# Calculate the age and corrected age of prenatal patients

Hi Experts,

I’ve got to calculate the age and corrected age of a selection of prenatal patients from our prenatal department.

The corrected age is the age a child would have if it would have been born after a full pregnancy of 280 day (40 weeks).

What do we know?

We do know the:

•      birth date (stored in a nvarchar field) name “geboortedatum”  format yyyy-mm-dd
•      pregnancy weeks (stored in a nvarchar field)  name “Zwangerschapsduur_weken” format example “27”
•      pregnancy days (stored in a nvarchar field)  name “Zwangerschapsduur_dagen” format example “4”

We need to know (based on the current date):

•      The current uncorrected age (based on the birth date) precise by the day.
•      The corrected age precise by the day.
•      The number of days between the uncorrected and corrected age.

Besides the points you will receive our hospitals gratitude for your contribution to public healthcare in the Netherlands.
peter57r

The number of days difference is just..

280- (Zwangerschapsduur_weken*7) - Zwangerschapsduur_dagen
Swindle

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Hi,

I'm going to write some tips for you that might help:

1. to get current uncorrected age [Select datediff(day, birthdate, getdate()) from ...... ]

2. to get the corrected age:
- get the start pregnancy date = birth_date - pregnancy days in sql ' set @birthdate = dateadd(d, birthdate , -1* pregnancy days)'
- get the estimated_birth_date = start_date + 240 day in sql ' set @estbirth_date = dateadd(d, startdate,240)'
- select @corrected_age = getdate()-estbirth_date

3. just subtract the two dates above.

- To get current date "today" use getdate()

- Date time functions help:http://msdn.microsoft.com/en-us/library/ms186724.aspx