LB10 Flashcards
can be performed bedside or can be performed comfortably anywhere the patient is
Point of Care Testing
other names for POCT
alternate site testing, ancillary, bedside, near-patient
most common term for POCT
bedside
laboratory instrumentation used for POCT
small, portable, often handheld
advantages of POCT
- convenience
- short turnaround time for results
disadavantages of POCT
- not consistent
- results are sensitive/specific
- limitations to specificity, sensitivity, accuracy and precision
where are test systems cleared
FDA
include test systems cleared by the FDA for home use
CLIA Waived Tests
tests used to diagnose and monitor cardiovascular disease
Cardiac Troponin T and Troponin I
tests for coagulation testing
ACT, PT, APTT
checks glucose using capillary blood
Glucometer
electrochemical strip with enzyme electrode containing glucose oxidase or dehydrogenase
Glucometer
useful in blood donation drives
Hemoglobinometer
compares color of light passing through a hemolyzed blood with a standard
Hemoglobinometer
requires capillary blood
Strip tests
tests that require strip tests
pregnancy test, malaria test, strip tests for hepatitis B, hepatitis C, and HIV I, HIV II
values that are well outside the range of normal
panic values
time required for blood to stop flowing from a standardized puncture on the inner surface of the forearm
Bleeding Time
where is BT test performed
volar (inner) lateral surface of the forearm
used to standardize and maintain constant pressure
blood pressure cuff
made with a sterile automated incision device
incision
interfere with interpretation of the test by prolonging bleeding time
Salicylates
site for BT test
volar forearm approximately 5 cm distal to the antecubital area and devoid of surface veins, scars, bruises or edema
seconds for blotting for BT
30 seconds
when will you stop bringing the filter paper to the incision
when blood no longer stains the filter paper
difference of ivy’s method and duke’s method
Ivy’s method - uses a blood pressure cuff
Duke’s method - uses a lancet and makes a puncture
normal value for ivy’s method
2-8 minutes
normal value for duke’s method
2-5 minutes
Factors that increase bleeding time
- any disturbance of platelet plug formation
- BP above 40 mmHg
- too much pressure on incision device
Factors that decrease bleeding time
- failure to start the timing as soon as incision is made
- too much little pressure on incision device
- BP below 40 mmHg
most effective method for clotting time
Lee and White Method
temperature of water bath during Lee and White Method
37C
normal value for lee and white method
5-15 minutes
most convenient for clotting time
Drop or Slide
uses the tip of a lancet across drop of blood until fibrin threads cling to strip
Drop or Slide
normal value for drop and slide
2-4 minutes
