Physiological Changes in Pregnancy
This hormone maintains the uterine lining and prevents uterine contractions in early pregnancy.
What is progesterone?
Rationale:
Progesterone supports implantation, maintains the endometrium, and relaxes smooth muscle to prevent preterm contractions.
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This pregnancy-related condition describes dilution of red blood cells due to increased plasma volume.
What is physiologic anemia of pregnancy?
Rationale:
Plasma volume increases more than RBC mass, causing lower hemoglobin/hematocrit values.
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This first-trimester blood test screens for chromosomal abnormalities using maternal serum markers.
What is cell-free fetal DNA testing (NIPT)?
Rationale:
NIPT analyzes fetal DNA in maternal blood to assess risk for trisomies 21, 18, and 13.
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This test evaluates fetal heart rate response to movement.
What is the Nonstress Test (NST)?
Rationale:
A reactive NST reflects adequate oxygenation and neurologic function.
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A pregnant patient at 10 weeks reports nausea, fatigue, breast tenderness, and frequent urination.
What are normal presumptive signs of pregnancy?
Rationale:
These symptoms are commonly caused by rising hCG, estrogen, and progesterone in early pregnancy.
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This cardiovascular change causes a normal decrease in blood pressure during the second trimester.
What is systemic vasodilation with increased blood volume?
Rationale:
Peripheral vasodilation and increased plasma volume lead to a physiologic drop in BP, especially mid-pregnancy.
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This renal change causes increased urinary frequency during pregnancy.
What is increased glomerular filtration rate (GFR)?
Rationale:
Renal blood flow and GFR increase, leading to more urine production.
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This test, performed at 24–28 weeks, screens for gestational diabetes.
What is the 1-hour oral glucose challenge test?
Rationale:
Assesses placental-induced insulin resistance common in mid-pregnancy.
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This ultrasound-based test includes fetal breathing, tone, movement, and amniotic fluid volume.
What is the Biophysical Profile (BPP)?
Rationale:
Combines NST and ultrasound findings to evaluate fetal well-being.
Nursing Actions:
A patient at 26 weeks has no symptoms but is scheduled to drink a glucose solution and have blood drawn 1 hour later.
What is the 1-hour oral glucose challenge test?
Rationale:
This screening test assesses for gestational diabetes during the period of peak insulin resistance.
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This respiratory change improves oxygen delivery to the fetus.
What is increased tidal volume and oxygen consumption?
Rationale:
Pregnancy increases maternal oxygen needs by ~20%; deeper breaths enhance maternal-fetal oxygen exchange.
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This condition may occur when the gravid uterus compresses the vena cava while supine.
What is supine hypotensive syndrome?
Rationale:
Compression decreases venous return and cardiac output, causing hypotension and dizziness.
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This first-trimester diagnostic test obtains placental tissue to detect genetic abnormalities but does not assess neural tube defects.
What is Chorionic Villus Sampling (CVS)?
Rationale:
CVS involves sampling chorionic villi from the placenta between 10–13 weeks gestation to diagnose chromosomal and genetic disorders (e.g., trisomies, single-gene disorders). Because CVS does not sample amniotic fluid, it cannot measure alpha-fetoprotein (AFP) and therefore cannot detect open neural tube defects.
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Oligohydramnios is defined as this condition.
What is low amniotic fluid volume?
Rationale:
Can indicate placental insufficiency or fetal renal issues.
Nursing Actions:
Second-trimester screening reveals elevated maternal serum AFP levels.
What are possible open neural tube defects?
Rationale:
Increased AFP may indicate defects such as spina bifida or anencephaly due to fetal protein leakage.
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The uterine growth out of the pelvis typically occurs at this gestational age.
What is 12 weeks gestation?
Rationale:
By 12 weeks, the uterus becomes an abdominal organ, which helps relieve early urinary frequency.
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Leukocytosis in pregnancy is considered normal due to this physiologic reason.
What is immune system adaptation to pregnancy?
Rationale:
WBC levels normally increase as part of pregnancy-related inflammatory and immune adaptations.
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This diagnostic antepartal test carries a small risk of miscarriage.
What is amniocentesis?
Rationale:
Amniotic fluid sampling provides definitive genetic information but is invasive.
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This Doppler study is used in high-risk pregnancies to assess placental blood flow.
What is umbilical artery Doppler velocimetry?
Rationale:
Abnormal flow indicates compromised placental perfusion.
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A pregnant patient at 34 weeks reports decreased fetal movement. The provider orders external fetal monitoring without contractions.
What is a Nonstress Test (NST)?
Rationale:
An NST evaluates fetal heart rate accelerations in response to movement to assess oxygenation and neurologic function.
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This endocrine-mediated change explains why pregnant patients may experience nasal congestion, epistaxis, and gingival bleeding.
What is estrogen-related mucosal hyperemia and increased capillary fragility?
Rationale:
Elevated estrogen increases vascularity and capillary permeability of mucous membranes, affecting the nasal passages and gums.
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This specific coagulation change during pregnancy increases the risk for thromboembolic events.
What is pregnancy-induced hypercoagulability due to increased clotting factors and fibrinogen?
Rationale:
Pregnancy increases clotting factors VII, VIII, IX, X, and fibrinogen to protect against hemorrhage at delivery, but raises DVT risk.
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This abnormal maternal serum AFP result is most closely associated with open fetal neural tube defects.
What is elevated maternal serum alpha-fetoprotein (MSAFP)?
Rationale:
AFP leaks into maternal blood when fetal neural tube or abdominal wall defects are present.
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During a contraction stress test, this fetal heart rate response indicates uteroplacental insufficiency.
What are late decelerations?
Rationale:
Late decelerations occur after the peak of contractions and signal impaired placental oxygen transfer.
Nursing Actions & Interventions:
A 38-year-old pregnant patient at 11 weeks desires definitive genetic information. Placental tissue is sampled, but neural tube defects cannot be detected.
What is Chorionic Villus Sampling (CVS)?
Rationale:
CVS is a first-trimester diagnostic test used to detect chromosomal abnormalities, but it cannot assess AFP levels.
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