Fetal Non-Stress Test│What To Expect


hi i'm dr. wendy wagner and i'd like to

do a brief overview of an sts or

non-stress test basically this is

something that normally gets done at the

end of pregnancy usually gets done at

the end of pregnancy for issues such as

decreased fetal movement high blood

pressure diabetes etc it's a test that

looks at the health of the baby in utero

and I'll just give a general overview of

how it's set up and what it looks like

and what the meaning of the results are

this is the NSP machine it's off right

now but there are two of these trans

transducers that get attached one is the

toko and this is what measures the

contractions and the activity of the

uterus the other one is an ultrasound

very similar to the Doppler and this is

what measures the baby's heart rate so

when you get the non-stress test you lie

down here there are two belts that go

around one gets the heart rate of the

baby on your belly the other one is up

higher and checks the activity of the

uterus usually stay on here for about

twenty to thirty minutes depending on

what we call the reactivity of the baby

when you look at the screen the baby's

heart rate will be up top and the

uterine activity will be below and right

now I'll show you some strips that we

get some results from the non-stress

test so the result from the what we call

the strip or the non stress test is a

baby's heart rate above and the uterine

activity below

you don't activity below so the top part

what we're looking for is not a flatline

so we're looking at what we call

reactivity basically that the baby's

heart rate is having some Rises like

this and we actually measure those rises

and they need to meet certain criteria

in order for the strip to be reactive

meaning the baby is healthy

and can you know withstand some stress

the bottom of the strip this is the

baseline so when the uterus is relaxed

and when you get a contraction it goes

like this now interestingly you may look

at this and say well this contraction is

stronger than this contraction however

the the toko or the piece of the

non-stress test that is measuring the

uterine activity is not measuring the

exact strength

it's just measuring why the contractions

are so in other words if the belt was

tighter and the toko is pressed closer

to the belly these would look higher so

it doesn't actually measure the strength

that just measures the timing of the

contractions so in general if you are

getting a non-stress test you're gonna

be put on the machine and your physician

and Ridd wife is going to take a look

and make sure that you have a reactive

strip and you're not having regular

contractions depending on why you're

getting monitored or how you're going to

monitor these non-stress test may be

part of a what we call bi-weekly fetal

surveillance which means one non-stress

test in one biophysical which we'll talk

about later it's an ultrasound so you'll

get two times a week you'll get one

strip and one ultrasound and that's how

we will monitor how your baby is doing