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Table 1 Number of birth cohort studies that collected bio-genetic samples at various time periods

From: An inventory of Canadian pregnancy and birth cohort studies: research in progress

Biogenetic sample

Time period; no. (%) of studies

 

n=46

 

1st

2nd

3rd

At

0-6

7-18

19-60

5+

 

Trimester

Trimester

Trimester

Birth

Months

Months

Months

Years

Maternal blood

8

11

9

7

3

4

2

1

 

(17.4%)

(23.9%)

(19.6%)

(15.2%)

(6.5%)

(8.7%)

(4.3%)

(2.2%)

Paternal blood

1

1

1

-

-

-

1

3

 

(2.2%)

(2.2%)

(2.2%)

   

(2.2%)

(6.5%)

Cord blood

-

-

-

14

-

-

-

-

    

(30.4%)

    

Placenta

-

-

-

9

-

-

-

-

 

-

-

-

(19.6%)

-

-

-

-

Umbilical cord

-

-

-

3

-

-

-

-

-

 

-

-

(6.5%)

-

-

-

-

Offspring blood

-

-

-

-

4

2

3

4

     

(8.7%)

(4.3%)

(6.5%)

(8.7%)

Meconium

-

-

-

5

-

-

-

-

    

(10.9%)

    

Breast milk

-

-

-

-

6

-

-

-

     

(13.0%)

   

Maternal urine

5

5

5

2

-

-

-

-

 

(10.9%)

(10.9%)

(10.9%)

(4.3%)

    

Paternal urine

1

-

-

-

-

-

-

-

 

(2.2%)

       

Offspring urine

-

-

-

-

2

1

1

2

     

(4.3%)

(2.2%)

(2.2%)

(4.3%)

Maternal hair

3

2

1

3

2

1

1

-

 

(6.5%)

(4.3%)

(2.2%)

(6.5%)

(4.3%)

(2.2%)

(2.2%)

 

Paternal hair

-

-

-

-

-

1

-

-

-

 

-

-

-

-

(2.2%)

-

-

Offspring hair

-

-

-

1

1

1

1

1

    

(2.2%)

(2.2%)

(2.2%)

(2.2%)

(2.2%)

Maternal saliva

2

1

1

-

2

3

1

1

 

(4.3%)

(2.2%)

(2.2%)

 

(4.3%)

(6.5%)

(2.2%)

(2.2%)

Paternal saliva

-

1

-

-

-

-

1

1

  

(2.2%)

    

(2.2%)

(2.2%)

Offspring saliva

-

-

-

-

1

3

3

2

     

(2.2%)

(6.5%)

(6.5%)

(4.3%)

Maternal nails

-

-

1

-

-

-

-

-

   

(2.2%)

     

Paternal nails

-

-

-

-

-

-

-

-

Offspring nails

-

-

-

-

-

-

-

-

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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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