Diagnostic Tests Flashcards
What are Maternity Diagnostic Tests ?
- Non-stress test (NST)
- Biophysical Profile test (BPP)
- Contraction stress test (CST)
What do you want to see in a Non-stress test ?
Two or more accelerations of 15 beats/minute (or more) with or without fetal movement
What is Acceleration defined as ?
Acceleration is when the fetal heart rate has an abrupt increase from the baseline.
- this is visualized on the Fetal heart monitor
- The increase is greater than or equal to 15 beats/minute above the baseline and lasts at least 15 seconds, but the HR should come back to baseline within 2 minutes
With a Non-stress test, each increase should last for _______ seconds and recorded for _______ minutes ?
15 seconds
20 minutes
Do you want a Non-stress test to be reactive or non-reactive ?
Reactive (means accelerations present)
- Variability in FHR is good like adults-
What diagnostic test is commonly done in the last trimester ?
Biophysical Profile Test (BPP)
Biophysical Profile Test can also be done when and why ?
At 28 weeks in a high-risk pregnancy
High risk pregnancy’s may have a ________ every week or even twice a week in the 3rd trimester ?
Biophysical Profile Test (BPP)
In a Biophysical Profile Test the measurements are obtained how ?
By ultrasound
Each parameter in a Biophysical Profile Test counts as how many points ?
2 points
a 10/10 is a perfect score
what are Parameters of a Biophysical Profile Test ?
- Heart Rate
- Muscle tone
- Movement
- Breathing
- The amount of Amniotic Fluid around the baby
What is the observation timer a BPP Test ?
30 minutes by Sonogram
How are the results of a BPP Test evaluated ?
- 8-10 = good
- 6 = worrisome (consider repeating the test in 24 hours)
- 4 = ominous (consider immediate delivery)
With a BPP of 6 or lower the PCP may want to do what ?
Deliver the baby
A Contraction Stress Test (CST) is also known as what ?
An Oxytocin Challenge Test
When are Contraction Stress Tests performed ?
On high risk pregnancies, such as…
- Preeclampsia
- Maternal Diabetes
- And any condition which placental insufficiency is suspected
Contraction Stress Test (CST) are generally done if what ?
If Non-stress test (NST) is not reactive
What does a Contraction Stress test (CST) determine ?
Determines if the baby can handle the stress of a uterine contraction
What do uterine contractions do ?
They decrease blood flow to the uterus and the placenta
If blood flow decreases enough to cause hypoxia in the fetus, what will happen ?
The fetal heart rate will decrease from the baseline
(this is called deceleration)
What do you Not want to see in a Contraction Stress Test (CST)
Late decelerations
- this means uteroplacental insufficiency, which means the placenta is wearing out
Do you want a positive or negative Contraction Stress Test (CST) ?
Negative!
means no late decelerations
A Contraction Stress Test (CST) is rarely performed before how many weeks ?
28 weeks
don’t want to result in delivery before 28 weeks
Results of a Contraction Stress Test (CST) are only good for how long ?
One week
What are 3 types of Decelerations ?
- Early decelerations (Not bad)
- Late decelerations (bad)
- Variable decelerations (bad)
What are Early decelerations caused by ?
Benign - and caused by physiological hypoxia from fetal head compression
What are Late Decelerations caused by ?
BAD! - Caused by uteroplacental insufficiency (UPI)
What are Variable Decelerations caused by ?
Bad! - Caused by umbilical cord compression (CC)
