Sir hypocalcemia below 9 mg will trigger PTH

Sir hypocalcemia below 9 mg will trigger PTH
Which will go to kidney and resorb ca
For which po4 should decrease?
So indirectly we can say
WHEN CALCIUM decreases PO4 decreases and PARATHYROID increases ?
Sir but i learnt long way back during my mbbs in this form
That PARATHYROID IS (PHOSPHATE THRASHING HORMONE )
So when PTH INCREASES PO4 decreases
And calcium increases

calcium is reabsorbed and phosphate excreted under the influence of PTH
Increase in calcium doesn’t increase pth, increase in pth cause calcium retention by reabsorption … you need to go quickly review your endocrine Physio