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## Rule Of Four

In Normal adult Iv set 1 ml = 16 drops ( approximately )

In pediatric drip set 1 ml = 64 drops ( approximately )

### According to Rule of Four :

Drop rate     =     No of drops / min

=     Volume ( In ml ) / hr
4
Drop rate     =     Vol. ( ml / hr )
4

### Example : 01

If 160 ml to be infused in 1 hr

Drop rate     =     160 ml
4
40 drops per minute approximately

#### Verify :

160 ml in 1 hr     =     160 ml
60 min

=      2.66 ml in 1 min.

2.66 ml in 1 min     =     2.66 x 16 drops

=     42.56 drops / min.

### Example : 02

If 200ml to be given in 1 hour

Drop rate     =     200
4
=     50 drops per minute.

#### Verify

200 ml in 1 hr     =     200 ml
60 min

3.33 ml in1 min   =     3.33 x 16 drops

=     53.28 drops per min.

### If volume of fluid to be infused for a day is give then

Drop rate     =     Volume ( in ml ) per day
100

Drops / min  =     Volume ( ml/day )
100

### Example :

If 2500ml to be infused in a day then

Drop rate     =     2500ml
100
=     25 drops per minute approximately.

### Verify

2500ml / day     =     2500 ml
24 hr

=     104.16 ml/hr

=      104.16 ml
60 min

=     1.73 ml/min

1.73 ml/min     =     1.73 x 16 drops

=     27.68 drops/min.