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 اسئله واجابات مهمة

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عدد الرسائل : 144
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تاريخ التسجيل : 27/02/2008

مُساهمةموضوع: اسئله واجابات مهمة   الأربعاء مارس 05, 2008 8:10 am

the method of hemoglobin measuerement requires the conversion of hemoglobin to


--- cyanmethemoglobin ---


which of the following will result in afalsely decreased erythrocyte sedimmentation rate
---
presence of codocytes


the " rule of three means that theHCT is
three times the HB


After staining aperipheral blood smear with wright'stain and a buffer with correct pH the RBC's appear pale pink and the WBC's stian very weakly with little - to- no nuclear deatail One possible explanation is


There was excessive washing of the smear .


Which of the following conditions would introduce a source of error into amanual WBC count


-- -Uneven distribution of leukocytes in the counting chamber


False positive results may occur in the screening solubility test for
hemoglobin S due to


- adding more blood to the reagent than called for by test procedure .


An increase in ****myelocytes , myelocytes , and promyelocytes in the peripheral blood can be referred to as ?


a shift to the left


While performing a WBC differentia count on a capillary blood smear ,no platelets were observed . What action should be taken ?


--- Look at the edge of the smear for platlet clumping
.
A falsely elevated hematocrit is obtained on adefective centrifuge . Which of the following values will not be affected ?



MCH


What effect would the use of abuffer with a PH of 6.0 have on a Wright stained smear ?


--- RBC's would be too pink .


Which of the following red - cell inclusions can be detected with a supravital perparation that uses new methylene -blue Nas the dye reagent but are not visible with Romanowsky stain


--- Heinz bodies


Which of the following contain RNA and are usually identified by staining with brilliant cresyl blue or new methylene blue


--- Reticulocytes .


Astudent cosistently makes peripheral blood smears that are too thin . you instruct the student to try :


--- increasing the angle of the spreader slide


which characteristic differentiates
the myelocyte from other myelocytic cells
--- Appearance of specific granules


vigorous mixing of a whole -blood specimen collected with EDTA results in


a falsely decreased hematocrit---


During the examination of a
cerebrospinal- apecimen from a 45- years old man . the clinical laboratory techinican noted the presence of rare choroid plexus cells in a total WBC count . these results are indictive of ?


--- normal state .




Blood collected for anticoagulation testing should be collected in


--- 3.2% sodium citrate with a 9:1 blood to anticoagulant ratio


ALL of the following conditions may cause an increased thrombin time except?


--- decreased prothrombin


The APTT is a screening test for all
coagulation factors in the intrinsic pathway except which of the following ?


--- X111


the coagulation factor that is decreased in hemophilia A is factor


--- V111


Thawing of platelet - poor plasma that has been stored at -- 40C for coagulation studies should be
performed at what temperature -


- C38- C35


Which two plasma coagulation factors are the least stable in vitro


--- V and V111


A clinical laboratory techncian notes that aspecimen for an APTT has been stored at room temperature for five hours prior to testing . the CLT should :


--- request anew sample .


Plasma is diluted in afibrinogen activity determination to decrease the
--- influence of inhibitors


WHich of the following is appropriate
in preparing an EDTA anticoagulated specimen for analysis when it has been standing in arack and not on a mechanical rotator ?


--- Invert gently at least 60 times .


A patient has an RBC count of 2.70 *10
"12 /L ahemoglobin of 5.5 g/dl , and ahematocrit of 0.19 L/L . what erythrocyte morphology would you expect to see on the periphal blood smear ?


- microcytic hypochromic cells


When reviewing a peripheral blood smear. the clinical labratory scientist notes many macrocytes . the MCV has been reported as 85 FL . This appearent discrepancy may indicate that ?


The smear was made from the wrong
sample


In the performance of amodified Westergren ESR . what is the recommened dilution


--- 1/5 ( volume diluent +4 volumes blood )


many schizocytes are seen on aperiphral blood smear . one of the most common causes for these cells is :


--- microangiopathic anemia


Which of the following procedures is not necessary to confirm the majority of iron realted anemias


Bone marrow evulation


Afalesly elevated G- 6- PD assay using the fluorescent spot test may be seen in patieants with ?


the presence of many reticulocytes


The presence of microorganisms, increased protein and a high leukocyte count in CSF will cause the CSF to appear :
--- cloudy or turbid


In selecting material for smears of bone marrow cell morphology the clinical labratory scientist should select:


--- gray particles floating in blood and fat droplets


Which of the following would be an acceptable specimen for semen analysis
--- Collected at the office without a


condom and eximened in 1 hour


The coagulation factor defiency
that can display both an abnormal PT and APTT is factor


--- X


A patient has an abnormal thrombin time and normal reptilase time .Which of the following can produce this results :


--- Heaparin


The most frequent hereditary condition predisposing to venous thrombosis is


--- activeted protein C resistant


anexpectedly small anticoagulant response to heparin therapy may be caused by decreased levels of :



--- anti thrombin



Un fractionated heparin must have
which one of the following coagulation inhibitors present in normal amounts in order for it to properly anticoagulate a patient :


--- Anti thrombin 111


The formation of D-dimeris the by- product of the effect of plasmin on :


--- across- linked fibrin


In the performance of platelet aggregometry on patient samples the instrument should be set to 100%
transmittance using :


--- patieant platelet - poor plasma (PPP)


Which is the following conditions can cause a prolonged thrombin
clotting time


--- Pro thrombin deficiency


The most common generalized
hemostiatic disorder is :


--- liver disease


Red blood cells morphology characteristic of multiple myeloma
--- Rouleaux


All of the peripheral blood smears made by a certain clinical laboratory technician are too thick . Which of the following corrective actions should be
taken:


--- Lower the angle of the spreader slide to 45 degrees


Which of the following cells may be found only in ascitic fluid


--- Mesothelial cells


The first of 3 tubes of CSF appearspink
and cloudy the remaining 2 tubes appear to be clear and colorless This is indicative of a/an


--- traumatic tap


secondary granules first appear in which stage of neutrophilic development


--- Myelocyte


؟ A supravital stain must be used to demonstrate the presence of


reticulum


An erroneously high spin hematocrit can be caused by


reading the buffy coat as the part of the packed -cell portion
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