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Test ID: FGCU    
Guanidinoacetic acid + creatine, Urine

Reference Values Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.

Creatine/Creatinine ratio

Normal Range:                     

        <4y: 0.01 - 1.19 (SD), N=51       

     4-12y: 0.01 - 1.51 (SD), N=41       

      >12y: 0.01 - 0.40 (SD), N=43

            

 Affected Range:

     X-linked creatine transporter deficiency:

       range = 2.0 - 4.8, n=6

                

Guanidinoacetate  

Normal Range:                        

        <4y:     9 - 200 mmol/mol creatinine, N = 51

     4-12y:    12 - 127 mmol/mol creatinine, N = 41

      >12y:     8 -   68 mmol/mol creatinine, N = 43

                 

Affected Range:

     guanidinoacetate methyltransferase deficiency: 458 - 777, n = 3

     arginine: glycine amidinotransferase deficiency: <1, n = 2

 

Test Performed by: Kennedy Krieger Institute

                             707 North Broadway

                             Baltimore, MD 21205