hello, i have a 3.4 thyroid nodule which is being monitored. Last fall, i had my pth level done which was borderline high. i just took a calcium blood test and my ca is 10.7. i'm wondering if this is hyperparathyroidism. i had this condition in 1991 which i had surgery to remove one parathyroid gland with adenoma on it. can this happen again. does my thyroid nodule have anything to do with this. i am taking vit d3 1000 mg daily for low vit d level which i started last fall. vit d level still low but higher than it was. thank you for any help you can all give me.