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Pediatric Serum B12 Reference Ranges

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Hematology Test

Age, years	Male (pg/mL)		Female (pg/mL)
Age, years	Low	High	Low	High
0-1	216	891	168	1117
2-3	195	897	307	892
4-6	181	795	231	1038
7-9	200	863	182	866
10-12	135	803	145	762
13-18	158	638	134	605