Investigation Name:Activated Partial Thromboplastin Time (APTT)

Alias or Abbreviation:APTT

Pathology Laboratory:Haematology Laboratory

Requestable Seperately?No

Part of Profile:Coagulation Screen

Tests in Profile:PT,INR, APTT and Fibrinogen

E-Requesting Tab:BASIC-Blds

Lower Reference Range Limit:25

Upper Reference Range Limit:35

Units:seconds

Minimum Sample Volume:3ml

Expected Turnaround Time:< 4 hours

Test Code:APTTH

Sample Type:

Maximum Add on Time:8 hours

Complex Reference Range:If patient is on heparin then a heparin ratio will be reported. Heparin Ratio range for patients is 1.5-2.5. Age specific paediatric/neonatal reference range :- Premature (24-29 weeks - Day 1) APTT 40.6 - 101 seconds Premature (30-36 weeks - Day 1) APTT 27.5 - 79.4 seconds Premature (30-36 weeks - Day 30) APTT 26.9 - 62.5 seconds Full term (37-40 weeks - Day 1) APTT 31.3 - 54.5 seconds Full term (37-40 weeks - Day 5) APTT 25.4 - 59.8 seconds

Collection Conditions / Other Information:Full sample should be tested within 4 hours of specimen collection.. Please contact the haematology laboratory for any Urgent requests Paediatric sample tubes are available from the laboratory for children and difficult to bleed patients. These tubes require 1ml of blood to be taken. Underfilled or overfilled samples will not be processed as the ratio of anticoagulant to blood in the tube will be incorrect. Clotted and grossly haemolysed samples cannot be processed. Haemolysis, Icterus and lipaemia may interfere with testing and so manual methods may be required to gain results.

Referred to Another Laboratory?No