ESR Flashcards
Refers to the speed of the settling of RBCs in Anticoagulated Blood
Erythrocyte Sedimentation Rate
ESR measures what? (2)
- Distance
- Speed of Fall of RBCs
Most important factor influencing ESR
Plasma Proteins
3 Stages of ESR
- Initial Period of Aggregation / Rouleaux Formation
- Period of Fast Settling
- Final Period of Packing
Time for the First Stage of ESR
First 10 Mins
Time for the Second Stage of ESR?
40 Mins
Time for the final stage of ESR?
Last 10 mins
ESR indirectly measures?
Inflammation
2 Importance of ESR
- Index of Presence of Active Infection
- Measure Suspension stability of RBCs
ESR Indicates abnormal Concentrations of? (3)
- Fibrinogen
- Globulin
- Plasma Proteins
2 Methods of ESR Determination
- Wintrobe-Landsberg Method
- Westergren Method
A quite accurate method for ESR Determination
Wintrobe - Landsberg Method
How long do you have to stand the Tubes for ESR Determination?
1 Hour / 60 Mins
Normal value of Male in Wintrobe Method?
0-10 mm/hr
Normal Value of Females in Wintrobe Method?
0-20 mm/hr
0-10 / Red Calibration mark in Wintrobe is used for?
ESR
10-0 / White Calibration mark of Wintrobe Tube is used for?
Hematocrit Determination
Most sensitive method for ESR Determination?
Westergren Method
Can be used for serial studies of Chronic Diseases such as Tuberculosis/Carcinoma?
Westergren Method
Normal value of Male in Westergren Method?
0-15 mm/hr
Normal Value of Female in Westergren Method?
0-17 mm/hr
Length of Westergren Tube
30 cm
Length of Wintrobe Tube
11.5 cm
Difference Between Westergren and Wintrobe in terms of Bottom of Tube
Westergren: Open
Wintrobe: Flat & Closed
Anticoagulant of Choice for Westergren?
3.8% Trisodium Citrate
Calibration for Wintrobe?
0-100mm
Anticoagulant of Choice for Wintrobe Method?
Hellen & Paul’s Double Oxalate
Calibration for Westergren Method?
0-200 mm
Disadvantage of Wintrobe Method?
Less Sensitive
Give at least 5 Clinical Significance of an Increased ESR
- Rheumatoid Arthritis
- Pregnancy
- Bacterial Infection
- Malignancy
- Tissue Damage
- Multiple Myeloma
- Waldenstrom Macroglobulinemia
- Severe Anemia
Give the 4 Clinical Significance of a Normal to Decreased ESR
- Polycythemia
- Sickle Cell Anemia
- Spherocytosis/Poikilocytosis
- Increase Viscosity
3 Sources of Error for Falsely Increased ESR
- Tilted column
- Hemolysis
- Increased room temp
3 Sources of Error for Falsely Decreased Results
- Clotted
- Excess Anticoagulant
- Old Blood