Table 2: Reference intervals for 5-MTHF with 90% confidence intervals for lower and upper 95% reference limits.

AnalyteReference intervalsLower reference limitUpper reference limit

Plasma 5-MTHF (nmol/L)6.6–39.95.3–8.936.9–41.7
Redcell 5-MTHF (nmol/L)223–1040206–291930–1110
Whole blood 5-MTHF (nmol/L)245–1102224–311969–1184