Human Phenotype Ontology 
Parent Node:
Abnormality of the cerebrospinal fluid (HP:0002921)help
..Starting node
Low CSF 5-methyltetrahydrofolate (HP:0012446)help
Term ID:12446
Name:Low CSF 5-methyltetrahydrofolate
Definition:A reduced concentration of 5-methyltetrahydrofolate(2-) in the cerebrospinal fluid (CSF). 5-methyltetrahydrofolate is the active folate metabolite.
& Disease (OMIM):
       Child Nodes:

 Sister Nodes: 
..expandAbnormal CSF biopterin level (HP:0040207) help
..expandAbnormal CSF dopamine level (HP:0012654) help
..expandAbnormal CSF lactate level (HP:0030085) help
..expandAbnormal CSF neopterin level (HP:0040203) help
..expandCSF pleocytosis (HP:0012229) help
..expandDecreased CSF homovanillic acid (HVA) (HP:0003785) help
..expandExtra-axial cerebrospinal fluid accumulation (HP:0012510) help
..expandHydrocephalus (HP:0000238) help
..expandHypoglycorrhachia (HP:0011972) help
..expandIncreased CSF interferon alpha (HP:0009709) help
..expandIncreased CSF protein (HP:0002922) help

Human Phenotype Ontology(HPO) is developed by the Human Phenotype Ontology Consortium.