Question:easy
In a non-stress test (NST), all of the following are assessed except?
In a non-stress test (NST), all of the following are assessed except?
Show Hint
Oxytocin provokes contractions - that belongs to the CST, not the NST.
Updated On: Jun 24, 2026
- Variability
- Acceleration
- Time period
- Oxytocin
Show Solution
The Correct Option is D
Solution and Explanation
Step 1: Define the test and its purpose. The NST is an antepartum surveillance tool used to confirm that the fetus is well oxygenated. An intact autonomic nervous system in a healthy fetus produces transient rises in heart rate when the baby moves, and the NST captures exactly this response on a cardiotocograph strip.
Step 2: List the genuine NST parameters. When reading the strip the clinician notes the baseline FHR, the moment-to-moment variability, accelerations linked to fetal kicks, and the duration over which these are watched (the time period). All three answer choices of variability, acceleration, and time period are therefore legitimate features that the NST examines.
Step 3: Separate NST from the contraction-based test. Oxytocin is administered only when a contraction stress test is intended, because its job is to induce uterine contractions and reveal late decelerations from placental insufficiency. Since oxytocin belongs to the CST and never to the NST, it is the parameter that is NOT seen in an NST.
\[\boxed{\text{Oxytocin (option 4)}}\]
Step 2: List the genuine NST parameters. When reading the strip the clinician notes the baseline FHR, the moment-to-moment variability, accelerations linked to fetal kicks, and the duration over which these are watched (the time period). All three answer choices of variability, acceleration, and time period are therefore legitimate features that the NST examines.
Step 3: Separate NST from the contraction-based test. Oxytocin is administered only when a contraction stress test is intended, because its job is to induce uterine contractions and reveal late decelerations from placental insufficiency. Since oxytocin belongs to the CST and never to the NST, it is the parameter that is NOT seen in an NST.
\[\boxed{\text{Oxytocin (option 4)}}\]
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