(M) Week 9: Special test for diagnosis of certain RBC membrane defects Flashcards
Tests can be used to classify anemia
a. CBC
b. ESR
C. PBS
d. a and b
e. a and c
e
An erythrocyte sedimentation rate (ESR) is a blood test that that can show if you have inflammation in your body
T or F
Polycythemia can also be detected using special hematology laboratory tests
t
test used to diagnose hereditary spherocytosis
Erythrocyte Osmotic Fragility test
a genetic membrane defect associated with deficiency or abnormal molecular structure of either the alpha or beta chain of spectrin
hereditary spherocytosis
What are the defective peripheral proteins associated with hereditary spherocytosis
ankyrin
protein band 3
protein band 4.2
characteristics of rbc membrane in hereditary spherocytosis
loose and fragile
RBC of patients with hereditary spherocytosis have this defect on its membrane
blebs
RBC blebs are removed by ________________ from the spleen , decreasing the red cell membrane which forms a small and _________ shaped red cell instead of a disc shaped
macrophages
sphere
Spherocytes have a low surface to area volume ratio, measuring <5um in diameter resulting to
(low/high) MCV
(low/high) MCHC
low MCV and high MCHC
which test principle is this?
subjecting the red cells into different concentration of salt starting from hypertonic solution (1.0% NaCl) or isotonic solution (0.90-0.85% NaCl) and identify at what salt concentration shows the initial and complete hemolysis
Erythrocyte osmotic fragility test
for hereditary spherocytosis
normal red cell _______________ at hypertonic solution
shrinks
normal red cell will _____________ in isotonic solution
will not lyse
normal red cell will ___________ at hypotonic solution
eventually lyse
a normal red cell without any defect on its membrane can withstand up to ___________ solution without lysis
0.5% NaCl hypotonic solution
partial hemolysis will only happen on _____________ of NaCl solution
0.40 -0.45%
hemolysis will only occur to normal rbc at ___________ NaCl solution
0.30 -0.35%
In hereditary spherocytosis, the red cells are lysed higher than _________ NaCl solution
0.5%
these are abnormal red cells that shares the same result with spherocytes if subjected to EOFT
elliptocytes
macrocytes
ovalocytes
(EMO, tore my life (hemolysis) into pieces this is my last desire ~)
What are the non lysing red cells in EOFT
hypochromic red cells
sickle cells
target cells / codocytes
(hay, so tibay)
hay = hypochromic red cells
so = sickle cells
tibay = target cells
In Manual EOFT procedure, what is the formula to get the concentration of the test tube?
Tube No. that showed partial/complete hemolysis x 0.02
o For example, Test Tube 21
o To get concentration of the test tube:
- IH: 21 x 0.02 = 0.42%