"Requirements" for a triphasic chart?

Brittny

Hello ladies, does anyone know what the requirements are to have your chart considered triphasic?

I know you need the second shift mid way through the luthel phase, but does it have to be to a certain degree or stay elavated for 3 days like ovulation?

My temp had a little spike this morning and I'm wondering if it stays around this new temp or continues to go higher if it will be considered triphasic?