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OMSB Midwifery ( Midwifery ) Practice Tests & Test Prep by Exam Edge - Review


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Oman Medical Specialty Board Midwifery - Reviews


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See why our users from 154 countries love us for their exam prep! Including 85 reviews for the OMSB Midwifery 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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Oman Medical Specialty Board Midwifery - Test Reviews Sample Questions

Which of the following statements about placentation in twin pregnancies is least accurate?

Correct Answer:
dizygotic twins may be dichorionic or monochorionic.
to address the question of which statement about placentation in twin pregnancies is least accurate, we need to understand the concepts of monozygotic and dizygotic twins, as well as chorionicity and amnionicity. let's analyze each statement for accuracy:

**statement 1: dizygotic twins may be dichorionic or monochorionic.** - this statement is inaccurate. dizygotic twins, also known as fraternal twins, arise from two separate eggs fertilized by two separate sperm. each zygote (fertilized egg) implants in the uterine wall and develops its own placenta and chorionic sac. therefore, dizygotic twins are always dichorionic, each having their own separate placenta and chorionic sac. they are also always diamniotic, meaning each twin has its own amniotic sac.

**statement 2: dizygotic twins will always be dichorionic. therefore, they will also always be diamniotic.** - this statement is accurate and reflects the correct understanding of placentation in dizygotic twins. as mentioned, because each twin develops from a separate fertilized egg, they always have separate chorionic and amniotic sacs.

**statement 3: monozygotic twins develop from one egg and one sperm.** - this statement is accurate. monozygotic twins, also known as identical twins, develop when a single egg, fertilized by a single sperm, splits into two embryos. the timing of this split affects whether the twins share a placenta (monochorionic) or have separate placentas (dichorionic), and whether they share an amniotic sac (monoamniotic) or have separate sacs (diamniotic).

**statement 4: dizygotic twins develop from two eggs and two sperm. chorionicity is based on when during the early gestational period that the zygote splits.** - the first part of this statement is accurate regarding the origin of dizygotic twins. however, the second part of the statement is incorrect as it applies to monozygotic twins, not dizygotic twins. dizygotic twins do not involve a splitting of the zygote; each twin develops from a separate fertilized egg. chorionicity and amnionicity in dizygotic twins are not influenced by the timing of any split, as no splitting occurs.

**statement 5: monoamniotic/monochorionic chorionicity is rare and increases the risk for perinatal mortality.** - this statement is accurate. monoamniotic/monochorionic twins are a rare form of monozygotic twins where the twins share both the chorionic and amniotic sacs. this situation can lead to complications such as cord entanglement, increasing the risk for perinatal mortality.

**conclusion:** the least accurate statement is **statement 1: "dizygotic twins may be dichorionic or monochorionic."** this statement is incorrect as dizygotic twins are always dichorionic and diamniotic, each twin developing from a separate fertilized egg with its own placenta and amniotic sac.

Anthropomorphic measurements are part of the physical examination of the newborn. Which of the following statements about these measurements is least accurate?

Correct Answer:
chest circumference should be measured under the arms and above the nipple line.


anthropomorphic measurements, which include the assessment of various body dimensions, play a critical role in the physical examination of newborns. these measurements help in evaluating the baby's growth, development, and overall health status. among the standard measurements are the head circumference, chest circumference, and abdominal circumference. each of these measurements must be taken with precision and according to specific guidelines to ensure accuracy and reliability.

the statement that "chest circumference should be measured under the arms and above the nipple line" is identified as the least accurate. the correct method for measuring the chest circumference of a newborn is to place the measuring tape under the arms and across the nipple line, not above it. this technique ensures that the measurement encompasses the largest part of the chest, which is essential for obtaining an accurate indication of the thoracic size and volume.

on the other hand, the head circumference of a newborn is typically larger than the chest circumference at birth. this measurement is taken by wrapping the measuring tape around the largest part of the head, which usually includes the occiput (the back portion of the skull) and the parietal bosses (the widest part of the skull), extending just above the eyebrows. this measurement is crucial as it can indicate potential health issues if the head size is significantly different from the norm for a baby's age and gestational maturity.

other anthropomorphic measurements such as the abdominal circumference, which assesses the size of the abdomen, are also important. the abdomen of a newborn can appear protuberant compared to that of an older child or adult due to physiological factors like the relative size of the liver and laxity of the abdominal wall. additionally, the tone of the newborn is typically flexed, reflecting normal neurological development where the baby maintains a curled-up position.

in summary, when conducting physical examinations of newborns, it is crucial to adhere to the correct procedures for anthropomorphic measurements to ensure that any potential health issues are identified early. the accurate assessment of chest circumference involves measuring across, not above, the nipple line, a guideline that every healthcare professional involved in neonatal care should follow.