[4]

aPTT-based APC resistance test

The aPTT-based activated protein C (APC) resistance test is used in the diagnosis of APC resistance (APCR).[5] It involves a modified aPTT test performed in the presence and absence of APC.[5][6] The ratio of these aPTT values is calculated and is called the APC sensitivity ratio (APCsr) or simply APC ratio (APCr).[5][6] This ratio is inversely related to the degree of APC resistance.[7] The aPTT-based APC resistance test was developed in 1993.[6]

History

The PTT was first described in 1953 by researchers at the University of North Carolina at Chapel Hill.[8] This is the reason why the color of the Vacutainer tube top is Carolina blue.

See also

References

  1. ↑ "KCCT - General Practice Notebook". GP Notebook. Oxbridge Solutions Ltd. Retrieved 2010-06-08.
  2. ↑ "MedlinePlus Medical Encyclopedia: Partial thromboplastin time (PTT)". Retrieved 2009-01-01.
  3. ↑ Korte, Wolfgang; Clarke, Susan; Lefkowitz, Jerry B. (January 2000). "Short activated partial thromboplastin times are related to increased thrombin generation and an increased risk for thromboembolism". American Journal of Clinical Pathology. 113 (1): 123–7. doi:10.1309/G98J-ANA9-RMNC-XLYU. PMID 10631865. S2CID 37642249.
  4. ↑ Hellgren M (April 2003). "Hemostasis during normal pregnancy and puerperium". Semin Thromb Hemost. 29 (2): 125–30. doi:10.1055/s-2003-38897. PMID 12709915.
  5. 1 2 3 Amiral J, Vissac AM, Seghatchian J (December 2017). "Laboratory assessment of Activated Protein C Resistance/Factor V-Leiden and performance characteristics of a new quantitative assay". Transfus Apher Sci. 56 (6): 906–913. doi:10.1016/j.transci.2017.11.021. PMID 29162399.
  6. 1 2 3 Morimont L, Haguet H, Dogné JM, Gaspard U, Douxfils J (2021). "Combined Oral Contraceptives and Venous Thromboembolism: Review and Perspective to Mitigate the Risk". Front Endocrinol (Lausanne). 12: 769187. doi:10.3389/fendo.2021.769187. PMC 8697849. PMID 34956081.
  7. ↑ Clark P (February 2003). "Changes of hemostasis variables during pregnancy". Semin Vasc Med. 3 (1): 13–24. doi:10.1055/s-2003-38329. PMID 15199489.
  8. ↑ Langdell RD, Wagner RH, Brinkhous KM (1953). "Effect of antihemophilic factor on one-stage clotting tests; a presumptive test for hemophilia and a simple one-stage antihemophilic factor assy procedure". J. Lab. Clin. Med. 41 (4): 637–47. PMID 13045017.
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