Non-Stress Test (NST)

📌 What is it?

📌 Used to identify Fetal Wellness rather than Illness.

📌 A continuous Electronic Monitoring of the FETAL HEART RATE along with Recording of FETAL MOVEMENTS (Cardiotocography).

📌 There is an observed association of FHR acceleration with fetal movements, which is presumably Reflex mediated.

📌 If Present, it indicates a Healthy Fetus.

📌 Interpretation - 

👉 Reactive (Reassuring) -

〽️ When two or more accelerations of more than 15 beats per minute above the baseline and longer than 15 seconds in duration are present in a 20 minute observation.

👉 Non-reactive (Non-reassuring) -

〽️ Absence of any fetal reactivity. 

📌 A reactive NST is associated with perinatal death of about 5 per 1,000

📌 A Non reactive NST is associated with perinatal death of about 40 per 1,000 

📌 Further evaluation after NST -

📌 Vibroacoustic Stimulation (VAS) is used to change the fetal sleep state from quiet (NREM) to active (REM) sleep. 

📌 A Reactive NST after VAS indicates a Reactive fetus.

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