The most important purpose of a requisition form is:
Question options:
Serum calcitonin is normally produced by the C cells of the thyroid. It functions to reduce serum calcium by inhibiting release of calcium from bone. It is a peptide with a molecular weight of 3400, and has a half life of approximately 12 minutes. It is characteristically elevated in medullary carcinoma of the thyroid. Since medullary carcinoma often occurs as an autosomal disorder, family members of patients with this condition should be screened for serum calcitonin.
Serum calcitonin is typically elevated in which of the following conditions:
The correct answer which best fits the characteristics in this question is Mycobacterium kansasii.
The remaining Mycobacterium strains can be elimated as:
Mycobacterium marinum is considered a fast-grower.
Mycobacterium scrofulaceum produce deep-yellow to orange pigmented colonies when grown in the either the light or dark.
Mycobacterium avium grows colonies which are nonpigmented in the light and dark which do not intensify after light exposure.
What is the MOST likely identification of an acid-fast bacillus that demonstrates the following characteristics?
slow growth
cream to tan colored colonies when grown in the dark
development of yellow pigment upon exposure to light
In this case, the pH may become more alkaline, perhaps above 8.0, if the bacteria in the sample are proliferating during the extended room-temperature wait time.
A urine specimen was collected at 6:00 a.m. and remained at room temperature until it was received in the laboratory at 3:30 p.m. How may the pH of the specimen be affected by the extended time at room temperature if bacteria are present in the specimen?
Gluconeogenesis is the formation of glucose from noncarbohydrates when carbohydrate intake is absent, a fasting state. The hormone cortisol along with glucagon and epinephrine all stimulate this metabolic pathway. Insulin; however, inhibits this pathway and is therefore the correct answer.
Which of the following hormones inhibits gluconeogenesis, the formation of glucose from noncarbohydrate sources such as amino acids, glycerol, and fatty acids?
The color coding of evacuated tubes provides information about all of the following except the: Question options:
The division of Department of Health and Human Services (DHHS) responsible for protecting public health by ensuring the safety and efficacy of foods, drugs, biological products, medical devices, and cosmetics is:
In order to perform a venipuncture on a newly admitted hospital patient, a phlebotomist needs to
Although any one of the answers might be considered correct, a report of gram-positive cocci in chains provides sufficient information without going beyond what the observation might allow. In off-the record conversation with the physician, a technologist might divulge that the picture is consistent with Streptococcus; however, enterococci may have a similar Gram stain appearance, potentially leading to the wrong choice of empiric antibiotic agents.
The image shows the Gram stain prepared from the positive blood culture. What is the MOST appropriate report?
The role of the point-of-care testing (POCT) compared with in-laboratory testing is the
Coumarin derivatives inhibit the vitamin K dependent Factors (II, VII, X) which can be measured with the PT and monitored frequently with the INR assay.
Hematology
Warfarin-based (coumarin derivative) oral anti-coagulant therapy is commonly monitored with :
Though automated extraction machines have many benefits over manual methods the costs are high and generally require a high throughput of samples in order to justify the costs.
Automated extraction has many benefits over the traditional manual methods. The most important benefit is that the nucleic acid isolated is constantly consistent. There is a reduced amount of manipulation with dramatically decreases the chance of cross contamination. Also, automated extraction machines are considered moderate complexity and can be performed by a wider variety of laboratory professionals.
All of the following are considered benefits of automated isolation and extraction equipment EXCEPT:
The tube to the left is a slant of esculin medium, the tube to the right contains heart infusion broth with 6.5% sodium chloride. The bacterial species characteristically producing the positive reactions seen in each of these tubes is most likely:
Which of the following is most likely to interact with arterial walls, leading to deposition of cholesterol, and initiating or worsening atherosclerosis?
CAMP is the correct answer because the case is typical of Streptococcus agalactiae(Group B strep). The main presumptive identification test is CAMP. Bile solubility is positive for Streptococcus pneumonia. Coagulase would be positive for Staphylococcus aureus. PYR is positive for Streptococcus pyogenes (Group A strep) which is ruled out by the resistance to bacitracin.
Microbiology
Spinal fluid cultures on a 3-day-old infant revealed beta-hemolytic, Gram-positive cocci occurring in pairs and chains. The organism was catalase-negative and bile esculin-negative. Resistance to 0.04 U disk of bacitracin was noted. The other test necessary to identify this organism is a positive test by:
