Table 1.

Summary of metabolic findings in patient MT (Asperger’s) and PL (PDD-NOS)

Patient	Age (years)	5HIAA (nmol/L)	HVA (nmol/L)	HVA/5HIAA (ratio)	Serotonin
					Blood (ng/mL)	Platelets (ng/×10 9 )
MT	9.6	64.7	389.6	6.0	287	1041
PL	6.2	73.6	399.8	5.4	221	675
Ref*	5–10*	133 (88–178)*	523 (144–801)*	1.5–3.5*	50–220**	125–500**

HVA, homovanillic acid; 5HIAA, 5-hydroxyindolacetic acid (serotonin end-metabolite).

*Reference values and ranges see ref. [33].

**Reference values see ref. [34].