INTRO TO HEMOSTATIS Flashcards
Maintenance of blood flow within the vascular system
Hemostasis
If the patient has many bruises or with a tendency to bleed, the phlebotomist should observe the site from ___ to ___ mins
1 to 5 minutes
Labile factors
Factors V and VIII
Cold temp (1 to 6 C) storage causes precipitation of
VWF
Cold temp (1 to 6 C) storage causes the activation of
Factor VIII
Cold temp (1 to 6 C) storage causes destruction of
Platelets
Anticoagulant of light blue top
3.2% buffered sodium citrate
Buffered sodium citrate may increase the stability of what factors
Factor V and VIII
Found in light blue top ; for coag tests and platelet factor 4 and beta-thromboglobulin assays
Citrate theophyline adenosine dipyridamole (CTAD)
Factors that may affect coag test results : SHORTENED RESULT (HEPEP)
Hemolysis
Excessive agitation
Prolonged tourniquet
Excessive needle manipulation
Platelet contamination
Factors that may affect coag test results : PROLONGED RESULT
Presence of clots
High anticoagulant concentration caused by short draw and elevated HCT (>55%)
Formula for the adjustment of AC volume
C= (1.85 x 10^-3) (100-H) x V
Needle and gauge : Adult with good veins, specimen less than or equal 25 mL
20 or 21 gauge ; 1.0 or 1.25 inches
Needle gauge and length: Adult with good veins, specimen greater than or equal 25 mL
19 gauge ; 1.0 or 1.25 inches
Needle gauge and length: child or adult with small, friable, or hardened veins
23 gauge, winged needle set, apply minimal negative pressure
Needle gauge and length: transfer of blood from syringe to tube
19 gauge ; slowly inject through tube closure
Storage temp for PT and PTT
18 to 24 C
Storage time for PT with no unfractionated heparin
24 hours
Storage time for PTT with no unfractionated heparin
4 hours
Storage time for PTT for monitoring UFH therapy and PT when UFH is present
Separate within 1 hr, test within 4 hrs
1 mm hemorrhage
Petechiae
3 mm hemorrhage
Purpura
1cm or greater hemorrhage
Ecchymosis / bruise
Medical term for nosebleed
Epistaxis
