Features of CTG

ReassuringNon ReassuringAbnormal
BASELINE ( bpm) 110 TO 160 100 to 109
161 to 180		Less than 100
More than 180
VARIABILITY ( bpm) 5 to 25 Less than 5 for 30 to 50 min
OR
More than 25 for 15 to 25 minutes		– Less than 5 for
more than 50 minutes 

OR 
– More than 25 for
more than 25 minutes 
OR  
– Sinusoidal 
DECELERATIONSNone or early.
Variable decelerations with no concerning characteristics for less than 90 minutes		Variable decelerations with no concerning characteristics for 90 minutes or more 
OR  
Variable decelerations with
any concerning characteristics in up to 50% of contractions for 30 minutes or more 

OR  
Variable decelerations with
any concerning characteristics
in over 50% of contractions for LESS than 30 minutes 
OR 
Late decelerations in
over 50% of contractions for less than 30 minutes, with no maternal or fetal clinical risk factors such as vaginal bleeding or significant meconium 
Variable decelerations with
any concerning characteristics
in over 50% of contractions for 30 minutes
OR
Variable decelerations with
any concerning characteristics
in over 50% of contractions for
less than 30 min if any maternal or fetal clinical risk factors.

OR 

Late decelerations for 30 minutes

OR
Late decelerations for less than 30 minutes
if any maternal or fetal clinical risk factors  
OR  

Acute bradycardia, or a single prolonged deceleration lasting 3 minutes or more 
Rethink- 

- Variable decelerations with no concerning characteristics are 
1. Reassuring for 90 min
2. At and beyond 90 min, they become a non-reassuring feature. 


- Variable decelerations with concerning characteristics- 
( Think about- a. Clinical risk factor(s), b. whether the decelerations have bee present for less than or more than 50% contractions, c.  Duration- Less than or more than 30 min) 

1.If with less than 50 % contractions, they are Non reassuring till 30 minutes OR MORE !

2. Without maternal/fetal clinical risk factors ( The DR in DR C BRAVADO) 
-If with MORE than 50 % contractions, they are non reassuring till LESS than 30 minutes. If the same continues for 30 min or more-  they become an 'Abnormal' feature. 

3. With maternal or fetal clinical risk factors-  then they are considered ABNORMAL if present in MORE than 50 % contractions for less than 30 minutes. 



- Late decelerations
1. With No maternal or fetal clinical risk factors- They are non reassuring at MORE THAN 50 % Contractions, for less than 30 min. 
At 30 min or beyond, all Late decelerations ( regardless of relationship to contractions) - are ABNORMAL. 

2. With maternal or fetal clinical risk factors- 
    - Any late deceleration is deemed ABNORMAL. 
   
 Click below

Useful link- https://www.frimleyhealthandcare.org.uk/media/1780/fetal-monitoring-including-fetal-blood-sampling-v21-6-may-2020.pdf

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