introduction Flashcards
Hematology came from the Greek words
Haima - blood
logos - study
Respiratory pigment
Hemoglobin
gives color to the blood
functions of the blood
1) respiratory
2) nutritional
3) buffering action
4) excretion
5) maintenance of body temp
6) transport of hormones
vein diameter
5 mm
artery diameter
4mm
capillary diameter
8 um
smallest of blood vessels
capillary
largest of blood vessels
veins
most numerous of blood vessels
capillary
blood ph
7.35 to 7.45 (slightly alkaline)
arterial blood ph
7.45
venous blood ph
7.35
pulmonary vein blood color
BRIGHT RED
Pulmonary artery blood color
DARK PURPLISH RED
Arterial blood color
BRIGHT RED
Venous blood color
DARK PURPLISH RED
liquid portion of blood
SERUM: clotted
PLASMA: unclotted
Solid portion of blood aka
Hemocytes
-cellular elements
Red blood cells aka
Erythrocytes, Erythroplastids, akaryocytes
White blood cells
Leukocytes, Leukoplastids
WBC types
Granular (B,E,N)
Agranular (L,M)
Platelets aka
Thrombocytes, Thromboplastids
Gaseous portion of blood
Oxygen
Carbon dioxide
others
characteristics of blood:
- Fluid (in vivo)
- Red
- Slightly alkaline
- Average specific gravity of 1.055
- Thick and viscous (3.5 to 4.5 times thicker than water)
- Makes up 75 to 85 mL blood per kilogram body weight
- There are about 20 grams of solids per 100 mL of blood
most critical step in blood collection
Patient Identification
“moral sin” of phlebotomist
Mislabelling
identify the patient by asking his/her __
state and spell full name
age
gender
birthdate
Physiologic factors affecting test results:
Posture
Diurnal Rhythm
Stress
Exercise
increased levels affected by Posture
“PIC”
Protein
Cholesterol
Iron
Fluctuations in the values of certain analytes during a particular time of the day
Diurnal Rhythm
analytes affected in the morning
INCREASED: TSH, Iron, Cortisol
DECREASED: Eosinophil
Analyes affected in the afternoon
DECREASED: TSH, Iron, Cortisol
INCREASED: Eosinophil
Stress can increase these analytes
WBC Fibrinogen group (Factors I, V, VIII, XIII)
Exercise increases
Creatinine Total Protein Creatine Kinase Myoglobin AST HDL- chole LDH WBC count Platelet count
after a fatty meal, this can be falsely elevated
Hemoglobin
after a fatty meal, this can be elevated
ALP
Smoking causes WBC and Cortisol to ___
increase
Skin puncture is perfromed to these patients:
Newborns and pediatric patients Severely burned patients Patients whose veins are reserved for therapeutic purposes Extremely obese patients Elderly patients with fragile veins
Puncture sites for < 1 year old
Plantar surface of the foot
medial side, lateral side