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MOH-ML Technician (MOH Lab Tech) Practice Tests & Test Prep by Exam Edge - Free Test


Our free MOH Medical Laboratory Technician (MOH Lab Tech) Practice Test was created by experienced educators who designed them to align with the official Ministry of Health (Saudi Arabia) content guidelines. They were built to accurately mirror the real exam's structure, coverage of topics, difficulty, and types of questions.

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MOH Medical Laboratory Technician - Free Test Sample Questions

Which of the following is NOT a serological test for syphilis?

Correct Answer:
aso titer


among the listed options, the aso titer is not a serological test for syphilis. instead, it is primarily used to diagnose infections caused by group a streptococcus bacteria, which are responsible for diseases such as strep throat and scarlet fever. the aso (anti-streptolysin o) titer measures the level of antibodies produced against streptolysin o, an enzyme produced by these bacteria.

the other tests mentioned—rapid plasma regain (rpr), fluorescent treponemal antibody absorption test (fta-abs), and treponema pallidum immobilization test (tpi)—are all serological tests used in the diagnosis of syphilis. syphilis is a sexually transmitted infection caused by the bacterium treponema pallidum.

the rpr test is a non-treponemal testing method that detects generic antibodies formed in reaction to lipoidal material released from damaged host cells and possibly from the treponemes themselves. it is commonly used for screening syphilis due to its sensitivity, although it can provide false positives.

the fta-abs test is a treponemal test that specifically detects antibodies to treponema pallidum antigens. it remains positive for life as evidence of exposure and/or infection and is used to confirm the presence of the infection, especially after an rpr or other non-treponemal test has shown positive results.

the tpi test is another treponemal test where live treponema pallidum bacteria are used to determine the presence of antibodies in a patient's serum. this test is less commonly used today but serves a similar purpose in confirming syphilis infection after initial screening tests.

therefore, the correct answer to the question of which test is not a serological test for syphilis is the aso titer, as it is related to streptococcal infections and not syphilis.