Demerits of diagnostic test
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The purpose of administering diagnostic tests is to try to determine what students already know about the concepts and skills to be covered by instruction. the major disadvantage is when certain questions are asked to the students to relatively dull students and they cannot answer.
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disadvantages of current diagnostic tests for the detection of Helicobacter pylori. ... The PCR test has similar sensitivity and specificity to histological and culture tests but a strict protocol must be followed to avoid contamination with H. pylori DNA.
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