Drawing blood samples
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Transcript of Drawing blood samples
Drawing blood samples
EHES Training Materials
Exclusion criteriaBlood samples are not taken, if participant
• Has a chronic illness which restricts taking blood samples
• Has anemia (Hb below 10 g/l)• Doubts about the blood volume to be taken• Refuses
Equipment • Blood sampling vacuum
tubes• Needle for vacuum tubes• Needleholder/adapter• Needle disposal container• Stasis• Disinfection solution,
swabs, gauze pads, skin tape
• Disposable gloves
Blood collection tubes• Serum evacuated
tubes containing gel or plain serum tubes (red cap)
• Fluoride-citrate plasma tube (grey cap)
• EDTA plasma tubes (violet cap)
Preparing for the blood collection
• Check participant’s ID code
• Place the code label on the form
• Record length of time from the last meal in full hours
• Participant rests 10-15 minutes
• Use gloves or disinfect hands
Posture of the subject• Sitting position, hand
downward, palm upwards• Before blood collection, ask
the participant to remove tight clothes that might constrict the upper arm
• If participant tells that he/she easily faints, supine posture due to safety of the participant
• Take blood from the arm not used for BP measurement • usually left arm
Protocol 1/8• Gently tap top of the
fluoride citrate plasma tube if it contains granules
• Release cover from the end of the needle and connect the holder and sample needle
• Apply tourniquet (if needed) to search a vein• Limit the use of the
tourniquet to less than one minute at a time
Protocol 2/8• Place the arm in a
downward position and disinfect the puncture site
• Remove the protector case from the needle
• Perform the venipuncture
Protocol 3/8• Collect blood first into
the 2 plain serum tubes
• Press the tube to puncture the stopper and start filling
• Loosen the tourniquet when the bloodstream runs
• Support the tube during filling
Protocol 4/8• When the bloodstream
stops, take the tube out of the holder
• Check that the tube is filled to the accurate volume
• Mix the plain serum tube 5 times by inverting the tube completely top-down immediately after taking the tube out of the holder
Protocol 5/8• Fill the fluoride-citrate
plasma tube• Immediately after
taking the fluoride-citrate tube out of the holder, mix 15 times by inverting the tube completely top-down
Protocol 6/8• Fill the 3 EDTA tubes • Mix the plain EDTA
tubes 5 times by inverting the tube completely top-down immediately after taking the tube out of the holder
• Store all tubes in a vertical position until sample handling
Protocol 7/8• Remove the needle
from the vein• Apply pressure
immediately on the puncture site with a gauze pad until bleeding stops
Protocol 8/8• Label the successfully
filled blood sampling tubes according to the sampling chart
• Discard needles into a needle dispose container and all other materials contaminated with blood into a biological waste container
RecordingRecord: • Deviations from the blood drawing protocol• Your initials/personnel code to identify who draw
the blood samples
Acknowledgements• Slides
• Laura Lund, Päivikki Koponen• Photographs
• Hanna Tolonen• Measurement demonstration
• Saara Vallivaara, Maarit Kajosaari