Ammonium biurate crystalsare typically round, irregularly spiked and yellow-brown in color.
A microscopic examination of a normal urine pH 8.0 shows 2+ yellow-brown thorny spheres which are MOST probably:
A. ammonium biurate crystalsHb S migrates with D in alkaline and alone in acid electrophoresis.
The gel electrophoresis pattern for hemoglobin S shows which of the following migration patterns?
A. Hb S migrates alone in alkaline and D in acid electrophoresis.Microbiology
Matching: The detection of a distinct odor is often helpful in the presumptive identification of bacterial culture isolates. Match each of the odors listed with its corresponding bacterial species name.
1.
Streptococcus anginosus (milleri)
2.
Pseudomonas aeruginosa
3.
Eikenella corrodens
4.
Alcaligenes faecalis
A. Pared applesA. Aspergillus fumigatus
B. Blastomyces dermatitidis
C. Coccidioides immitis
D. Cryptococcus neoformans
E. Histoplasma capsulatum
The ratio of blood to anticoagulant in a light blue stopper tube is:
A. 10:1L/S ratio <2.0 indicates an increased risk of respiratory distress syndrome (RDS) at delivery. L/S ratio <1.5 indicates a very high risk of developing RDS.
Which of the following statements regarding the L/S ratio is TRUE?
The correct answer is highlighted below
A ratio of 2:1 or greater usually indicates adequate pulmonary surfactant to prevent respiratory distress syndrome (RDS)
A ratio of 1.5:1 indicates fetal lung maturity in pregnancies associated with diabetes mellitus.
Sphingomyelin levels increase during the 3rd trimester causing the L/S ratio to fall slightly during the last two weeks of gestation.
A phosphatidylglycerol (PG) spot indicates the presence of meconium in the amniotic fluid Lecithin is in direct ratio with sphingomyelin
Heparin contamination is characterized by an elevation in the aPTT test and can also cause an increased PT test as well. Reptilase time tests are used to elimate the effects of heparin contamination as the reagents and method are resistant
to the effects of antithrombin III, unlike the PT and aPTT tests. Therefore, it would be expected that a patient sample containing pre-analytical heparin contamination will show an increased aPTT (and sometimes PT as well) while showing a
normal reptilase time.
A specimen drawn from an indwelling catheter that was contaminated by heparin would be indicated by:
A. normal PT and aPTT resultsG6PD deficiency causes an increased suseptibility to the oxidation of hemoglobin, which in turn, causes the precipitation of hemoglobin inside of the red blood cell. Which one of the following conditions is associated with glucose-6-phosphate dehydrogenase (G6PD) deficiency?
A. Microcytic red cellsWhich of the following fields is NOT an aspect of clinical microbiology?
A. virologyAHG must be added to the cells immediately following washing. Antibodies may elute from the cells if the cells are allowed to sit in saline without the addition of AHG. Which one of the following may cause a FALSE-NEGATIVE result with antiglobulin techniques?
A. Red cell/AHG test sample is over-centrifugedLaboratories performing which of the following types of tests need to be enrolled in a CLIA- approved proficiency testing program?
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