Some questions in R

I have two data frames, part of the first data frame BMIis:

Study_No  Visit_Date  Height  Weight BMI  KCLfamid outlier year
1       21 2005-05-17  161.0   66.7 25.73        2       0 2005
2       21 1992-06-12  165.0   60.3 22.15        2       0 1992
3       21 2013-05-29  159.0   61.4 24.29        2       0 2013
4       21 2008-07-08  160.5   64.6 25.08        2       0 2008
5       22 1992-06-12  170.0   76.0 26.30        2       0 1992
6       22 2005-05-17  164.0   77.0 28.63        2       0 2005

and the second data frame info822 is:

SampleID KCLfam KCLid DNAextraction  DATE_BORN Batch1      plate position
1      21     13   131     2008-11-13 1952-07-25      2 6929806013   R03C01
2      132     13   132    2008-11-13 1952-07-25      2 6929806013   R04C01
3      201     20   201    2006-06-30 1941-01-03      1 6057825005   R05C01
4      202     20   202    2006-06-30 1941-01-04      1 6042308068   R03C02
5      241     24   241    2006-06-30 1925-08-06      1 6057825046   R02C02
6      261     26   261    2005-05-27 1938-11-06      2 6929806023   R05C01

I want to add an new columnDNAextraction inBMI. When the numbers in BMI$Study_No also appear in info822$SampleID , BMI$DNAextraction==info822$DNAextraction, or BMI$DNAextraction=="NA"

So the result what I want to get is like:

Study_No Visit_Date Height Weight   BMI KCLfamid outlier year DNAextraction
1       21 2005-05-17  161.0   66.7 25.73        2       0 2005   2008-11-13       
2       21 1992-06-12  165.0   60.3 22.15        2       0 1992   2008-11-13
3       21 2013-05-29  159.0   61.4 24.29        2       0 2013   2008-11-13
4       21 2008-07-08  160.5   64.6 25.08        2       0 2008   2008-11-13
5       22 1992-06-12  170.0   76.0 26.30        2       0 1992   NA
6       22 2005-05-17  164.0   77.0 28.63        2       0 2005   NA

Is it correct that use for loop and if/else statement to answer this question?