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DHA Phlebotomist (DHA-Phleb) Practice Tests & Test Prep - Review


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DHA Phlebotomist - Reviews


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See why our users from 154 countries love us for their exam prep! Including 85 reviews for the DHA Phlebotomist exam.

Exam Edge is an industry leader in online test prep. We work with institutional partners to offer a wide array of practice tests that will help you prepare for your big exam. No matter how niche your field of interest might be, we're here to help you prepare for test day.

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DHA Phlebotomist - Test Reviews Sample Questions

The two-step method for glucose testing for gestational diabetes requires the patient to receive two tests. Which of the following statement about this testing is least accurate?

Correct Answer:
the second test requires only one collection of blood.
the two-step method for glucose testing for gestational diabetes involves sequential testing to evaluate how well a pregnant woman's body processes sugar. this method aims to identify gestational diabetes, a condition that can develop during pregnancy. the process is divided into two distinct tests, typically administered on separate days.

the first test in this method is the glucose challenge test (gct). during this initial step, the patient is given a glucose solution containing 50 grams of glucose to drink, and her blood sugar level is measured one hour later. this test does not require fasting beforehand. if the blood sugar level from this test is above a certain threshold, it indicates the need for further testing but does not alone diagnose gestational diabetes.

the second test, known as the glucose tolerance test (gtt), is more comprehensive and is only administered if the results from the gct warrant it. this test typically occurs on a different day than the gct. it requires the patient to fast overnight. on the day of the test, the fasting blood sugar level is measured. then, the patient consumes a glucose solution, this time containing a higher concentration of glucose (usually 100 grams). blood sugar levels are then measured multiple times over a period of 2 to 3 hours, typically at one-hour intervals. this procedure assesses how efficiently the body processes glucose over a longer period.

the statement "the second test requires only one collection of blood" is incorrect or the least accurate concerning the two-step glucose testing method for gestational diabetes. in the gtt, multiple blood samples are necessary to accurately assess the body's response to the glucose intake over time. each collection provides vital information on how quickly and effectively the patient's body is able to return her blood sugar levels to normal, which is crucial for diagnosing gestational diabetes.

understanding the importance of multiple blood collections in the gtt is key to recognizing gestational diabetes and managing it appropriately. each blood sample helps to map out the glucose curve and identify abnormalities in glucose metabolism, which are critical for ensuring both maternal and fetal health during pregnancy.

Cold Chain Preservation is used to:

Correct Answer:
keep and distribute blood specimens that are in good condition.


cold chain preservation is a critical process used in maintaining the quality and integrity of biological samples, such as blood specimens, during storage and transportation. this method ensures that the specimens are kept at a specific, controlled temperature from the point of collection until they are processed or analyzed in the laboratory. the primary purpose of cold chain preservation is to prevent any biological, chemical, or physical changes that could degrade the samples and affect the accuracy of test results.

implementing cold chain preservation involves using specialized equipment such as refrigerated containers, cool boxes, ice packs, and temperature-controlled vehicles. the equipment used is designed to maintain a constant temperature despite external temperature fluctuations which may occur during transportation or storage. this is crucial for blood specimens which must be stored within a narrow temperature range to preserve the integrity of the blood cells and plasma.

in the context of blood specimen handling, cold chain preservation does not involve adding ice directly to the samples. instead, ice or other cooling agents are utilized within the transport or storage containers to maintain the necessary ambient temperature. direct contact with ice could potentially cause freezing and damage to the blood cells, thereby rendering the samples unusable for laboratory tests.

furthermore, cold chain preservation is not typically used for keeping samples in a frozen state for up to 5 years. while freezing can be used for long-term storage of certain biological samples, it requires specific cryopreservation techniques and equipment different from those used in standard cold chain systems. these techniques ensure the samples are frozen and thawed without causing ice crystal formation and cellular damage.

lastly, cold chain systems do not facilitate the reuse of samples. the purpose of maintaining a cold chain is to preserve the original condition of the samples until their first and final use in testing. once blood specimens are thawed and tested, they cannot be refrozen or reused as this would compromise the validity of any subsequent test results and could potentially pose safety risks.

in summary, cold chain preservation is essential for ensuring that blood specimens remain stable and reliable for accurate diagnostic and research purposes. this system is carefully designed to meet the specific temperature requirements of the specimens, thereby limiting any risk of degradation during transport or storage.