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Red Cell Folate

My results from a couple of years back shows 728 nmol/L (545-3370)

I've found normal ranges vary greatly on different websites:
776 - 1784 nmol/L
Red cell folate (reference range 360-1400 nmol/L)
158 - 1099 nmol/L

Using my lab it would be within range, low on the first one above and sufficient on the last one.