Vitamin D3 in breast milk

Here is the math: 1 µg/L D=> 40 IU/L D3 => 2,5 nmol/L D3

The detection limit in breast milk is 0,2 nmol/L = 0,08/µg/L = 3,2 IU/L according to vid Streym who measured a median of 0.34 nmol/L  25-OH-D3 in hind milk which is approx 5,4 IU/L.

Li-Chieh Wang gives no detection limit but measures approx 5 ng/mL = 5.000 ng/L = 5 µg/L = 12,5 nmol/L D3 in breast milk equivalent to 200 IU/L, the 40fold amount to vid Streym.

What is correct?