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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 - - - - - - - -