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
Hemorrhage into a joint
Hemarthrosis
Expectoration of blood from some part of the respiratory tract
Hemoptysis
Vomiting of blood
Hematemesis
Unusually heavy or prolonged menstrual periods
Menorrhagia
Passage of fresh blood per anus, usually in or with stools
Hematochezia
Passage of black tarry stools
Melena
Pathological formation of blood clots in veins or arteries
Thrombosis
Fibrinogen does not function normally or optimally
Dysfibrinogenemia
Constriction of damaged blood vessels ; formation of platelet clots
Primary hemostasis
Formation of fibrin mesh work thru activated coag factors ; inhibition of activated coag factors
Secondary hemostasis
