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Study Information
Study Attribute Value
CEBS Accession Number: 002-02185-0004-0000-2
Chemical Name: Formaldehyde
CASRN: 50-00-0
NTP Study Type: Genetic Toxicology - Mammalian Cell Cytogenetics
NTP Study ID: 590863_CA
Study Result: Positive

Study Result: Positive
Activation Trial Trial Call
No Activation  1  Weakly Positive 
Induced Rat Liver S9  1_S9  Positive 

Trial #:1   Activation: No Activation    Date: 09/23/1981    Harvest Time: 14 hour(s)   Trial Call: Weakly Positive   
  Dose
µg/mL		 Total
Cells Examined		 Total Aberrations Complex Aberrations Simple Aberrations Other Abs
No. of
Abs		 Abs
Per
Cell		 % Cells
With
Abs		 No. of
Abs.		 Abs
Per
Cell		 % Cells
With
Abs		 No. of
Abs.		 Abs
Per
Cell		 % Cells
With
Abs		 No. of
Abs.		 Abs
Per
Cell		 % Cells
With
Abs
Vehicle Control: Dimethyl Sulfoxide 
0         
 100 1 0.010 1.0 0 0.000 0.0 1 0.010 1.0 0 0.000 0.0
Test Chemical: Formaldehyde 
1.6       
 100 4 0.040 3.0 1 0.010 1.0 3 0.030 2.0 0 0.000 0.0 
5         
 100 7 0.070 7.0 3 0.030 3.0 4 0.040 4.0 0 0.000 0.0 
16         
 100 19 0.190 13.0 12 0.120 9.0 7 0.070 5.0 0 0.000 0.0
Positive Control: Triethylenemelamine 
 0.15      
 100 23 0.230 20.0 7 0.070 6.0 16 0.160 14.0 0 0.000 0.0
Trend: 3.768 3.661 1.834  
Probability: 0.000 0.000 0.033  


Trial #:1_S9   Activation: Induced Rat Liver S9    Date: 09/23/1981    Harvest Time: 14 hour(s)   Trial Call: Positive   
  Dose
µg/mL		 Total
Cells Examined		 Total Aberrations Complex Aberrations Simple Aberrations Other Abs
No. of
Abs		 Abs
Per
Cell		 % Cells
With
Abs		 No. of
Abs.		 Abs
Per
Cell		 % Cells
With
Abs		 No. of
Abs.		 Abs
Per
Cell		 % Cells
With
Abs		 No. of
Abs.		 Abs
Per
Cell		 % Cells
With
Abs
Vehicle Control: Dimethyl Sulfoxide 
0         
 100 1 0.010 1.0 0 0.000 0.0 1 0.010 1.0 0 0.000 0.0
Test Chemical: Formaldehyde 
1.6       
 100 3 0.030 3.0 1 0.010 1.0 2 0.020 2.0 0 0.000 0.0 
5         
 100 5 0.050 5.0 2 0.020 2.0 3 0.030 3.0 0 0.000 0.0 
16         
 100 13 0.130 10.0 10 0.100 9.0 3 0.030 3.0 0 0.000 0.0 
50         
 27 20 0.741 48.0 12 0.444 30.0 8 0.296 22.0 0 0.000 0.0
Positive Control: Cyclophosphamide 
15         
 100 23 0.230 19.0 8 0.080 8.0 15 0.150 14.0 0 0.000 0.0
Trend: 6.198 5.722 3.388  
Probability: 0.000 0.000 0.000